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Ambassador School, Dubai
Model paper
Std: X
Reading time: 15 mins
Max marks: 80
Writing time: 2hrs
Sub: Biology
Portion: Cell division, Pollution, Absorption by roots, Aids to health, Health organization,
Transpiration, Nervous system, Sense organs and Endocrine system
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General Instructions
Answer to this paper must be written on the paper provided separately.
Attempt all questions from section I and any four questions from section II.
The intended marks for questions or parts of questions are given in brackets [
]
Section I ( 40 marks)
Question:1
a)Name the following:
[ 5 marks]
1) The chemical substance which constitutes genes.
2) A bony socket in which eye is well protected
3) The membrane covering the brain and spinal cord.
4)A mixed gland.
5) A hormone that controls the basal metabolic rate.
b) Complete the following terms by filling in the appropriate term. [5marks]
1) The glands with duct are called ____________.
2) Cochlea is filled with __________.
3) Organ of hearing is _________________.
4) The cavities of the brain are called ________________.
5) The protein binds the genes with chromatin thread is called ___________.
c) Match the items in column I with those in column II.
[5 marks]
i)Cretinism
-
Excess of glucose in blood
ii)Diabetes melitus
-
Dwarfism and mental retardation
iii)Insulin shock
-
Over secretion of thyroxine
iv)Gigantism
-
Shortage of glucose in blood
v)Exopthalmicgoitre
-
Over secretion of growth hormone
-
undersecretion of thyroxine
-
Oversecretion of cortical hormone
d) Mention whether the following statements are true or false. If false, rewrite
the statements by changing the bold letters alone.
[5 marks]
i) Adrenal cortex secretes emergency hormone.
ii) Myxodema is caused due to the malfunctioning of thyroid gland.
iii) Deafness is caused due to the rupturing of the pinna.
iv) Salivation at the smell of food is a natural reflex.
v) The two arms of a chromosome is called centromere.
e) Given below is an example of a certain structure and special functional
activity with which is concerned.
[ 5 marks]
For example: Root and absorption of water
On a similar patter, fill in the blanks in the following pairs to represent
relationships between the structures and their function activities.
i)Semicircular canal and ___________________
ii) Iris and __________________
iii) Thalamus and ___________________.
iv) Oxytocin and _________________.
v) Chromosome and ____________________.
f) Draw a diagram of vertical section of the human eye and label the parts
which suit the following functions or descriptions.[5 marks]
i) The layer which prevents reflection of light
ii) The structure that alters the focal length of the lens.
iii) The region of distinct vision.
iv) The outermost transparent layer infrontof the eye lens.
v) The part which transmits the impulse to the brain
vi) The fluid present in the anterior part of the eye in front of the eye lens.
vii) A small opening in the centre of iris.
viii) The structure that protects the eyeball and maintains the shape
g) Complete the table:
[ 5 marks]
Secretion
Effect of hyposecretion
Thyroxine
1
Insulin
3
Growth hormone
Dwarfism
h) Name the hormone :[ 5 marks]
Effect of hypersecretion
2
4
5
i) Which is associated with the metabolism of carbohydrates,proteins , calcium and
phosphorus.
ii) Which controls the calcium content in blood plasma and its metabolism
iii) Which promotes the re-absorption of water from nephrons
iv) Which increases blood glucose level
v) Which prepares the body to face the emergency situation
Section II ( 40 marks)
Answer any four questions from this section
Question: 2
a.Given below is an experimental set up. Observe it carefully and then answer carefully.
i) What is the aim of experiment?
ii) Define the process being studied.
iii) What would you observe in the experimental set-up for comparision?
iv) What control experiment can be set up for this experiment?
v) Keeping in mind the root hair cell and its surrounding, name the part that corresponds
to i) concentrated sugar solution ii) parchment paper iii) Water in the beaker
vi) Name any other substance that can be used instead of egg membrane in the above.
vii) Mention two advantages of this process to the plant.
b) Define the following biological terms:
[5 marks]
i) Antitranspirants 2) Eutrophication 3) Cataract 4) Impulse 5) Homologous
chromosomes
Question:3
a)The diagram given below is the external view of the human brain. Study the
same and answer the questions that follow.
[5 marks]
i)Name the parts labeled 1 to 4.
ii) State the main functions of the parts labeled 1 and 2.
iii) How are the brain cells arranged in the part labeled ‘1’?
iv) What is the corpus callosum?
v) Name the fluid that surrounds the brain. State any one function of it.
b) Give one point of difference between the following pairs on the basis of
brackets indicated.
[5 marks]
i) Turgor pressure and Wall pressure (definition)
ii) Rods and cones (Pigment and function)
iii) Sympathetic and para sympathetic nervous system (definition and function)
Question: 4
a) Given below is the diagram of an experimental set-up to study the process of
transpiration in plants. Study the same and then answer the following questions:
i) What is the colour of the dry cobalt chloride paper?
ii) Is the experiment leaf a monocot or a dicot leaf? Give a reason to support your answer.
iii) Why are glass slides placed over the dry cobalt chloride paper?
iv) After about half an hour what change, if any would you expect to find in the cobalt chloride
paper placed on the dorsal and ventral side of the leaf? Give a reason to support your answer.
b) Give any one scientific reason for the following facts:
[5 marks]
i) The sex of child depends upon its father.
ii) Normally male child suffers from colour blindness.
iii) Injury to the medulla oblongata results in death.
iv) On entering a poorly lit room, one feels blinded for a short while.
v) The pituitary gland is known as the ‘Master gland’.
Question : 5
a)The sketch given below is a certain condition in an individual.[5 marks]
i)Name the condition
ii) What is the underlying cause of this condition?
iii) Name two other conditions that could have resulted due to a similar cause.
iv) Name the mineral required to cure above such conditions.
v) Name the hormone that controls the thyroid gland.
b) Choose the odd one in each of the following and write the reason for your
answer:[ 5marks ]
i) GH, ACTH, ADH, TSH
ii) Simple goiter, Diabetes, Cretinism, Myxodema
iii) Thyroxine, Progesterone, Vasopressin,Corpusluteum
iv) Insulin, Glucagon, Diabetes insipidus, Diabetes mellitus
v) Goitre, Dwarfism, Acromegaly and Catract
Question: 6
a)Name the structures labeled in the diagram of the ear.[5 marks]
b) Which structure that you have named:
i) converts sound waves into mechanical vibrations
ii) converts vibrations into nerve impulses.
iii) reponds to change in position.
iv)transmits impulses to the brain
v) equalizes atmospheric pressure in both side of the ear.
b) Give scientific reasons for the following scientific facts.[ 5 marks]
i) The tongue may be considered both a receptor organ and an effector organ.
ii) Throat infections can sometimes lead to ear infections
iii) Spinning round and round and suddenly stopping can lead to dizziness.
iv) Nocturnal animals tend to have many rods in the retina.
v) It is difficult to judge distances with one eye closed.
Question: 7
a) Given below is a diagram depicting a defect of the human eye. Study the
same and answer the questions that follow:[ 5 marks]
i)Name the defect shown in the diagram
ii) Give two possible reasons for this defect of the eye in human beings.
iii) Name the parts labeled 1 to 4.
iv) Name the type of lens used to correct this eye defect.
v) Draw a labeled diagram to show how the above mentioned defect is rectified
using the lens named above.
b) Write any four functions of WHO.
[2]
c) What are the different types of vaccines? Give one example for each.
[2]
d) What is stereoscopic vision?
[1].
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