: ICSE Class X Important Questions : Biology (1996)
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.
I (40 Marks)
Attempt all questions from this Section.
(a) Name the following: 
The respiratory pigment contained in human
The process by which raisins swell up when
placed in a beaker of water.
The blood vessel that supplies oxygenated blood
to the liver.
An organism which helps in nitrogen fixation.
The paper which is used to show loss of water
through stoma of a leaf .
The process by which leucocytes squeeze out
through walls of capillaries.
The cells of the retina that are sensitive to
The organ in which the foetus develops in a
(b) Complete the following
statements by choosing the correct alternative out of the given in brackets: 
The human kidney is made up of millions of
( Neurons/ Bowman's capsules/ Nephrons)
Fertilization of the human egg normally occurs
in the ............. (Uterus/ Fallopian tube/ Vagina)
Loss of water as droplets through leaves of an
intact plant is termed .............. (Bleeding/ Guttation/ Transpiration)
During the process of expiration in man the
(Flattened/ Convex towards abdominal cavity/ Convex towards thoracic cavity)
The wall of the heart is made up of
(Striated muscle/ Voluntary muscle/ Cardiac muscle)
Penicillin obtained from a fungus is an
(Antiseptic/ Antibody/ Antibiotic)
(c) State whether the following
statements are True or False. If false, rewrite the statement in its correct
form by changing the first or last word only. 
The energy currency of the cell is D.NA.
Zygote is the product of fusion of male and
Low humidity in the atmosphere results in a
decrease in the rate of transpiration.
Tubectomy involves the cutting and tying of the
vas deferens in male.
Hypermetropia is a defect of the eye caused due
to the eyeball being elongated.
W.H.O procures and provides blood to victims of
(d) The figure given below shows one
of the causes of air pollution: 
What is meant by air pollution?
The exhaust from these chimneys contain H2SO4
etc. as pollutants. Mention one harmful effect of each of the above
pollutants either to man or to the environment.
Mention. any two harmful effects of noise
(e) Give one point of difference
between the following on the basis of what is within brackets. 
Aerobic and Anaerobic respiration. (End
products of glucose molecule)
Red blood corpuscle and white blood corpuscle.
Cerebrum and spinal cord. (Arrangement of neurons)
(f) The diagram given alongside
represents the cross-section of the human eye: 
Name the parts labelled 1 to 12.
What is the function of the part marked '10'?
What would happen if part '5' is damaged or
Answer any four questions from this section.
(a) The apparatus arranged below signifies an important process. 
Name the process
Where does this process occur in plants?
What solution is placed inside the dialysis
What happens to the level of the solution in
the capillary tube?
Define the process mentioned in Q. 'i' above.
What is meant by 'reflex action'? Mention any
two examples of reflex action occurring in day-to-day life.
Mention two functions of W.H.O.
(a) A potted destarched plant was taken in order to prove that light is
necessary e for photo-synthesis: 
What is meant by destarched plant? How can it
Using the destarched plant describe step by
step how you would proceed to prove that in the absence of light the leaf
(b) Given diagram is the external
features of the heart. 
Name the parts '1' to '7'.
What happens if the coronary artery gets an
What type of blood does '5' carry?
Mention one structural difference between '5'
(a) Given below is an experiment set up to demonstrate a phenomenon in plants:
What is the aim of this experiment?
Why was the bell jar covered with black cloth?
What is the purpose of caustic soda?
Give an overall chemical equation of the
process mentioned in Q 'i' above.
Draw a labelled diagram of the human kidney as
seen in a longitudinal section.
Name the hormones produced by the following
glands. In each case state one function the hormone. 1. Thyroid 2. Pancreas
3. Adrenal medulla 
(a) The diagram shown alongside is an apparatus used to study a particularil
phenomenon in plants: 
Name the apparatus.
What is it used for?
What is the role played by the air-bubble in
Of what use is the reservoir?
What happens to the movement of the air-bubble
if the apparatus is kept:
a. in the dark
b. in sunlight 3. in front of a fan?
Give a reason in each case.
Draw a diagram of the human sperm and label the
Head, middle, piece, acrosome, mitochondria, tail.
Define the following terms:
b. Death rate; 3. Hormones.
(a) The diagram below represents parts of the human ear: 
Name the parts labelled '1' to '8'.
What is the function of the parts marked '2'
Why is it harmful to use a pin or any sharp
object to remove the wax from the ear?
(b) Describe briefly the fuctions of
any five of the following: 
Placenta in mammals;
Write brief statements explaining any five of the following: 
People living in hilly regions usually suffer
from simple goitre.
Why resources cannot keep pace with the rising
population? Give examples.
Most often only one embryo is formed at a time
although there are two ovaries in women.
Strips of potato placed in 50% sucrose solution
appear soft and shrivelled.
It is advisable to breathe through the nose and
not through the mouth.
Insulin is injected into the body of a highly
diabetic patient and not given orally.