Download dr. arvind`s biology classes

1
DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
HUMAN REPRODUCTION
1. Which one is a primary sex organ?
a) Penis
b) Testis
c) Prostate
d) Scrotum
Ans. (b)
2. Which of the following is secondary sex organ?
a) Beard
b) Uterus
c) Ovary
d) Broad hips
Ans. (b)
3. An accessory sex character is :
a) fallopian tubes
b) beard
c) pituitary
d) ovary
Ans. (b)
4. Scrotal sacs are connected with abdominal cavity
by:
a) Epididymis
b) Spermatic canal
c) Inguinal canal
d) Haversian canal
Ans. (c)
5. In many mammals, testes remain outside
body cavity in scrotal sacs because:
a) It helps in coitus
b) It helps in ejection of semen
c) sperms produced in it are more active.
d) spermatogenesis occurs at a temperature
lower than that of body.
Ans. (d)
6. In which of the following organisms testes
descends into scrotum in breeding season
but in non-breeding season goes up?
a) Bat
b) Frog
c) Whale
d) Seal
Ans. (a)
7. In mammals, failure of testes to descend
into the scrotum is known as :
a) castration
b) impotency
c) paedogenesis
d) cryptorchidism
Ans. (d)
8. Gubernaculum is the ligamentous connective
cord which connects:
a) testis to kidney
b) testis to scrotum
c) ovary to abdominal wall
d) muscle to muscle
Ans. (b)
9. Mesorchium refers to:
a) capsule in testis
b) capsule in ovary
c) a peritoneal fold that covers testis
d) a peritoneal fold that connects ovary
and kidney
Ans. (c)
10. The tunica albuginea is a covering around
the:
a) testes
b) kidneys
c) uterus
Ans. (a)
d) epididymis
11. Sperms are produced in :
a) vas deferens
b) epididymis
c) interstitial cells
d) seminiferous tubules
Ans. (d)
12. Which of the following is found in the
interstitial connective tissue of testis?
a) Sertoli cells
b) Sustencular cells
c) Leydig cells
d) Germ cells
Ans. (c)
13. Leydig cells produce:
a) sperms
b) testosterone
c) progesterone
d) corticosterone
Ans. (b)
14. Testosterone is a/an:
a) steroid
b) protein
c) octapeptide
d) glycoprotein
Ans. (a)
15. The primary regulator of Leydig cell secretion is:
a) FSH releasing factor
b) Androgen-binding protein
c) Luteinizing hormone (LH)
d) Follicle stimulating hormone
Ans. (c)
16. Supporting cells found in between the
germinal epithelium of testis are called:
a) Phagocytes
b) Sertoli cells
c) Leydig cells
d) Granular cells
Ans. (b)
17. In the vertebrate testes, for nourishment
during spermiogenesis, the spermatids get
attached to:
a) Sertoli cells
b) Spermatocytes
c) Interstitial cells
d) Sperm-mother cells
Ans. (a)
18. Sertoli cells are found in testis. These cells
are:
a) nurse cells
b) reproductive cells
c) receptor cells
d) none of these
Ans. (a)
19. Which of the following controls the function
of Sertoli cells?
a) FSH
b) ICSH
c) Oestrogen
d) Testosterone
Ans. (a)
20. Rete testis opens to:
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DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
a) Urethra
b) Vasa efferentia
c) Bidder’s canal
d) Cauda epididymis
Ans. (b)
21. The head of epididymis is called:
a) vas deferens
b) gubernaculum
c) caput epididymis
d) cauda epididymis
Ans. (c)
22. Cauda epididymis leads to:
a) rete testis
b) vas efferens
c) vas deferens
d) ejaculatory duct
Ans. (c)
23. The main function of vas deferens is to:
a) store the sperms
b) mature the sperms
c) conduct the sperms
d) none of these
Ans. (c)
24. Major part of semen is secreted by:
a) Seminal vesicle
b) Prostate gland
c) Cowper’s gland
d) Bartholin’s gland
Ans. (a)
25. The common duct formed by the union
of vas deferens and duct from seminal
vesicle is:
a) Urethra
b) Stenson’s duct
c) Spermatic duct
d) Ejaculatory duct
Ans. (d)
26. Which gland in mammal makes alkaline
secretion for lubrication?
a) Testis
b) Pineal body
c) Cervical glands
d) Cowper’s gland
Ans. (d)
27. In rabbit, the acidity in the urethra is
neutralized by the secretions of:
a) cowper’s glands
b) Bartholin glands
c) perineal glands
d) Leydig cells
Ans. (a)
28. The skin covering the glans penis is called:
a) Prepuce
b) Epididymis
c) corpora cavernosa
d) corpus spongiosum
Ans. (a)
29. Corpora cavernosa are found in:
a) testis
b) ovary
c) penis
d) uterus
Ans. (c)
30. Seminal plasma contains the secretions of:
a) Follicles, uterus and prostate gland
b) Prostate, Cowper’s and Bartholin’s gland
c) Seminal vesicle, uterus and prostate gland
d) Seminal vesicle, prostate and Cowper’s
gland
Ans. (d)
31. Which one is unpaired gland in male
reproductive system?
a) Seminal vesicle
b) Cowper’s gland
c) Prostate gland
d) Lacrimal gland
Ans. (c)
32. Prostate gland is a:
a) Digestive gland
b) Sperm producing gland
c) Hormone producing gland of males
d) Semen secreting accessory gland of
male
Ans. (d)
33. Which of the following sugars in semen is a
source of energy for the spermatozoa?
a) Sucrose
b) Fructose
c) Glucose
d) Galactose
Ans. (b)
34. Sugar fructose is present in the secretion of:
a) seminal vesicles
b) Cowper’s gland
c) Perineal gland
d) Bartholin’s gland
Ans. (a)
35. Semen contains all of the following except:
a) Mucus
b) Fructose
c) Substances to reduce the pH of the
vaginal environment
d) Substances to increase the motility of
the uterine muscles
Ans. (c)
36. At what speed a human sperm moves in
the female genital tract?
a) 3 mm/min
b) 10 mm/min
c) 15 mm/min
d) 20 mm/min
Ans. (a)
37. Match the following:
Set I
Set II
A Inguinal canal
1. Network of channels
after
seminiferous
tubules
B Rete testis
2. Secondary
sexual
characters
C Leydig cells
3. For descending of
testis
D Prepuce
4. Dorsal bundles of
spongy tissue
E Corpora
5. Terminal skin of penis
cavernosa
Answer codes:
a) A = 1, B = 2, C = 3, D = 5, E = 4
b) A = 3, B = 1, C = 4, D = 2, E = 5
c) A = 2, B = 4, C = 3, D = 5, E = 1
d) A = 3, B = 1, C = 2, D = 5, E = 4
Ans. (d)
38.
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DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
a) A-oviduct, B-uterus, C-outduct, D-ovary
b) A-cervix, B-uterus, C-ovary, D-tumour
c) A-uterus, B-uterine cavity, C-oviducal
funnel, D-ovary
d) A-cervix, B-uterus cavity, C-fallopian
tube, D-ovary
Ans. (d)
39. In a Graafian follicle :
a) eggs are fertilized
b) there are many oocytes
c) there are many sperms
d) there is a single oocyte
Ans. (d)
40. Cumulus covers:
a) ovum
b) ovary
c) embryo
d) all of these
Ans. (a)
41. Antrum is the cavity of:
a) Ovary
b) Blastula
c) Gastrula
d) Graafian follicle
Ans. (d)
42. A glycoprotein non-cellular membrane which
normally surrounds the ovum of a mammal:
a) corona radiata b) jelly envelope
c) zona pellucida d) granulosa membrane
Ans. (c)
43. Ovulation occurs under the influence of:
a) LH
b) Estrogens
c) FSH
d) Progesterone
Ans. (a)
44. Which one holds corona radiata cells
together?
a) Lipoprotein
b) Liposaccharide
c) Oligosaccharide
d) Mucopolysaccharide
Ans. (d)
45. Which is the correct sequence of layers in the
mammalian egg from outside to inside?
a) Zona pellucida, corona radiata, plasma
membrane
b) Corona radiata, zona pellucida, plasma
membrane
c) Plasma membrane, zona pellucida,
corona radiata
d) None of the above
Ans. (b)
46. When is progesterone mainly secreted?
a) After ovulation
b) After parturition
c) Before ovulation
d) At the time of parturition
Ans. (a)
47. The mammalian corpus luteum produces:
a) FSH
b) progesterone
c) luteinizing hormone d) HCG
Ans. (b)
48. Which of the following statements is
correct?
a) Corpus luteum changes into corpus
albicans
b) Corpus luteum degenerates after
fertilization
c) Corpus luteum grows throughout the
pregnancy
d) Corps luteum is not formed during the
pregnancy
Ans. (a)
49. Both corpus luteum and macula lutea are:
a) a source of hormones
b) found in human ovaries
c) characterized by a yellow colour
d) contributory in maintaining pregnancy
Ans. (c)
50. Expanded proximal part of oviduct is:
a) uterus
b) isthmus
c) vestibule
d) fimbriated funnel
Ans. (d)
51. Which one of the following is out of place?
a) Ureter
b) Vagina
c) Uterus
d) Oviduct
Ans. (a)
52. Mark the series with odd:
a) Endometrium, graafian follicle, polar
body
b) Spermatocyte, prostate, spermatid,
acrosome
c) Ovaries, vagina, Batholin’s gland,
corpus luteum
d) Vas
deferens,
Fallopian
tube,
epididymis, Cowper’s gland
Ans. (d)
53. The cellular layer that disintegrates and
regenerates again and again in humans is:
a) dermis of skin
b) cornea of the eye
c) endometrium of uterus
d) endothelium of blood vessels
Ans. (c)
54. Bartholin’s glands occur in:
a) Males and form liquid part of semen
b) Females and help in vestibular
lubrication
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DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
c) Males and produce alkaline fluid for
neutralizing urethral acidity
d) Females and produce estrogen for
regulating secondary sexual characters
Ans. (b)
55. Bartholin’s glands of female correspond to
which glands in male?
a) Rectal glands
b) Inguinal glands
c) Prostate glands
d) Cowper’s glands
Ans. (d)
56. Vaginal orifice and urethral orifice open into:
a) cervix
b) vulva
c) labia majora
d) labia minora
Ans. (b)
57. Labium majora of a female mammal is
homologous to:
a) scrotal sac
b) prostate gland
c) epididymis
d) seminal vesicle
Ans. (a)
58. Which of the following is unpaired in a mammal?
a) Ovary
b) Clitoris
c) Fallopian tube
d) Cowper’s gland
Ans. (b)
59. The starting of menstruation in girls is:
a) puberty
b) menarche
c) climacteric
d) menopause
Ans. (b)
60. The phase of menstrual cycle in humans
that lasts for 3-4 days is:
a) luteal phase
b) menstruation
c) ovulatory phase
d) follicular phase
Ans. (b)
61. Ovary secretes large quantity of estrogen
during:
a) menopause
b) lactation
c) preovulatory period d) menstrual phase
Ans. (c)
62. Which of the following hormones is active
during proliferative phase of menstrual cycle?
a) Estrogen
b) Progesterone
c) Testosterone
d) All of these
Ans. (a)
63. Progesterone hormone is active during:
a) follicular phase
b) secretory phase
c) menstrual phase
d) proliferative phase
Ans. (b)
64. In the absence of pregnancy, corpus
luteum:
a) degenerates after some time
b) is maintained by progesterone
c) becomes active, secretes FSH and LH
d) produces a lot of oxytocin and relaxin
Ans. (a)
65. In human female, which of the following is
incorrect?
a) Menstruation takes 4 days
b) Menstrual cycle takes 28 days
c) Menopause occur at an age of 45-55
years
d) The ovulated eggs released during
pregnancy die
Ans. (d)
66. Cessation of menstrual cycle is termed:
a) menarche
b) menopause
c) impotency
d) puberty
Ans. (b)
67. After menopause there is a rise in urinary
excretion of:
a) FSH
b) STH
c) Oxytocin
d) Oestrogen
Ans. (a)
68. Estrous cycle is characteristic of:
a) all mammals
b) human females
c) mammalian females
d) non-primate mammalian females
Ans. (d)
69. Estrous period is an indication of:
a) pregnancy
b) breeding period
c) menopause
d) estrogen secretion
Ans. (b)
70. Which of the following are supposed to be
immortal?
a) Brain cells
b) Germ cells
c) Pituitary cells
d) All of these
Ans. (b)
71. Which type of cell division occurs in the
gonads?
a) Mitosis only
b) Meiosis only
c) Amitosis and meiosis
d) Both mitosis and meiosis
Ans. (d)
72. If a germ cell in a female gonad and a germ cell in
a male gonad begin undergoing meiosis
simultaneously, what will be the ratio of ova and
sperms produced?
a) 1 : 1
b) 1 : 2
c) 1 : 4
d) 2 : 1
Ans. (c)
73. By which cell division spermatogonia are
formed?
a) Mitosis
b) Amitosis
c) Meiosis I
d) Meiosis II
Ans. (a)
74. Spermatogenesis is mainly promoted by:
a) FSH
b) MSH
c) ACTH
d) none of the above
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DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
Ans. (a)
75. Correct sequence of cell stages in
spermatogenesis is:
a) spermatocytes, spermatids, spermatogonia,
spermatozoa
b) spermatogonia, spermatocytes, spermatids,
spermatozoa
c) spermatocytes, spermatogonia, spermatids,
spermatozoa
d) spermatogonia, spermatids, spermatocytes,
spermatozoa
Ans. (b)
76. In spermatogenesis, the phase of
maturation involves:
a) The growth of spermatogonia into
primary spermatocyte
b) The formation of spermatogonia from
gonocytes through mitosis
c) The formation of spermatids from
primary spermatocytes through meiosis
d) The formation of spermatogonia from
the spermatocytes through meiosis
Ans. (c)
77. Which one of the following pairs is diploid?
a) Spermatid and sperm
b) Spermatogonia and spermatid
c) Primary and secondary spermatocytes
d) Spermatogonia and primary spermatocyte
Ans. (d)
78. Which of the following are haploid in
nature?
1) Spermatids
2) Spermatogonia
3) Primary spermatocytes
4) Secondary spermatocytes
Answer codes:
a) 1 and 2 are correct
b) 1 and 4 are correct
c) 2 and 4 are correct
d) 1, 2 and 3 are correct
Ans. (b)
79. Number of spermatozoa produced by a
single
secondary
spermatocyte
during
spermatogenesis is:
a) one
b) two
c) four
d) eight
Ans. (b)
80. Sperms formed from four primary spermatocytes
are:
a) 1
b) 4
c) 16
d) 32
Ans. (c)
81. How many secondary spermatocytes are
required to form 400 spermatozoa?
a) 40
b) 100
c) 200
d) 400
Ans. (c)
82. Conversion of spermatid to a spermatozoan
is called:
a) cytokinesis
b) vitellogenesis
c) spermiogenesis
d) spermatogenesis
Ans. (c)
83. In the given diagram identify parts named
1 – 5:
a) 1-nucleus, 2-tail, 3-mitochondria, 4acrosome, 5-centriole
b) 1-acrosome, 2-nucleus, 3-centriole, 4mitochondria, 5-plasma membrane
c) 1-nucleus, 2-mitochondria, 3-plasma
membrane, 4-centriole, 5-neck
d) 1-acrosome, 2-centriole, 3-mitochondria,
4-plasma membrane, 5-tail
Ans. (b)
84. The actual genetic part of the sperm is:
a) tail
b) head
c) acrosome
d) middle piece
Ans. (b)
85. Acrosome is found in the sperm at the:
a) tail
b) neck
c) top of head
d) middle piece
Ans. (c)
86. Acrosome of sperm is formed from:
a) Nucleus of spermatid
b) Centrosome of spermatid
c) Mitochondria of spermatid
d) Golgi complex of spermatid
Ans. (d)
87. The formation of the acrosome:
a) involves mitotic activity
b) occurs in the epididymis
c) involves meiotic divisions
d) involves the maturation of lytic enzymes
Ans. (d)
88. The lytic enzyme released by sperm is:
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DR. ARVIND’S BIOLOGY CLASSES
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a) ligase
b) acrosome
c) fertilizin
d) hyaluronidase
Ans. (d)
89. How many centrioles are normally present
in a sperm?
a) One
b) Two
c) Many
d) None of these
Ans. (b)
90. Which organelle is absent in human sperm?
a) ER
b) Nucleus
c) Centriole
d) Mitochondria
Ans. (a)
91. Middle piece of sperm contains:
a) mitochondria and Golgi body
b) centriole and Golgi body
c) axial filament and Golgi body
d) mitochondria and axial filament
Ans. (d)
92. Which of the following represents a
condition where the motility of the sperms is
highly reduced?
a) Polyspermy
b) Azoospermia
c) Oilgospermia
d) Asthenospermia
Ans. (d)
93. During oogenesis, each diploid cell
produces:
a) Four functional cells
b) Four nonfunctional polar bodies
c) One functional egg and three polar bodies
d) Two functional eggs and two polar bodies
Ans. (c)
94. Oogonium is:
a) haploid
b) diploid
c) triploid
d) euploid
Ans. (b)
95. The number of chromosomes in a mature
gamete gets halved during:
a) Meiosis II
b) Formation of first polar body
c) Formation of second polar body
d) Division of secondary oocyte and
secondary spermatocyte
Ans. (b)
96. In which phase of cell division is oocyte
arrested?
a) Interphase
b) Prophase I
c) Anaphase II
d) Both prophase I and II
Ans. (b)
97. During oogenesis in mammals, the second
meiotic division is completed
a) Before ovulation
b) After fertilization
c) In the formation of the primary oocyte
d) In the formation of the secondary oocyte
Ans. (b)
98. How many eggs will be formed from 100
primary oocytes?
a) 100
b) 200
c) 300
d) 400
Ans. (a)
99. How many ova and sperms will be
produced from 100 secondary oocytes and
100 secondary spermatocytes during
gametogenesis in man?
a) 50 ova, 100 sperms
b) 100 ova, 100 sperms
c) 200 ova, 200 sperms
d) 100 ova, 200 sperms
Ans. (d)
100. 100 eggs and 100 sperms can be
produced from ……. and ………meiotic
divisions respectively.
a) 25, 25
b) 100, 25
c) 100, 100
d) 25, 100
Ans. (b)
101. One million oocytes and one million
secondary spermatocytes will give:
a) 2 million ova 1 million sperms
b) 2 million ova and 2 million sperms
c) 1 million ova and 2 million sperms
d) 1 million ova and 1 million sperms
Ans. (c)
102. Which one of the following is haploid?
a) Oogonia
b) Primary oocyte
c) Secondary oocyte
d) Primary spermatocyte
Ans. (c)
103. Which statement is true?
a) At the onset of menopause, the
human female stops producing FSH &
LH
b) Primary oocytes are produced by the
human
female
throughout
adolescence
c) Oocytes produced by the females are
stored in the seminiferous tubules
d) At birth, the human female has
produced all the oocytes she will ever
produce
Ans. (d)
104. Cytoplasm of ovum does not contain:
a) Ribosomes
b) Mitochondria
c) Golgi bodies
d) Centrosomes
Ans. (d)
105. During a woman’s life time, she produces
about:
a) 40-50 eggs
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DR. ARVIND’S BIOLOGY CLASSES
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b) 300 – 350 eggs
c) 400 – 500 eggs
d) 750 – 850 eggs
Ans. (c)
106. The change in a mammalian sperm which
prepares it to fertilize the ovum is termed:
a) maturation
b) preparation
c) capacitation
d) metamorphosis
Ans. (c)
107. Capacitation of sperms occurs in:
a) epididymus
b) vas efferens
c) vas deferens
d) female genital tract
Ans. (d)
108. During fertilization, the enzyme which
facilitates penetration of the egg by the
spermatozoan is:
a) hyaluronidase
b) acid phosphatase
c) acetylcholinesterase
d) alkaline phosphatase
Ans. (a)
109. Match the following with correct combination:
A hyaluronidase 1 acrosomal reaction
B corpus luteum 2 morphogenetic movements
3 progesterone
C gastrulation
4 mammary gland
D capacitation
5 sperm activation
E colostrum
Answer codes:
a) A = 5, B = 2, C = 4, D = 1, E = 3
b) A = 1, B = 3, C = 2, D = 5, E = 4
c) A = 3, B = 2, C = 5, D = 4, E = 1
d) A = 1, B = 2, C = 3, D = 4, E = 5
Ans. (b)
110. Find out the correct sequence in
embryonic development of animal:
a) Cleavage, zygote, fertilization, morula,
blastula, gastrula
b) Fertilization, zygote, cleavage, morula,
blastula, gastrula
c) Fertilization, cleavage, morula, zygote,
blastula, gastrula
d) Fertilization, zygote, blastula, morula,
cleavage, gastrula
Ans. (b)
111. What is true about cleavage in fertilized
egg in humans?
a) It is meroblastic
b) It is identical to normal mitosis
c) It starts when the egg reaches uterus
d) It starts while the egg is in Fallopian
tube
Ans. (d)
112. Cleavage in mammals is:
a) Discoidal
b) Superficial
c) Equal holoblastic
d) Unequal holoblastic
Ans. (d)
113. The embryo at 16-celled stage is known
as:
a) morula
b) gastrula
c) blastula
d) blastomere
Ans. (a)
114. Zone pellucida disintegrates
a) just after fertilization
b) before fertilization
c) before cleavage
d) after completion of cleavage
Ans. (d)
115. Which germ layer develops first during
embryonic development?
a) ectoderm
b) mesoderm
c) endoderm
d) both (b) and (c)
Ans. (c)
116. In mammals, the body of embryo is formed
from:
a) trophoblast
b) inner cell mass
c) outer cell mass
d) trophoectoderm
Ans. (b)
117. The main function of trophoectoderm in
mammalian embryo is:
a) Formation of future ectoderm
b) Protection of developing cells
c) Drawing food for developing cells
d) Formation of body of developing
embryo
Ans. (c)
118. Secretion of which of the following
structure prepares inner wall of uterus for
implantation?
a) Gastrula
b) Pituitary gland
c) Corpus luteum
d) Ovarian follicle
Ans. (c)
119. In human, secretion of which of the
following is used to confirm implantation of
embryo?
a) Corpus luteum
b) Morula
c) Trophoblast
d) Inner cell mass
Ans. (c)
120. The fertilized egg in human female is
implanted in the uterus after:
a) one month of fertilization
b) two months of fertilization
c) three weeks of fertilization
d) about seven days of fertilization
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DR. ARVIND’S BIOLOGY CLASSES
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Ans. (d)
121. What is implanted in the uterus?
a) Morula
b) Neurula
c) Zygote
d) Blastocyst
Ans. (d)
122. The portion of the endometrium that covers
the embryo and is located between the
embryo and uterine cavity is the :
a) decidua basalis
b) decidua umbilicus
c) decidua capsularis
d) decidua functionalis
Ans. (c)
123. Human embryo will be called as a ‘foetus’
after:
a) two months
b) six months
c) four months
d) seven months
Ans. (a)
124. Gestation period is the duration:
a) Of fertilization
b) Between egg growth and ovulation
c) Between fertilization and parturition
d) Of preparation of sex cells and
fertilization
Ans. (c)
125. Study the following:
A. Testosterone influences the male
secondary sexual characters
B. Gestation period in dog is approximately 276
days
C. Bulbo-urethral glands secrete a cervical
lubricant
D. Placenta secretes estrogen
The correct answer is:
a) C and D
b) A and B
c) A and D
d) B, C and D
Ans. (c)
Hint: Gestation period of dog is about 63
days. Bulbo urethral glands secrete a
lubricant for vestibule.
126. The immediate cause of induction of
ovulation in female is the large plasma
surge of:
a) LH
b) FSH
c) Estradiol
d) Progesterone
Ans. (a)
127. Correctly matched pairs are:
1. Clitoris
- Erectile body in female
homologous to penis of male
2. Sexual intercourse – coitus
3. Colostrum - Secretion found in seminal
fluid
4. Areola
- Pigmented circular area
around the nipple
Answer codes:
a) 1 and 2 are correct
b) 2 and 4 are correct
c) 1 and 3 are correct
d) 1, 2 and 4 are correct
Ans. (d)
128. In oogenesis, haploid egg is fertilized by
sperm at which stage?
a) Ovum
b) Oogonium
c) Primary oocyte d) Secondary oocyte
Ans. (d)
129. 2n = 6 in a primary spermatocyte which is
in metaphase of first meiotic division. What
shall be the total number of chromatids in
each of the secondary spermatocyte?
a) 6
b) 8
c) 24
d) 32
Ans. (a)
130. Some important events in the human
female reproductive cycle are given below.
Arrange the events in a proper sequence:
A – Secretion of FSH, B – growth of corpus
luteum, C-growth of the follicle and
oogenesis, D-ovulation, E-sudden increase
in the levels of LH
a) ADCEB
b) BACDE
c) ACEDB
d) CADBE
Ans. (c)
131. The 16 cells stage of the human embryo is:
a) smaller than the fertilized egg
b) same size as the fertilized egg
c) two times of the size of the fertilized
egg
d) four times the size of the fertilized egg
Ans. (b)
132. The main function of the fimbriae of the
Fallopian tube in females is to:
a) help in the development of ovary
b) help in the development of corpus
luteum
c) release to ovum from the Graafian
follicle
d) help in the collection of the ovum after
ovulation
Ans. (d)
133. The principal tail piece of human sperm
shows the microtubular arrangement of:
a) 7 + 2
b) 9 + 2
c) 11 + 2
d) 13 + 2
Ans. (b)
134. Eggs of placental mammals are expected
to be
a) alecithal
b) polylecithal
c) telolecithal
d) mesolecithal
Ans. (a)
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DR. ARVIND’S BIOLOGY CLASSES
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135. The eggs of some mammals have more
yolk. They are:
a) eutherians
b) prototherians
c) metatherians
d) aquatic mammals
Ans. (b)
136. Human egg is:
a) alecithal
b) centrolecithal
c) telolecithal
d) megalecithal
Ans. (a)
137. Eggs having yolk in centre and cytoplasm
in a peripheral region are called:
a) isolecithal
b) telolecithal
c) microlecithal
d) centrolecithal
Ans. (d)
138. Which of the following is a primary egg
membrane?
a) Zona pellucida
b) Corona radiata
c) Shell
d) All of these
Ans. (a)
139. The sperm penetrates the ovum mainly:
a) chemically
b) thermally
c) mechanically
d) electrostatically
Ans. (a)
140. What is true about fertilization?
a) Only one sperm enters an egg
b) Only acrosome of sperm enters the
egg
c) Entry of sperm activates the egg to
complete mitosis
d) Two haploid nuclei fuse but the fusion
nucleus divides immediately to form
two haploid nuclei
Ans. (a)
141. Fertilization involves all of the following
except:
a) Metabolic activation of egg
b) Breakdown
of
the
acrosomal
membrane
c) Second meiotic division of sperm
nucleus
d) Binding of the sperm cell to coating
surrounding the egg
Ans. (c)
142. Which chemical of the egg attracts and
holds sperm?
a) Fertilizin
b) Agglutinin
c) Antifertilizin
d) Antiagglutinin
Ans. (a)
143. The chemical substance found in the surface
layer of cytoplasm of spermatozoa is:
a) agglutinin
b) fertilizin
c) hyaluronidase
d) antifertilizin
Ans. (d)
144. After a sperm has penetrated an ovum,
entry of further sperm is prevented by:
a) condensation of yolk
b) formation of pigment coat
c) development of vitelline membrane
d) development of cortical reaction
Ans. (d)
145. Secondary oocyte is formed:
a) after fertilization
b) before fertilization
c) after complete meiosis of germ cells
d) before puberty
Ans. (b)
146. The fusion of male and female pronuclei is
known as:
a) eumixis
b) capacitation
c) acrosome reaction
d) amphimixis
Ans. (d)
147. The significance of fertilization:
a) restore chromosome number
b) double chromosome number
c) reduce chromosome number
d) none of the above
Ans. (a)
148. Cleavage differs from mitosis in that it:
a) occurs in zygote
b) occurs in all body cells
c) occurs only in invertebrates
d) results in identical daughter cells
Ans. (a)
149. Select the correct statement:
a) Cleavage follows gastrulation
b) Yolk sac of human embryo is rich in
yolk.
c) Cleavage is repeated equational
divisions of zygote
d) Gastrulation and blastulation are
followed by each other
Ans. (c)
150. Cleavage is a unique form of mitotic cell
division in that:
a) there is no growth of cells
b) the nucleus does not particulars
c) no spindle develops to drag chromosomes
d) the plasma membranes of daughter
cells do not separate
Ans. (a)
151. Cleavage differs from mitosis in lacking:
a) Synthetic phase
b) Growth phase
c) Both synthetic and growth phase
d) Reduction in chromosome number
Ans. (b)
152. During cleavage, the cell division is very
rapid. The daughter cells do not undergo
any growth and the cells thus become
gradually smaller in volume. Hence:
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DR. ARVIND’S BIOLOGY CLASSES
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a)
b)
c)
d)
the embryo becomes haploid
the embryo grows in volume
the embryo becomes smaller in volume
there is no increase in the volume of
the embryo
Ans. (d)
153. Which one of the following is incorrect?
a) fertilization follows capacitation
b) cleavage of fertilized ovum results in
blastula
c) fusion of sperm and ovum occurs in
fallopian tube
d) cleavage leads to increase in the mass
of protoplasm
Ans. (d)
154. In embryo, cleavage brings about:
a) increased size
b) increased DNA content
c) change in shape and size
d) increased mass of protoplasm
And. (b)
155. In an egg, the type of cleavage is
determined by:
a) number of egg membranes
b) size and location of nucleus
c) shape and size of the sperm
d) amount and distribution of yolk
Ans. (d)
156. When the cleavage furrow passes through
the centre of animal-vegetal axis, the
cleavage is:
a) vertical
b) latitudinal
c) equatorial
d) meridional
Ans. (d)
157. A zygote is completely divided into two by
a cleavage furrow. The cleavage type is:
a) radial
b) equatorial
c) holoblastic
d) meroblastic
Ans. (c)
158. Solid ball of cells formed during cleavage
is:
a) morula
b) foetus
c) gastrula
d) blastocyst
Ans. (a)
159. A morula can be differentiated from
blastula in:
a) Absence of yolk
b) Presence of cavity
c) Absence of cavity
d) Presence of more yolk
Ans. (c)
160. The morphogenetic movements change
the hollow spherical blastula into a:
a) morula
b) gastrula
c) foetus
d) embryonic disc
Ans. (b)
161. The best definition of the process of
gastrulation is that it is a process where
the:
a) Blastocoel is formed
b) Zygote gets converted to larva
c) Cells move to occupy their definite
position
d) Simple layered blastula becomes twolayered
Ans. (c)
162. Which of the following tissues originate
from the ectoderm of the embryo?
a) Nervous tissue
b) Epithelial tissue
c) Muscular tissue
d) Connective tissue
Ans. (a)
163. During embryonic development, endoskeleton
and muscles develop from:
a) ectoderm
b) mesoderm
c) endoderm
d) yolk plug
Ans. (b)
164. Notochord develops from embryonic:
a) ectoderm
b) endoderm
c) mesoderm
d) all of these
Ans. (c)
165. Which of the following sets contain only
mesodermal structures?
a) Liver, heart, blood, muscles
b) Pancreas, heart, blood, bones
c) Notochord, bones, cardiac muscles,
blood
d) Liver, blood, muscles, notochord
Ans. (c)
166. Organs of which set are endodermal
derivatives?
a) Liver, thyroid, pancreas
b) Brain, choroid, nerves
c) Kidneys, ureters, ovary
d) Testis, adrenal cortex, thymus
Ans. (a)
167. The extraembryonic membranes of mammalian
embryo are derived from:
a) trophoblast
b) follicle cells
c) endodermal cells
d) inner cell mass
Ans. (a)
168. Which statement about trophoblast cells is
true?
a) They are endodermal cells
b) They secrete proteolytic enzymes
c) They are capable of producing
dizygotic twins
d) They are derived from the endoderm
Ans. (b)
169. Mammalian foetus is directly surrounded by:
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DR. ARVIND’S BIOLOGY CLASSES
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a) yolk sac cavity
b) amniotic cavity
c) allantoic cavity
d) Primary digestive cavity
Ans. (b)
170. The fluid released from the vagina just
prior to childbirth is:
a) amniotic fluid
b) baby’s accumulated urine
c) mother’s plasma from umbilical cord
d) baby’s plasma form its foetal circulation
Ans. (a)
171. What is the function of amniotic cavity?
a) Nutrition
b) Excretion
c) Respiration
d) Protection from shocks
Ans. (d)
172. The function of allantoic-chorion in mammals
is:
a) excretory alone
b) respiratory alone
c) endocrine only
d) excretory, respiratory and nutritive
Ans. (d)
173. Placenta is universally present in:
a) Birds
b) Reptiles
c) Eutherian mammals
d) Prototherian mammals
Ans. (c)
174. Placenta is:
a) A cord that connects the foetus with
wall of mother’s uterus
b) A part of foetus only through which
exchange of materials takes place
between foetus and mother
c) A part of mother’s uterine wall through
which exchange of materials occur
between mother and foetus
d) Chorionic villi of foetus and a part of
mother’s uterine wall through which
chemical exchange between foetus
and mother occurs
Ans. (d)
175. Blood flowing through umbilical cord of
mammalian embryo is:
a) 100% foetal
b) 100% maternal
c) 50% maternal and 50% foetal
d) 75% maternal and 25% foetal
Ans. (a)
176. Structure connecting the foetus to placenta is:
a) chorion
b) amnion
c) yolk sac
d) umbilical cord
Ans. (d)
177. Umbilical cord contains:
a) placenta
b) embryonic villi
c) umbilicus
d) umbilical artery and vein
Ans. (d)
178. As a result of metabolism in mammalian
embryo :
a) No wastes are produced
b) Wastes are absorbed by embryo
c) Wastes are eliminated through
mother’s body
d) Accumulated wastes are eliminated
after birth
Ans. (c)
179. In human being, placenta is formed by:
a) chorion
b) amnion
c) yolk sac
d) all of these
Ans. (a)
180. Mammalian placenta has minute finger-like
projections known as;
a) chorionic villi
b) chorionic vessel
c) chorionic extension
d) chorionic network
Ans. (a)
181. On the basis of nature of maternal and
foetal tissue involved, types of placenta
are:
1. haemo-endothelial placenta
2. haemo-chorial placenta
3. discoidal placenta
4. deciduate placenta
Answer codes:
a) 1 and 2 are correct
b) 2 and 4 are correct
c) 1 and 3 are correct
d) 1,2 and 3 are correct
Ans. (a)
182. Human placenta is:
a) haemo-chorial
b) epithelio –chorial
c) haemo-endothelial d) syndesmo-chorial
Ans. (a)
183. In simplest type of placenta, six barriers
separates maternal blood from foetal
blood. How many barriers are lost in
human placenta?
a) One
b) Four
c) Two
d) Three
Ans. (d)
Hint: Uterine epithelium, uterine connective
tissue & endothelium of maternal blood
vessel disappear.
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DR. ARVIND’S BIOLOGY CLASSES
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184. Drugs that cause malformation in embryo
during pregnancy are called :
a) nicotine
b) sedatives
c) teratogens
d) tranquillizer
Ans. (c)
185. The chemical substance released by
activated spermatozoa that acts on the
ground substances of the follicle cells is
known as:
(Kerala PMT 2009)
a) relaxin
b) teratogen
c) progesterone
d) hyaluronidase
Ans. (d)
186. Choose the incorrect statement from the
following:
a) In birds and mammals internal fertilisation
takes place
b) Colostrum contains antibodies and
nutrients
c) Polyspermy in mammals is prevented by
the chemical changes in the sperm surface
d) In the human female implantation occurs
almost seven days after fertilisation
Ans. (c)
187. Identify the correct statement from the following:
a) High levels of estrogen triggers the
ovulatory surge
b) Oogonial cells start to proliferate and
give rise to functional ova in regular
cycles from puberty onwards.
c) Sperms released from seminiferous
tubules are highly motile
d) Progesterone level is high during the
post ovulatory phase of menstrual cycle
Ans. (d)
Hint: If in statement (a) it was mentioned
‘Pre-ovulatory surge of LH’ then it would
also have been correct.
188. Spot the odd one out from the following
structures with reference to the male
reproductive system:
a) Rete testis
b) Epididymis
c) Vasa efferentia
d) Isthmus
Ans. (d)
189. Seminal plasma, the fluid part of semen, is
contributed by
i. Seminal vesicle
ii. Prostate
iii. Urethra
iv. Bulbourethral gland
a) i and ii
b) i, ii and iv
c) ii, iii and iv
d) i and iv
Ans. (b)
190. Spermiation is the process of the release
of sperms from:
a) Seminiferous tubules
b) Vas deferens
c) Epididymis
d) Prostate gland
Ans. (a)
191. Mature Graafian follicle is generally present
in the ovary of a healthy human female
around
a) 5 – 8 day of menstrual cycle
b) 11 – 17 day of menstrual cycle
c) 18 – 23 day of menstrual cycle
d) 24 – 28 day of menstrual cycle
Ans. (b)
192. Acrosomal reaction of the sperm occurs due
to:
a) Its contact with zona pellucida of the ova
b) Reactions within the uterine environment
of the female
c) Reactions within the epididymal environment
of the male
d) Androgens produced in the uterus
Ans. (a)
193. The immature male germ cell undergoes
division to produce sperms by the process
of spermatogenesis. Choose the correct
one with reference to above.
a) Spermatogonia have 46 chromosomes
and always undergo meiotic cell division
b) Primary spermatocytes divide by mitotic
cell division
c) Secondary spermatocytes have 23
chromosomes and undergo second
meiotic division
d) Spermatozoa are transformed into
spermatids
Ans. (c)
194. Match between the following representing
parts of the sperm and their functions and
choose the correct option.
Col. A
Col. B
A. Head
i. Enzymes
B. Middle piece
ii. Sperm motility
C. Acrosome
iii. Energy
D. Tail
iv. Genetic material
Options:
a) A-ii, B-iv, C-i, D-iii b) A-iv, B-iii, C-i, D-ii
c) A-iv, B-i, C-ii, D-iii d) A-ii, B-i, C-iii, D-iv
Ans. (b)
195. Which among the following has 23
chromosomes?
a) Spermatogonia
b) Zygote
c) Secondary oocyte
d) Oogonia
Ans. (c)
196. Match the following and choose the correct
options:
A.
Trophoblast
(i)
B.
Cleavage
(ii)
Embedding of blastocyst
in the endometrium
Group of cells that would
differentiate as embryo
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DR. ARVIND’S BIOLOGY CLASSES
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C.
Inner cell
mass
(iii)
D.
Implantation
(iv)
Outer layer of blastocyst
attached to the endometrium
Mitotic division of zygote
a) A – (ii), B – (i), C – (iii), D – (iv)
b) A – (iii), B – (iv), C – (ii), D – (i)
c) A – (iii), B – (iv), C – (ii), D – (i)
d) A – (ii), B – (iv), C – (iii), D – (i)
Ans. (b)
197. Which of the following hormones is not
secreted by human placenta?
a) hCG
b) Estrogens
c) Progesterone
d) LH
Ans. (d)
198. The vas deferens receives duct from the
seminal vesicle and opens into urethra as:
a) Epididymis
b) Ejaculatory duct
c) Efferent ductule
d) Ureter
Ans. (b)
199. Urethral meatus refers to the:
a) Urinogenital duct
b) Opening of vas deferens into urethra
c) External opening of the Urinogenital duct
d) Muscles surrounding the urinogenial duct
Ans. (c)
200. Morula is a developmental stage:
a) Between the zygote and blastocyst
b) Between the blastocyst and gastrula
c) After the implantation
d) Between implantation and parturition
Ans. (a)
201. The cellular cover of the ovum at ovulation is:
a) Corona radiata
b) Zona radiata
c) Zona pellucida
d) Chorion
Ans. (a)
Hint: The human ovum is enclosed by two
additional egg coats. Inner noncellular
zona pellucida which is secreted by the
ovum and is made of glycoproteins. It is a
primary egg membrane. The second coat
is the outer corona radiata, which is
formed by the follicle cells of the ovary
and is a secondary membrane.
202. Identify the odd one from the following:
a) Labia minora
b) Fimbriae
c) Infundibulum
d) Isthmus
Ans. (a)
203. Consider
the
following
statements
regarding corpus luteum and corpus
albicans associated with the ovary in
mammals
(i) Corpus luteum produces hormones for
the ovulation
(ii) Corpus luteum produces hormone which
is essential for the preparation of
reproductive tract for pregnancy and in
many mammals for the maintenance of
pregnancy.
(iii) Following the degeneration of corpus
luteum all that remains is whitish
scarlike remnant connective tissue, the
corpus albicans.
(iv) Corpus albicans produces hormones for
ovulation. Of these statement:
a) (i) and (iii) are correct
b) (ii) and (iii) are correct
c) (ii) and (iv) are correct
d) (iii) and (iv) are correct
Ans. (b)
204. Which of the following statements about
the female reproductive system are true or
false?
1. Both FSH and LH are necessary for
ovulation to take place.
2. Oestrogen tends to inhibit the production
of FSH by the anterior pituitary gland.
3. Fertilization of the ovum by the
spermatozoon normally takes place in
the uterus.
4. Progesterone production is largely
under the control of LH
5. Throughout the part of the menstrual
cycle that follows ovulation, there is a
slight rise in body temperature.
a) + + - + +
b) - - + + +
c) - + - + d) + + - - Ans. (a)
205. Go through the following statements:
(i) The transitional phase in females during
which the genital organs regress in
response to the withdrawl of gonadal
activity is called climacteric.
(ii) Menstrual blood is predominantly arterial
and clots very fast due to the high
content of fibrinogen in it.
(iii) In pseudoprecocious puberty, the levels
of sex hormones and gonadotropins are
much higher than the normal levels.
(iv) The primary oocyte starts its first meiotic
division before birth but remains
suspended in diplotene till puberty.
Which of these are correct?
a) (ii) & (iv)
b) (i) & (iv)
c) (i), (ii) & (iv)
d) All are correct
Ans. (b)
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DR. ARVIND’S BIOLOGY CLASSES
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Hint: Menstrual blood normally does not clot
due to the presence of fibrinolysin in it.
In pseudo-precocious puberty, levels
of gonadotropins are low.
206. Go through the following statements:
(i) The secondary oocyte undergoes
meiosis II which proceeds only till
metaphase until a sperm enters it.
(ii) Ovulation occurs about 36 – 38 hours
after the start of LH surge at midcycle.
(iii) In humans, it takes about 74 hours to
form a mature sperm from a primitive
germ cells.
(iv) About 70% of the human ejaculate is
contributed by bulbourethral glands
Which of these are correct?
a) (i) & (iii)
b) (ii) & (iii)
c) (i) & (ii)
d) All are correct
Ans. (c)
Hint: It takes about 74 days for spermatogenesis.
70% of human ejaculate is contributed by
seminal vesicle.
207. What would happen if vasa deferentia of
man are cut?
a) Sperms are non-nucleate
b) Spermatogenesis does not occur
c) Semen is without sperms
d) Sperms are nonmotile
Ans. (c)
208. Go through the following statements:
(i) Relaxin produced by the ovary, facilitates
delivery of the foetus by softening the
connective tissue of pubic symphysis
and relaxing the pelvic ligaments and
joints.
(ii) By the end of fifth month of pregnancy,
the foetus develops limbs and digits.
(iii) Thalidomide is a teratogenic drug which
causes a condition called phocomelia.
(iv) Although the levels of prolactin are high
during pregnancy, milk secretion does
not occur because of the high oestrogen
and progesterone levels which make the
breast unresponsive to the prolactin.
Which of these are correct?
a) (i), (ii) & (iii)
b) (i), (iii) & (iv)
c) (ii), (iii) & (iv)
d) All are correct
Ans. (b)
Hint: Foetus develops limbs and digits by
the end of second month.
209. The ________cells provide nutrition to
male germ cells.
The ____cells synthesise and secrete
androgens
Find the option which correctly fills in the
above blanks in order
a) Spermatogonia, Interstitial cells
b) Interstitial cells; Spermatogonia
c) Sertoli; Leydig
d) Leydig; Sertoli
Ans. (c)
210. In the given diagram; choose the option
which correctly shows the match of the
organ and the event
Organ
Event
a)
A
Endometrium Secrete estrogen
b)
B
Ovary
Implantation
c)
C
Isthmus
Fertilization*
Cervix
Copulation
d) D
Ans. (c)
211. Identify X and Y in the diagram related to
human reproductive system. Choose the
correct option:
Y – Epididymis
Y – Seminal
vesicle
c) X- Prostate
Y – Vasdeferens
d) X- Bulbourethral gland Y- Seminal vesicle
Ans. (b)
212. Three cells are labelled A, B and C. Select
the option which correctly tells the cells
which produce androgen.
a) X- Seminal vesicle
b) X- Prostate
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DR. ARVIND’S BIOLOGY CLASSES
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a) Only A
b) Only B
c) A and C
d) All three
Ans. (a)
213. Given is the stage of a growing embryo
and different regions of the fallopian tube
marked 1, 2, 3, 4
Where do you think the given stage of
embryo will be seen in the fallopian tube
a) 4
b) 3
c) 2
d) 1
Ans. (a)
214. Find the correct match regarding human
foetal development
Month of pregnancy Event occurring
a) End of 4th month
Eyelashes appear
rd
b) End of 3 month
Movements of Foetus
c) End of 5th month
Hair on head
nd
d) End of 2 month
Organ systems develop
Ans. (c)
Hint: End of 2nd month = Foetal limbs and
digits appear
End of 3rd month = Major organ systems
develop.
Limbs well developed.
External genitalia
well developed.
During 5th month = 1st movement
Hair on the head appear
End of 6th month = Eye lids separate
Eye lashes appear
215. Consider the following statements
1. Oxytocin is a ‘milk ejection’ hormone
2. Progesterone causes termination of
pregnancy
3. Relaxin causes termination of pregnancy
Which of the statements given above is/are
correct?
a) 1 only
b) 2 and 3
c) 3 only
d) 1, 2 and 3
Ans. (a)
216. Consider the following statements.
Placenta present in mammals acts as an
endocrine tissue and produces
1. Human chorionic gonadotrophin
2. Oestrogen
3. Progesterone
4. Testosterone
Which of these statements are correct?
a) 1 and 4
b) 1 and 2
c) 1, 2 and 3
d) 2, 3 and 4
Ans. (c)
217. Consider the following
1. Endothelium of foetal blood capillaries
2. Connective tissue surrounding foetal
blood capillaries
3. Chorionic epithelium
4. Maternal epithelium
5. Connective tissue surrounding maternal
blood capillaries
6. Endothelium of maternal blood capillaries
In the case of humans, the placenta
comprises which of the above?
a) 1, 2, 3, 4, 5 and 6
b) 1, 2, 3 and 6
c) 1, 2 and 3
d) 1, 2, 3 and 5
Ans. (c)
218. How are mature human sperm and ova
similar?
a) They are formed before birth
b) They each have a flagellum that
provides motility
c) They are produced from puberty until
death
d) None of the above
Ans. (d)
219. Trace a sperm cell from the structure
where it is produced to fertilization of the
egg:
1. Seminiferous tubules 2. Vas deferens
3. Uterus
4. Fallopian tube
5. Vagina
6. Epididymis
7. Urethra
a) 6, 1, 2, 7, 5, 3, 4
b) 1, 6, 2, 7, 5, 3, 4
c) 1, 6, 2, 7, 5, 4, 3
d) 1, 2, 6, 7, 5, 3, 4
Ans. (b)
220. How are the time of ovulation and the onset
of menstruation related in the human
menstrual cycle?
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DR. ARVIND’S BIOLOGY CLASSES
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a) Both are triggered by high luteinizing
hormone “spikes” (sharp increase in
concentration)
b) Ovulation occurs approximately 7 days
after the first day of menstruation
c) Ovulation occurs approximately 14 days
before the first day of menstruation
d) All of the above
Ans. (c)
221. Tick the correct statement
a) Proximal and distal centrioles in the
middle piece of sperm help anchor the
flagellum
b) Whereas proximal centriole is non
functional, distal centriole acts as basal
body for the flagellum of sperm
c) The functions of proximal and distal
centrioles are not known
d) Proximal centriole forms the spindle
fibres during cleavage and the distal
centriole anchors the flagellum of sperm
Ans. (d)
222. The intra-testicular genital duct system
does not involvea) Rete testis
b) Ductuli efference
c) Tubuli recti
d) Ductus deference
Ans. (d)
223. Though, the total number of follicles in two
ovaries of a normal young woman is about
4,00,000 the duration between menarche
and menopause is limited. This is attributed
to the –
a) Follicular atresia
b) Liquor folliculi
c) Follicular proliferation
d) Follicular plasticity
Ans. (a)
224.
Hypothalamus
X
Adenohypophysis
Y
Leydig cells
Z
Sertoli cells
Testosterone
Inhibin
In the above diagram identify X, Y and Z
with the sequence of number of appropriate
hormones given below.
(i) Progesteron
(ii) LH
(iii) HCG
(iv) Estradiol
(v) FSH
(vi) GnRH
a) (iii), (iv), (ii)
b) (vi), (ii), (v)
c) (i), (iv), (vi)
d) (vi), (v), (ii)
Ans. (b)
225. Which of the following hormones is not
secreted by human placenta?
a) Relaxin
b) Lactogen
c) Gonadotropin
d) Oxytocin
Ans. (d)
226. In humans, the first polar body formed
during oogenesis has
(i) 46 chromosomes (ii) 23 chromosomes
(iii) 46 chromatids
(iv) 23 chromatids
a) (ii) and (iv)
b) (ii) and (iii)
c) (i) and (iii)
d) (i) and (iv)
Ans. (b)
227. Go through the following statements:
(i) Androgens are produced by the
interstitial cells
(ii) Sertoli cells give rise to germ cells
(iii) Secretions of male accessory glands
constitute the seminal plasma which is rich
in fructose, calcium and certain enzymes
(iv) The presence or absence of hymen is a
very reliable indicator of virginity.
Which of these are correct?
a) (i) & (iii)
b) (iii) & (iv)
c) (i), (iii) & (iv)
d) All are correct
Ans. (a)
228. Go through the following statements:
(i) Primary spermatocytes undergo mitotic
divisions
to
produce
secondary
spermatocytes
(ii) Sperms released from the seminiferous
tubules are fully mature and motile
(iii) The head of sperm possesses many
mitochondria which produce energy for
the movement of tail
(iv) The human male ejaculates about 20 –
30 million sperms during a coitus
Which of these are correct?
a) (i), (ii) & (iii)
b) (ii), (iii) & (iv)
c) (i), (iii) & (iv)
d) All are wrong
Ans. (d)
Hint: Primary spermatocytes undergo first
meiotic division to produce secondary
spermatocyte. Sperms become full
motile & mature in accessory ducts.
Mitochondria are present in the middle
piece of sperm. Single ejaculate contain
200 – 300 million sperms.
229. Go through the following statements
(i) Mammary glands are modified sweat
glands and each mammary gland consists
of 15–25 lobules of the compound tubuloalveolar type.
(ii) The tertiary follicle is characterised by a
fluid filled cavity called antrum
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DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
(iii) Both LH and FSH attain a peak level
towards the middle of the menstrual cycle
(iv) In oogenesis, both first and second
meiotic divisions are unequal
Which of these are correct?
a) (ii) & (iii)
b) (i), (iii) & (iv)
c) (i), (ii) & (iv)
d) All are correct
Ans. (d)
230. Go through the following statements:
(i) The fluid in the antrum of follicle is called
liquor amnii
(ii) During follicular atresia, some thecal
cells persist and secrete a small amount
of androgen
(iii) Vagina is devoid of glands
(iv) Bartholin’s glands of females correspond
to the Cowper’s glands of the male and
their ducts open just outside the hymen
into the vestibule.
Which of these are correct?
a) (i), (ii) & (iii)
b) (ii), (iii) & (iv)
c) (i), (iii) & (iv)
d) All are correct
Ans. (b)
Hint: Fluid in antrum of follicle is called
liquor folliculi.
231. Go through the following statements:
(i) In both pre-pubertal and post-menopausal
females, there are low levels of female sex
hormones and high levels of gonadotrophins.
(ii) There is no bleeding in an oestrous cycle
as the broken endometrium is absorbed.
(iii) Oestrogen is mainly secreted by the
granulosa cells and progesterone mainly
by the theca cells
(iv) Some of the menopausal symptoms can
be reversed HRT wherein a small dose of
gonadotrophins is given to the patient.
Which of these are correct?
a) (ii) & (iii)
b) (i), (ii) & (iv)
c) (i), (ii) & (iii)
d) All are correct
Ans. (a)
232. Go through the following statements:
(i) HCG from placenta stimulates the sertoli
cells of the male foetus to produce
testosterone and is thus indirectly
involved in the development of male
external genitalia
(ii) Sertoli cells secrete a protein called
inhibin, which suppresses FSH synthesis.
(iii) Humans have haemo-endothelial type of
placenta
(iv) Oxytocin stimulates the placenta to
secrete prostaglandins which in turn
stimulate more contractions of uterus.
Which of these are correct?
a) (i) & (iv)
b) (ii) & (iv)
c) (i), (ii) & (iv)
d) All are correct
Ans. (b)
Hint: HCG stimulates Leydig cells to secrete
testosterone. Human placenta is
haemo-chorial.
233. Match list-I (cell type) with list-II
(characteristic) and select the correct answer
using the codes given below the lists
List-I
List-II
A. Spermatogonium 1. Does not divide.
B. Spermatocyte
2. Divides mitotically
C. Spermatid
3. Divides meiotically
D. Sertoli cell
4. Divides both mitotically
and meiotically
5. Nourishes other cell
types
Codes: A
B
C
D
a) 5
3
1
4
b) 1
3
4
5
c) 3
2
4
1
d) 2
3
1
5
Ans. (d)
234. Go through the following statements:
(i) Spermatids are haploid cells derived from
secondary spermatocytes as a result of
second meiotic division
(ii) LH acts on Leydig cells and stimulates
synthesis and secretion of androgens
(iii) The spermatids are transformed into
spermatozoa by the process of spermiation
(iv) In females, oogonia are added only till
the age of puberty.
Which of these are correct?
a) (i) & (ii)
b) (i), (ii) & (iv)
b) (ii), (iii), (iv)
d) All are correct
Ans. (a)
Hint: Spermatids are transformed into
spermatozoa (sperms) through spermiogenesis. Spermiation is the process of
release of sperms from seminiferous
tubules. Oogonia are not formed after birth.
235. Read the following statements carefully:
(i) Lack of menstruation in female of
reproductive age group (i.e., between
puberty and menopause) is always
indicative of pregnancy.
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DR. ARVIND’S BIOLOGY CLASSES
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(ii) The mature Graffian follicle ruptures to
release the ootid from the ovary by the
process called ovulation
(iii) Relaxin, hCG and hPL are produced in
women only during pregnancy
(iv) During pregnancy, levels of hormones
like estrogens, progestogens, cortisol
and thyroxine are increased several
folds in the mother.
Which of these are correct?
a) (i) & (iii)
(b) (i), (ii) & (iv)
c) (iii) & (iv)
d) All are correct
Ans. (c)
Hint: Graffian follicle ruptures to release
secondary oocyte.
236. Both corpus luteum and macula lutea are:
(AIIMS – 2003)
a) Found in human ovaries
b) A source of hormones
c) Characterized by a yellow colour
d) Contributory in maintaining pregnancy
Ans. (c)
237. The phase of menstrual cycle in humans
that lasts for 7-8 days, is: (AIIMS – 2003)
a) Follicular phase
b) Ovulatory phase
c) Luteal phase
d) Menstruation
Ans. (a)
238. Which one of the following statements with
regard to embryonic development in humans
is correct?
(AIIMS – 2003)
a) Cleavage divisions bring about considerable
increase in the mass of protoplasm.
b) In the second cleavage division, one of
the two blastomeres usually divides a
little sooner than the second
c) With more cleavage divisions, the resultant
blastomeres become larger and larger
d) Cleavage division results in a hollow ball
of cells called morula
Ans. (b)
239. Assertion: Holoblastic cleavage with
almost equal sized blastomeres is a
characteristic of placental animals.
Reason: Eggs of most mammals, including
humans, are of centrolecithal type.
(AIIMS – 2003)
a) If both Assertion and Reason are true and
the Reason is the correct explanation of
the Assertion, then mark a.
b) If both Assertion and Reason are true but
the Reason is not the correct explanation
of the Assertion, then mark b.
c) If Assertion is true statement but Reason
is false, then mark c.
d) If both Assertion and Reason are false
statements, then mark d.
Ans. (c)
240. Which one of the following events is
correctly matched with the time period in a
normal menstrual cycle? (AIIMS – 2005)
a) Release of egg: 5th day.
b) Endometrium regenerates: 5 – 10 days
c) Endometrium secretes nutrients for
implantation: 11 – 18 days.
d) Rise in progesterone level: 1 – 15 days
Ans. (b)
241. Which of the following has the longest
gestation period
(AIIMS – 2010)
a) Man
b) Cat
c) Dog d) Elephant
Ans. (d)
Hint: In cats and dogs it is about 63. In man
280 days and in elephant 624 days.
242. Go through the following diagram carefully:
(AIIMS – 2010)
Which of the following option shows the correct
labelling and events occurring in that organ:
a) (i) Ovary – Follicle rupture; Beginning
of 1st and 2nd meiotic division
(ii) Fallopian tube – Fertilisation;
Completion of 2nd meiotic division
(iii) Uterus – Blastocyst formation;
Implantation
b) (i) Ovary – Follicle rupture; Completion of
2nd meiotic division
(ii) Fallopian tube – Fertilisation;
Blastocyst formation
(iii) Uterus - Implantation
c) (i) Ovary – Follicle maturation;
Beginning of 1st and 2nd meiotic division
(ii) Fallopian tube – Fertilisation;
Completion of 2nd meiotic division
(iii) Uterus – Beginning of cleavage; Implantation
d) (i) Ovary – Follicle maturation;
Completion of 2nd meiotic division
(ii) Fallopian tube – Beginning of cleavage;
Implantation
(iii) Uterus – Fertilisation; Blastocyst formation
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DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
Ans. (a)
243. Secretion of GnRH would lead to:
(AIIMS – 2010)
a) Secretion of testosterone leading to
mammary gland development
b) Release of prolactin leading to milk
production in mammary glands
c) Secretion of LH and FSH leading to
follicle development
d) All of the above
Ans. (c)
244.Find the odd one out:
(AIIMS – 2010)
a) HIV
b) Trichomoniasis
c) Gonorrhoea
d) Typhoid
Ans. (d)
Hint: (a), (b) and (c) are STDs.
245. Assertion: If scrotal sacs are removed,
testosterone is still found in the body.
Reason: Small amount of androgens is
secreted by the adrenal cortex.
(AIIMS – 2011)
a) If both Assertion and Reason are true and
the Reason is the correct explanation of
the Assertion, then mark a.
b) If both Assertion and Reason are true but
the Reason is not the correct explanation
of the Assertion, then mark b.
c) If Assertion is true statement but Reason is
false, then mark c.
d) If both Assertion and Reason are false
statements, then mark d.
Ans. (a)
246. The entry of additional sperms into the
ovum is prevented because of:
(AIIMS – 2011)
a) Release of secretions from the acrosome
b) Changes in the zona pellucida
c) Changes in the corona radiata
d) Contractions and secretions of the
fallopian tube
Ans. (b)
247. Ovulation in the human female normally
takes place during the menstrual cycle
(CBSE PRELIMS – 2004)
a) At the beginning of the proliferative phase
b) At the end of the proliferative phase
c) At the mid secretory phase
d) Just before the end of the secretory phase
Ans. (b)
248. Sertoli cells are regulated by the pituitary
hormone known as: (CBSE PRELIMS – 2006)
a) FSH
b) GH
c) Prolactin
d) LH
Ans. (a)
249. Withdrawl of which of the following
hormones is the immediate cause of
menstruation?
(CBSE PRELIMS – 2006)
a) Estrogen
b) FSH
c) FSH-RH
d) Progesterone
Ans. (d)
250. Which part of ovary in mammals acts as an
endocrine gland after ovulation
(CBSE PRELIMS – 2007)
a) Stroma
b) Germinal epithelium
c) Vitelline membrane d) Graffian follicle
Ans. (d)
251. In the human female, menstruation can be
deferred by the administration of:
(CBSE PRELIMS – 2007)
a) Combination of FSH and LH
b) Combination of estrogen and progesterone
c) FSH only
d) LH only
Ans. (b)
252. Compared to a bull a bullock is docile
because of
(CBSE PRELIMS – 2007)
a) Higher levels of cortisone
b) Lower levels of blood testosterone
c) Lower levels of adrenalin/noradrenalin
in its blood
d) Higher levels of thyroxin
Ans. (b)
253. In humans, at the end of the first meiotic
division, the male germ cells differentiate
into the:
(CBSE PRELIMS – 2008)
a) Spermatozonia
b) Primary spermatocytes
c) Secondary spermatocytes
d) Spermatids
Ans. (c)
254. Which extraembryonic membrane in
humans prevents desiccation of the embryo
inside the uterus? (CBSE PRELIMS – 2008)
a) Amnion
b) Chorion
c) Allantois
d) Yolk sac
Ans. (a)
255. Which one of the following statements is
incorrect about menstruation?
(CBSE PRELIMS – 2008)
a) The beginning of the cycle of
menstruation is called menarche.
b) During normal menstruation about 40 ml
blood is lost.
c) The menstrual fluid can easily clot.
d) At menopause in the female, there is
especially
abrupt
increase
in
gonadotropic hormones
Ans. (c)
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DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
256. In human adult females oxytocin:
(CBSE PRELIMS – 2008)
a) Causes strong uterine contractions
during parturition
b) Is secreted by anterior pituitary
c) Stimulates growth of mammary glands
d) Stimulates pituitary to secrete vasopressin
Ans. (a)
257. Which one of the following is the correct
matching of the events occurring during
menstrual cycle? (CBSE PRELIMS – 2009)
a) Development of
corpus luteum
b) Menstruation
c) Ovulation
d) Proliferative
phase
Secretory
phase
and
increased
secretion
of
progesterone.
Breakdown of myometrium
and ovum not fertilized.
LH and FSH attain peak level
and sharp fall in the secretion
of progesterone.
Rapid
regeneration
of
myometrium and maturation
of Graafian follicle.
Ans. (a)
258. The correct sequence of spermatogenetic
stages leading to the formation of sperms in
a mature human testis is:
(CBSE PRELIMS – 2009)
a) Spermatid-spermatocyte-spermatogoniasperms
b) Spermatogonia-spermatid-spermatocytesperms
c) Spermatocyte-spermatogonia-spermatidsperms
d) Spermatogonia-spermatocyte-spermatidsperms
Ans. (d)
259. Foetal ejection reflex in human female is
induced by:
(CBSE PRELIMS – 2009)
a) Fully developed foetus and placenta
b) Differentiation of mammary glands
c) Pressure exerted by amniotic fluid
d) Release of oxytocin from pituitary
Ans. (a)
260. Which one of the following is the most
likely root cause why menstruation is not
taking place in regularly cycling human
female?
(CBSE PRELIMS – 2009)
a) Maintenance of high concentration of
sex-hormones in the blood stream
b) Retention of well-developed corpus luteum
c) Fertilisation of the ovum
d) Maintenance of the hypertrophical
endometrial lining
Ans. (c)
261. Given below is a diagrammatic sketch of a
portion of human male reproductive system.
Select the correct set of the names of the
parts labelled A, B, C, D:
(CBSE PRELIMS – 2009)
A
B
C
a) Vas
deferens
b) Ureter
Bulbourethrall gland
Prostate
c) Ureter
Seminal
vesicle
Seminal
vesicle
Prostate
d) Vas
deferens
Seminal
vesicle
Seminal
vesicle
Prostate
D
Prostate
Bulbourethral gland
Bulbourethral gland
Bulbourethrall gland
Ans. (d)
262. A change in the amount of yolk and its
distribution in the egg will affect:
(CBSE PRELIMS – 2009)
a) Number of blastomeres produced
b) Fertilization
c) Formation of zygote
d) Pattern of cleavage
Ans. (d)
263. Seminal plasma in humans is rich in:
(CBSE PRELIMS – 2009)
a) Glucose and certain enzymes but has
no calcium
b) Fructose and certain enzymes but poor
in calcium
c) Fructose, calcium and certain enzymes
d) Fructose and calcium but has no enzymes
Ans. (c)
Hint: Seminal plasma is the term used for
semen. Calcium is present in prostatic
secretion.
264. Vasa efferentia are the ductules leading
from:
(CBSE PRELIMS – 2010)
a) Epididymis to urethra
b) Testicular lobules to rete testis
c) Rete testis to vas deferens
d) Vas deferens to epididymis
Ans. (c)
Hint: The path followed by sperms is
seminiferous tubules  tubuli recti  rete
testis  Vasa efferentia  epididmis 
vas deferens  ejaculatory duct  urethra.
21
DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
None of the above options is correct. The
best option seems to be (c).
265. The first movements of the foetus and
appearance of hair on its head are usually
observed during which month of pregnancy?
(CBSE PRELIMS – 2010)
a) Third month
b) Fourth month
c) Fifth month
d) Sixth month
Ans. (c)
266. Which one of the following statements
about human sperm is correct?
(CBSE PRELIMS – 2010)
a) Acrosome serves no particular function
b) Acrosome has a conical pointed structure
used for piercing and penetrating the egg
resulting in fertilization
c) The sperm lysins in the acrosome dissolve
the egg envelope facilitating fertilization
d) Acrosome serves as a sensory structure
leading the sperm towards the ovum
Ans. (c)
267. Seminal plasma in human males is rich in:
(CBSE PRELIMS – 2010)
a) Ribose and potassium
b) Fructose and calcium
c) Glucose and calcium
d) DNA and testosterone
Ans. (b)
Hint: Fructose is mainly present in secretions
of seminal vesicles and calcium in
prostatic secretions.
268. Sertoli cells are found in:
(CBSE PRELIMS – 2010)
a) Pancreas and secrete cholecystokinin
b) Ovaries and secrete progesterone
c) Adrenal cortex and secrete adrenaline
d) Seminiferous tubules and provide
nutrition to germ cells
Ans. (d)
269. The part of Fallopian tube closest to the ovary
is:
(CBSE PRELIMS – 2010)
a) Ampulla
b) Isthmus
c) Infundibulum
d) Cervix
Ans. (c)
270. The signals for parturition originate from:
(CBSE PRELIMS – 2010)
a) Fully developed foetus only
b) Placenta only
c) Placenta as well as fully developed foetus
d) Oxytocin released from maternal pituitary
Ans. (c)
271. The second maturation division of the
mammalian ovum occurs:
(CBSE PRELIMS – 2010)
a) In the Graafian follicle following the first
maturation division
b) Shortly after ovulation before the ovum
makes entry into the Fallopian tube
c) Until after the ovum has been
penetrated by a sperm
d) Until the nucleus of the sperm has
fused with that of the ovum
Ans. (c)
272. Which one of the following statements
about morula in humans is correct?
(CBSE PRELIMS – 2010)
a) It has more cytoplasm and more DNA
than an uncleaved zygote
b) It has almost equal quantity of cytoplasm
as an uncleaved zygote but much more
DNA
c) It has far less cytoplasm as well as less
DNA than in an uncleaved zygote
d) It has more or less equal quantity of
cytoplasm and DNA as in uncleaved zygote
Ans. (b)
273. If for some reason, the vasa efferentia in the
human reproductive system get blocked, the
gametes will not be transported from:
(CBSE PRELIMS – 2011)
a) Testes to epididymis
b) Epididymis to vas deferens
c) Ovary to uterus
d) Vagina to uterus
Ans. (a)
274. The testes in humans are situated outside
the abdominal cavity inside a pouch called
scrotum. The purpose served is for:
(CBSE PRELIMS – 2011)
a) Maintaining the scrotal temperature lower
than the internal body temperature
b) Escaping any possible compression by
the visceral organs
c) Providing more space for the growth of
epididymis
d) Providing a secondary sexual feature for
exhibiting the male sex
Ans. (a)
275. The figure given below depicts a
diagrammatic sectional view of the female
reproductive system of humans. Which one
set of three parts out of I-VI have been
correctly identified?
(CBSE PRELIMS – 2011)
22
DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
a) (II) Endometrium, (III) Infundibulum, (IV)
Fimbriae
b) (III) Infundibulum, (IV) Fimbriae, (V) Cervix
c) (IV) Oviducal funnel, (V) Uterus, (VI) Cervix
d) (I) Perimetrium, (II) Myometrium, (III)
Fallopian tube
Ans. (b)
276. What is correct to say about the hormone
action in humans? (CBSE PRELIMS – 2012)
a) Secretion of thymosins is stimulated
with aging
b) In females, FSH first binds with specific
receptors on ovarian cell membrane
c) FSH stimulates the secretion of
estrogen and progesterone
d) Glucagon is secreted by β-cells of Islets of
Langerhans and stimulates glycogenolysis
Ans. (b)
277. In a normal pregnant woman, the amount
of total gonadotropin activity was assessed.
(CBSE PRELIMS – 2012)
The result expected was:
a) High level of circulating HCG to
stimulate endometrial thickening
b) High levels of FSH and LH in uterus to
stimulate endometrial thickening
c) High level of circulating HCG to stimulate
estrogen and progesterone synthesis
d) High level of circulating FSH and LH in
the uterus to stimulate implantation of
the embryo
Ans. (c)
278. Signals for parturition originate from
(CBSE PRELIMS – 2012)
a) Oxytocin released from maternal pituitary
b) Placenta only
c) Fully developed foetus only
d) Both placenta as well as fully developed
foetus
Ans. (d)
279. The Leydig cells as found in the human
body are the secretory source of:
(CBSE PRELIMS – 2012)
a) Intestinal mucus
b) Glucagon
c) Androgens
d) Progesterone
Ans. (c)
280. Which one of the following statements is
false in respect of viability of mammalian
sperm?
(CBSE PRELIMS – 2012)
a) Survival of sperm depends on the pH of
the medium and is more active in
alkaline medium
b) Viability of sperm is determined by its
motility
c) Sperms must be concentrated in a thick
suspension
d) Sperm is viable for only up to 24 hours
Ans. (d)
281. Signals from fully developed foetus and
placenta ultimately lead to parturition which
requires the release of
(CBSE MAINS – 2010)
a) Estrogen from placenta
b) Oxytocin from maternal pituitary
c) Oxytocin from foetal pituitary
d) Relaxin from placenta
Ans. (b)
282. In human female the blastocyst
(CBSE MAINS – 2010)
a) Forms placenta even before implantation
b) Gets implanted into uterus 3 days after
ovulation
c) Gets nutrition from uterine endometrial
secretion only after implantation
d) Gets implanted in endometrium by the
trophoblast cells
Ans. (d)
283. Secretions from which one of the following
are rich in fructose, calcium and some
enzymes?
(CBSE MAINS – 2010)
a) Male accessory glands
b) Liver
c) Pancreas
d) Salivary glands
Ans. (a)
284. What happens during fertilisation in humans
after many sperms reach close to the ovum?
(CBSE MAINS – 2011)
a) Secretions of acrosome helps one sperm
enter cytoplasm of ovum through zona
pellucida
b) All sperms except the one nearest to the
ovum lose their tails
c) Cells of corona radiata trap all the sperms
except one
d) Only two sperms nearest the ovum
penetrate zona pellucida
Ans. (a)
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DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
285. About which day in a normal human
menstrual cycle does rapid secretion of LH
(popularly called LH-surge) normally occurs?
(CBSE MAINS – 2011)
a) 14th day
b) 20th day
th
c) 5 day
d) 11th day
Ans. (a)
286. The secretory phase in the human
menstrual cycle is also called:
(CBSE MAINS – 2012)
a) Luteal phase and lasts for about 13 days
b) Follicular phase and lasts for about 13
days
c) Luteal phase and lasts for about 6 days
d) Follicular phase and lasting for about 6
days
Ans. (a)
287. Identify the human development stage
shown below as well as the related right
place of its occurrence in a normal pregnant
woman, and select the right option for the
two together.
(CBSE MAINS – 2012)
Options:
Developmental stage
a) Blastocyst
b) 8-celled morula
c)
d)
Late morula
Blastula
Site of occurrence
Uterine wall
Starting point of Fallopian
tube
Middle part of Fallopian tube
End part of Fallopian tube
Ans. (a)
Hint: The embryo with 8-16 blastomeres is called
a morula, and is present in the end part of
fallopian tube. Morula forms the blastocyst as
it reaches the uterine cavity and then
blastocyst implants in the endometrium.
Thus, the options (b), (c), (d) are all wrong.
288. Which hormone is detected in urine as
pregnancy test?
(CHD. CET – 2008)
a) hCG
b) Estrogen
c) Progesterone
d) Luteinising hormone
Ans. (a)
289. Bartholin glands are situated
(CHD. CET – 2008)
a) On the sides of head of some amphibians
b) At the reduced tail end of birds
c) On either side of vagina in humans
d) On either side of vas deferens in humans
Ans. (c)
290. Placenta in human beings is formed by
(CHD. CET – 2008)
a) Amnion
b) Chorion
c) Allantois
d) Chorion and Allantois
Ans. (b)
291. The progesterone is secreted by:
(CHD. CET – 2009)
a) Graffian follicles
b) Corpus luteum
c) Interstitial cells
d) Corpus albicans
Ans. (b)
292. Testosterone, the male sex hormone is
synthesized in the:
(CHD. CET – 2009)
a) Seminiferous tubules
b) Interstitial cells
c) Vas deferns
d) Prostate gland
Ans. (b)
293. Metadiscoidal placenta is found in:
(CHD. CET – 2010)
a) Pig
b) Rabbit
c) Humans
d) Cow
Ans. (c)
Hint: Pig has diffused non-deciduous placenta.
Cow has cotyledonary non-deciduous
placenta. Rabbit has discoidal deciduous
placenta.
294. Which gland secretes alkaline mucous in the
urethra to neutralize the acidity of urine?
(CHD. CET – 2011)
a) Prostrate gland
b) Cowper’s gland
c) Seminal vesicles
d) Preputial glands
Ans. (b)
295. A temporary endocrine gland in humans is:
(CHD. CET – 2012)
a) Islets of Langerhans
b) Pineal body
c) Corpus Luteum
d) Corpora allata
Ans. (c)
296. Braxton Hicks contractions occur during:
(CHD. CET – 2012)
a) Passage of food through alimentary canal
b) Peristaltic movements
c) Pregnancy
d) Lactation
Ans. (c)
297. The correct sequence of human embryonic
development is:
(CHD. CET – 2012)
a) Blastocoel – gastrocoel – neural crest –
notochord
b) Gastrocoel – blastocoel – notochord –
neural crest
c) Gastrocoel – blastocoel – neural crest –
notochord
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DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
d) Blastocoel – neural crest – gastrocoel –
notochord
Ans. (a)
298. The onset of menstrual cycle in females of
anthropoid primates is known as:
(CHD. CET – 2012)
a) Puberty
b) Menarche
c) Menopause
d) Menstruation
Ans. (b)
299. Thick yellow high protein fluid produced
by the mammary glands of a woman
during first 2-3 days after child birth is
known as:
(CHD. CET – 2012)
a) Meconium
b) Hymen
c) Cumulus oophorous
d) Colostrum
Ans. (d)
300. Location and Secretions of Leydig cells are
(H.P. PMT – 2010)
a) Liver – Cholesterol
b) Ovary – Estrogen
c) Testis – Androgens
d) Pancreas – Glucagon
Ans. (c)
301. Which hormones are produced in women
only during pregnancy?
(H.P. PMT – 2010)
a) human chorionic Gonadotropin (hcG)
b) human placental Lactogen (hpL)
c) Relaxin
d) All the above
Ans. (d)
302. The menstrual phase is followed by
(H.P. PMT – 2010)
a) Luteal phase
b) Follicular phase
c) Fertilization
d) Implantation
Ans. (b)
303. Which layer of uterus undergoes cyclical
changes during menstrual cycle?
(H.P. PMT – 2011)
a) Perimetrium
b) Myometrium
c) Endometrium
d) All the above
Ans. (c)
304. Which type of Germ cells contains 23
chromosomes?
(H.P. PMT – 2011)
a) Spermatogonia
b) Secondary spermatocytes
c) Primary spermatocytes
d) None of the above
Ans. (b)
305. In human beings, Menstrual cycle ceases
around 50 years of age that is termed as
(H.P. PMT – 2011)
a) Menarche
b) Diapause
c) Menopause
d) None of the above
Ans. (c)
306. Generally the first movement of the human
foetus in the womb is noticed during
(H.P. PMT – 2012)
a) Ist month
b) 3rd month
th
c) 5 month
d) 8th month
Ans. (c)
307. The hormone secreted by corpus luteum is
(H. P. PMT – 2012)
a) Luteinizing hormone
b) Estrogen
c) Follicle stimulating hormone
d) Progesterone
Ans. (d)
308. The internal cavity commonly formed by
cell division prior to gastrulation is the
(DUMET – 2010)
a) Enteron
b) Blastopore
c) Blastocoel
d) Coelom
Ans. (c)
309. The number of autosomes in human
primary spermatocyte is (DUMET – 2011)
a) 46
b) 44
c) 23
d) 22
Ans. (b)
310. Which of the following organs is devoid of
glands?
(DUMET – 2011)
a) Uterus
b) Vagina
c) Vulva
d) Oviduct
Ans. (b)
311. Primary
spermatocyte
differs
from
spermatogonium in
(DUMET – 2011)
a) Number of chromosomes
b) Size and volume
c) DNA content
d) Size of chromosomes
Ans. (b)
Hint: Primary spermatocytes are about double
the volume of spermatogonia as they
formed as a result of growth phase.
312. In human, cleavage divisions are
(DUMET – 2011)
a) Slow and synchronous
b) Fast and synchronous
c) Slow and asynchronous
d) Fast and asynchronous
Ans. (c)
313. What is the correct sequence of sperm
formation?
(NEET – 2013)
a) Spermatogonia,
spermatozoa,
spermatocyte, spermatid
b) Spermatogonia, spermatocyte, spermatid,
spermatozoa
c) Spermatid, spermatocyte, spermatogonia.
spermatozoa
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DR. ARVIND’S BIOLOGY CLASSES
(A UNIT OF MED-XEL TUTORIALS)
d) Spermatogonia,
spermatocyte,
spermatozoa, spermatid
Ans. (b)
314. Which one of the following is not the
function of placenta? It:
(NEET – 2013)
a) Facilitates removal of carbon dioxide
and waste material from embryo.
b) Secretes oxytocin during parturition.
c) Facilitates supply of oxygen and
nutrients to embryo.
d) Secretes estrogen.
Ans. (b)
315. Product of sexual reproduction generally
generates:
(NEET – 2013)
a) New genetic combination leading to
variation
b) Large biomass
c) Longer viability of seeds
d) Prolonged dormancy
Ans. (a)
316. Menstrual flow occurs due to lack of:
(NEET – 2013)
a) Oxytocin
b) Vasopressin
c) Progesterone
d) FSH
Ans. (c)