NATIONAL ACADEMY FOR LEARNING
BENGALURU
2024-2025
BIOLOGY
GRADE: 10 ICSE TYPE OF ASSESSMENT: WS
No of Pages: 3
1. Chapter - Structure of Chromosomes, Cell Cycle and Cell Division
Give reason:
(a) Gametes must be produced by meiosis for sexual reproduction.
(b) Meiosis referred to as ‘reductional division’?
(c) The children of the same parents, howsoever similar, are different from each other
in certain aspects
Chapter- Genetics- Some Basic Fundamentals
(a) Does the sex of the child depend on the father, or it is just a matter of chance?
Discuss
(b) Haemophilia and colour blindness is more common in males than female
Chapter- Absorption by Roots- The Processes Involved
1. Give reasons for the following:
(a) If you sprinkle some common salt on grass growing on a lawn, it is killed at that spot.
(b) If you uproot a plant from the soil, its leaves soon wilt.
(c) It is better to transplant seedlings in a flower-bed in the evening and not in the morning.
(d) A plant cell when kept in a hypertonic salt solution for about 30 minutes turns flaccid.
(e) Potato cubes when placed in water become firm and increase in size.
Chapter- Transpiration
1. Give reason/ suitable explanation for each:
(a) Nerium loses less amount of water during transpiration.
(b) More transpiration occurs from the under surface of a dicot leaf.
(c) Transpiration increases with the velocity of wind.
(d) Leaves of some plants wilt during midday and recover in the evening.
(e) Guttation normally occurs during early mornings or late nights.
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(f) Forests tend to bring more rains.
Chapter- Photosynthesis
1. Give reasons/explain:
(a) It is necessary to place a plant in the dark before starting an experiment on
photosynthesis.
(b) It is not possible to demonstrate respiration in a green plant kept in sunlight.
(c) Most leaves have the upper surface more green and shiny than the lower surface.
(d) During the starch leaf test the leaf is –
i. Boiled in water.
ii. Boiled in methylated spirit.
Chapter- Chemical Coordination in Plants
(a) Root grows towards the water source but shoot grows towards light.
(b) If you trim the apical part of a young plant it will have profuse branching and
have more flowers.
Chapter- The Nervous system
(a) The brain and the spinal cord are referred to as the central nervous system.
(b) Neurotransmitters are broken down by an enzyme just after passing an impulse from
one neuron to another.
(c) Sometimes medicines dropped into the eyes come into the nose and even throat.
(d) Three small bones of ear ossicles are advantageous as compared to one single bone
for hearing.
(e) Blind spot is considered as 'area of no vision'.
Chapter- The Circulatory System
1. Give reasons/explain:
(a) The left ventricle has thicker walls than the right ventricle.
(b) The walls of right ventricle are thicker than those of the right auricle.
(c) Vitamin K is essential for the process of blood clotting.
(d) A mature mammalian Erythrocyte lacks nucleus, mitochondria and endoplasmic
reticulum.
(e) People have a common belief that the heart is located on the left side of the chest.
Chapter- The Excretory System
Give reason:
(a) Excretion is a necessary process of our body.
(b) Why does the cortex of kidneys show a ‘dotted’ appearance?
(c) We urinate fewer times in summer than in winter and the urine passed is generally thicker.
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(d) Why does the medulla of kidneys show a ‘striped’ appearance?
Chapter- The Endocrine System
(a) Adrenaline is often described as the emergency hormone.
(b) Pituitary is popularly called as the master gland.
(c) People living in the low Himalayan hilly regions often suffer from goitre.
(d) Simple goitre can be prevented by using iodised salt in food.
2. (a) Draw a labelled diagram of a myelinated neuron.
(b) What are the advantages of having a nervous system?
(c) What is the difference between reflex action and voluntary action?
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