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ICSE-X BIOLOGY 2010
SECTION - I (40 Marks)
(Attempt all questions from this Section)
Question 1.
(a) Name the following :
(i) The type of cell division which occurs in the cells of the reproductive
organs.
(ii) A plant with sunken stomata.
(iii) A foreign body that induces the formation of antibodies in the body.
(iv) The place where fertilization occurs in the female reproductive system.
(v) An organization that looks after maternal and child welfare centres. [5]
(b) State whether the following statements are true or false. If false, rewrite the
correct form of the statement by changing the first or last word only.
(i) Tubectomy is the surgical method of sterilisation in males.
(ii) Mitosis is the type of cell division occurring in the cells of injured parts
of the body.
(iii) Photolysis is the process of splitting of water molecules in the presence
of grana and temperature.
(iv) Dilation of the pupil is brought about by the sympathetic nervous
system.
(v) Chromosomes other than the pair of sex chromosome are called alleles. [5]
(c) Given below are five sets of five terms each. In each case, rewrite the terms
in logical sequence as directed at the end of each statement.
One has been done for you as an example.
Example: Anaphase,
Telophase, Prophase, Metaphase, Interphase.
(sequential order of Karyokinesis)
Answer : Interphase, Prophase, Metaphase, Anaphase, Telophase.
(i) Vagina, Ovary, Uterus, Oviduct, Cervix, (pathway of egg after
ovulation)
(ii) Motor Neuron, Receptor, Sensory Neuron, Effector, Association
Neuron, (pathway of a nerve impulse)
(iii) Pupil, Yellow Spot, Cornea, Lens, Aqueous humour, (path of entry of
light into the eye from an object)
(iv) Stoma, Mesophyll cells, Xylem, Substomatal space, Intercellular space.
(loss of water due to transpiration)
(v) Cortical cells, root hair, soil, water, endodermis, xylem. (entry of water
into the plant from the soil)
(d) There are five sets consisting of five terms given below. In each set there is a
word which is an odd one. For each of these sets write down the category of
the group having identified the odd one out, as shown in the example :
Example : (0) cell wall, vacuole, centrosome, plastids, mitochondria.
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S. No.
Category
Odd One
0
Organelles of Plant Cell
Centrosome
(i) Blinking, Knitting without looking, Smiling, Blushing, Crying.
(ii) Myopia, Cataract, Hypermetropia, Squint, Cretinism.
(iii) Cowper's gland, Urethral gland, Lachrymal gland, Seminal vesicles,
Prostrate gland.
(iv) Vasopressin, Growth hormone, TSH, ACTH, FSH.
(v) Cresol, DDT, Lime, Mercurochrome, Bordeaux mixture.
[5]
(e) Choose the correct answer to the following statements out of the three
choices given after each statement.
(i) A point of contact between two neurons is termed :
1. Synopsis 2. Neuro motor junction 3. Synapse,
(ii) Loss of water as droplets from hydathodes is called :
I. Transpiration. 2. Bleeding. 3. Guttation.
(iii) The technical term for the fertilized egg is :
1. Placenta. 2. Zygote. 3. Morula.
(iv) The photo receptor cells of the retina sensitive to colour are :
1. Cones.
2. Rods.
3. Organ of Corti.
(v) Salk's vaccine is used to build immunity against:
1. Tuberculosis.
2. Poliomyelitis.
3. Malaria.
(f) The figure below represents an experiment
set up to study a physiological process in
plants :
(i) Name the physiological process being
studied.
(ii) Explain the process.
(iii) What is the aim of the experiment ?
(iv) Give a well balanced equation to
represent the process.
[5]
(g) Given below is an example of a certain
structure and its special functional
activity : Example : (0) Ribosomes and
Protein synthesis. On a similar pattern
complete the following:
(i) Hypothalamus and ……………..
(ii) Suspensory ligaments and ……………..
(iii) Semi circular canals and ……………..
(iv) Mitochondria and ……………..
(v) Seminiferous tubules and ……………..
(h) Explain the following terms:
(i) Antibiotics
(ii) Antiseptic
(iii) Hormones
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(iv) Diffusion
(v) Destarched plant
Answer 1.
(a) (i) Meiosis
(ii) Nerium
(iii) Antigens
(iv) Oviduct
(v) Red cross.
(b) (i) False, Vasectomy is the surgical method of sterilisation in males.
(ii) True.
(iii) False, Photolysis is the process of splitting of water molecules in the
presence of grana and light.
(iv) True.
(v) False, Chromosomes other than the pair of sex chromosomes are called
autosomes.
(c) (i) Ovary  Oviduct  Uterus  Cervix  Vagina.
(ii) Receptor  Sensory Neuron  Association Neuron  Motor Neuron
 Effector.
(iii) Cornea  Aqueous Humour  Pupil  Lens  Yellow Spot.
(iv) Xylem  Mesophyll Cells  Intercellular Space  Substomatal
Space  Stoma.
(v) Soil water  Root Hair  Cortical Cells  Endodermis  Xylem.
(d)
S. No.
Category
Odd One
(i)
Simple reflex
Knitting without looking
(ii)
Diseases of eye
Cretinism
(iii)
Associated with male reproductive Lachrymal gland
parts
(iv)
Hormones from anterior pituitary
Vasopressin
(v)
Disinfectants
Mercurochrome.
(e) (i)
(iv)
(f) (i)
(ii)
Synapsis
(ii) Guttation
(iii) Zygote
Cones
(v) Photosynthesis.
Poliomyelitis.
It is the process in which green plants manufacture food from carbondioxide and water, in presence of sunlight
(iii) To show that oxygen is given out during photosynthesis.
Light
(iv) 6CO2  12H 2O 
 C6 H12o6  6H 2O  6O2
Chlorophyll
(g) (i)
(ii)
(iii)
(iv)
(v)
(h) (i)
control body temperature.
hold eye lens in position.
dynamic balance.
cellular respiration.
produce sperms.
Antibiotics - These are chemicals produced by living micro-organisms
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(ii)
(iii)
(iv)
(v)
and which kill other harmful micro-organisms.
Antiseptic - It is a chemical which is applied on skin to kill or inhibit the
growth of other micro-organisms.
Hormones - These are chemicals produced by ductless glands into blood
and which act on target organs.
Diffusion - It is the movement of molecules of any type, from their high
to their low concentration.
Destarched plant - It is the plant in which starch has been removed from
the leaves.
SECTION— II (40 Marks)
Attempt any four questions from this Section.
Question 2.
(a) Given below is the outline of the male
reproductive system:
(i) Name the parts labelled 1 to 5.
(ii) State the functions of the parts
labelled 1 and 4.
(iii) Name the cells of part 5 that produce
testosterone.
(iv) Why is the structure 5 present
outside the body in the scrotal sacs ?
(v) What is semen ?
[5]
(b) Give one point of difference between the following on the basis of what is
given in the brackets :
(i) Myopia and Hypermetropia. (cause of the defect)
(ii) Cerebrum and Spinal cord, (arrangement of cytons and axons of neuron)
(iii) Genotype and Phenotype. (definition)
(iv) Karyokinesis and Cytokinesis, (explain the term)
(v) Light reaction and Dark reaction, (site of occurrence)
Answer 2.
(a) (i) 1. Prostate gland.
2. Cowper's gland.
3. Urethra.
4. Sperm duct.
5. Testis.
(ii) 1.
Prostate gland - It secretes an alkaline matter which neutralizes
the acidity of urethra.
4.
Sperm duct - It carries sperms from epididymis to the urethra
(iii) Cells of Leydig.
(iv) Testis are located in the scrotal sacs so that they can maintain a low
temperature than the body cavity. This low temperature is necessary for
the maturation of sperms.
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(v) Semen is the mixture of sperm and
prostate gland and cowper's gland.
(b) (i)
Myopia
Eye ball lengthened from front to
back.
(ii)
Cerebrum
Cyton outside and axons inside.
(iii)
Genotype
It is the genetic constitution.
secretions of the seminal vesicles,
Hypermetropia
Eye ball shortened from front to
back.
Spinal Cord
Axons outside and cytons inside.
Phenotype
These are the observable
characters controlled by genes.
(iv)
Karyokinesis
It is the division of nucleus.
Cytokinesis
It is the division of cytoplasm
during cell division.
(v)
Light reaction
In grana.
Dark reaction
In stroma of chloroplast.
Question 3.
(a) (i) State Mendel's Law of Dominance.
(ii) A pure tall plant (TT) is crossed with a pure dwarf plant (tt).
Draw Punnett squares to show (1) F1 generation (2) F2 generation.
(iii) Give the Phenotype of the F2 generation.
(iv) Give the Phenotypic and Genotypic ratio of the F1 and F2 generation.
(v) Name any one X-linked disease found in humans.
[5]
(b) Answer the following briefly:
(i) Three functions of WHO.
(ii) Three advantages of a small family.
(iii) Explain the terms :
(1) Population density.
(2) Natality.
[5]
Answer 3.
(a) (i) Law of Dominance : Out of a pair of contrasting characters present
together, one is able to express itself while the other remains suppressed
(ii)
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(iii) In F2 generation 75% plants will be tall and 25% dwarf.
(iv) F1
Phenotypic ratio - all tall plants.
Genotypic ratio - all hybrids.
F2
Phenotypic ratio - 3 : 1
Genotypic ratio - 1 : 2 : 1
(v) Haemophilia.
(b) (i) 1. To collect and provide information about the occurrence of diseases
of epidemic nature.
2. To promote and support projects for research on diseases.
3. To provide information on developments about researches and
nutritional discoveries.
(ii) 1. Less economic pressure on parents.
2. Better living conditions.
3. Proper education can be given to all.
(iii) 1. Population density : It is the number of individuals living per square
kilometre at a given time.
2. Natality : It is the number of live births per 1000 of population per
year.
Question 4.
(a) Given below is a diagram of a double
helical structure of DNA:
(i) Name the four nitrogenous bases that
form a DNA molecule
(ii) Give the full form of DNA.
(iii) Name the unit of heredity
(iv) Mention two points of difference
between Mitosis and Meiosis.
[5]
(b) (i) Draw a well labelled diagram of a
Neuron showing the following parts:
Perikaryon, Dendrites, Axon, Node
of Ranvier and Myelin sheath.
(ii) State the function of sensory neuron and a motor neuron.
(iii) What is a nerve made up of ?
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Answer 4.
(a) (i) Guanine, Thymine, Adenine, Cytosine.
(ii) De-oxy ribonucleic acid,
(iii) Gene
(iv)
Mitosis
Meiosis
1. Two daughter cells are
Four daughter cells are produced
produced
Haploid cells are produced.
2. Diploid cells are produced.
(b) (i)
(ii) Sensory neuron transmits impulses from sense organs to the central
nervous system.
Motor neuron carry impulses from the central nervous system to the
effector organs
(iii) Nerve is made up of a bundle of nerve fibres enclosed in a sheath.
Question 5.
(a) Given below is the diagram of an apparatus set up to
study a very important physiological process :
(i) Name the process being studied.
(ii) Explain the process.
(iii) What change would you observe in the thistle
funnel containing sugar solution after about 10
minutes ?
(iv) Is sugar solution hypertonic or hypotonic ?
(v) Name the part of the plant cell which is
represented by the sugar solution
(vi) Explain why much salt is added to pickles. [5]
(b) Explain the fallowing terms :
(i) Reflex action
(ii) Vaccination
(iii) Turgidity
(iv) Bleeding in plants.
(v) Cataract.
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Answer 5.
(a) (i) Osmosis.
(ii) It is the movement of solvent molecules from a solution of their high
concentration to their low concentration solution across of semipermeable membrane
(iii) Level of solution will rise.
(iv) Hypertonic.
(v) Cell sap.
(vi) Much salt is added to pickles so that a hypertonic solution is formed
around the vegetable pieces. Any fungi etc attacking the preserved food
will die due to plasmolysis by the solution.
(b) (i) Reflex action - It is a quick, automatic and spontaneous action in the
body caused by a stimulus.
(ii) Vaccination - It is the introduction of germ substances into the body to
develop immunity against a disease.
(iii) Turgidity - It is the condition of cell which is fully distend and filled
with water.
(iv) Bleeding in plants - It is the loss of sap from a cut or injured part of a
plant.
(v) Cataract - A condition when in old age, the eye lens turn opaque causing
blindness.
Question 6.
(a) Given below is an outline of the human body
showing
the
important
glands.
(i) Name the glands marked 1 to 5.
(ii) Name the hormone secreted by 2.
Give one important function of this
hormone.
(iii) Name the endocrine cells present in part 3.
(iv) Name the hormone secreted by Testis in
males part 4.
Give one important function of this
hormone.
[5]
(b) Give the biological/technical term for the
following:
(i) Cessation of menstruation in females
(ii) An eye defect in which the cornea
becomes uneven.
(iii) The period of complete intrauterine
development of the embryo.
(iv) Inflammation of meninges.
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(v) Non identical twins produced by the fertilization of two eggs.
(vi) Membrane that protects the foetus and secretes a protective fluid
(vii) Process of conversion of several molecules of glucose to one molecule
of starch.
(viii) The photosensitive pigment present in the cone cells of the retina
(ix) The fluid present in the anterior part in front of the eye lens.
(x) Extracts of toxins secreted by bacteria.
[5]
Answer 6.
(a) (i) 1. Pituitary. 2. Thyroid.
3. Pancreas. 4. Adrenal.
5. Ovary
(ii) Thyroxine.
It regulates the basal metabolism
(iii) Islets of Langerhans.
(iv) Adrenalin.
It prepares the body for some emergency by causing production of
glucose from glycogen in liver, and releasing it into blood.
(b) (i) Menopause,
(ii) Astigmatism.
(iii) Gestation
(iv) Meningitis.
(v) Fraternal twins
(vi) Amnion.
(vii) Polymerization
(viii) lodopsin.
(ix) Aqueous humour
(x) Toxoids.
Question 7.
(a)
Given below is a diagram representing a
stage during mitotic cell division in an
animal cell :
(i) Identify the above stage. Give a reason
to support your answer
(ii) Name the parts labelled 1,2,3 and 4.
(iii) What is the function of part 3 ?
(iv) Name the stage that comes just after the
stage shown in the diagram. Draw a
well labeled diagram of this stage.
[5]
(b) Account for the following :
(i) Wilted lettuce leaves become crisp/firm when placed in cold water for a
while.
(ii) One feels blinded for a short time while coming out of a dark room.
(iii) The leaves of certain plants roll up on a bright sunny day.
(iv) An alcoholic person walks unsteadily when drunk
(v) Sleeping under a tree at night is not advisable.
[5]
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Answer 7.
(a) (i) Prophase. The nuclear membrane is disappearing,
(ii) 1. Asters.
2. Chromatid.
2. Centromere.
4. Spindle fibres
(iii) '3' joins the two chromatids of the chromosome
(iv) Metaphase.
(b) (i)
(ii)
(iii)
(iv)
(v)
Wilted lettuce leaves have hypertonic cell sap. When placed in cold
water endosmosis occurs in them and the plasmolysed cells become
turgid and the leaves become crisp.
In the dark the iris is wide open to let in more light. Also the pigment
visual purple is built up in more amount. As we come out in bright light
the visual purple is bleached and iris muscles contract to diminish the
pupil. Till this happens, one feels blinded in light.
On a bright sunny day leaves roll up to decrease the area of leaf. This
helps to reduce transpiration from the reduced surface.
Alcohol affects the cerebellum which co-ordinates muscular activities.
Due to alcohol the cerebellum is not able to function properly and the
leg movements appear unsteady.
Sleeping under a tree is not advisable because at night transpiration
almost stops at night and only respiration occurs in plants and they
release carbon dioxide. This makes the air under the trees stale. Hence it
is not advisable to sleep under the trees.
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