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Biology [2 Mark Question Answer]

Nervous System · ICSE STD 10 (ICSE - English Medium). 8 questions.

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[2 Mark Question Answer]

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8 questions · timed · auto-graded

Question 12 Marks
Why does one feel blinded for a short while on coming out of a dark room?
Answer
One feels blinded for a short while on coming out of a dark room.This is called light adaptation of the eye.It is due to the constriction of the pupil to prevent the entry of light into the eye and pigment rhodopsin is bleached to reduce the sensitivity of the rods.
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Question 22 Marks
Give two examples of reflex actions in our daily life.
Answer
Following are the two examples of reflex actions in our daily life :
(i) Removing hand suddenly when pricked by a thorn.
(ii) Blinking of eyelids on exposure to light.
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Question 32 Marks
Name the respective organs in which the following are located and mention the main function of each:
(i) Iris
(ii) Semicircular canals
Answer
(i) Iris: It is located in the eye. Its function is to protect the eyeball and controls the size of the pupil.
(ii) Semicircular canals: It is located in the inner ear. These are concerned with the body equilibrium.
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Question 42 Marks
Describe briefly the functions of medulla oblongata.
Answer
Functions of medulla oblongata -
(i) It controls the involuntary activities like - respiration, circulation, digestion, etc.
(ii) It controls the dilation and constriction of blood vessels.
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Question 52 Marks
Distinguish between the following pair of words:
Grey matter and white matter
Answer
Grey matterwhite matter
(i) It is composed of cell bodies of a nerve cell .(i) It is composed of axons from the nerve cells .
(ii) It lies outside the brain but inside the spinal cord .(ii) It lies inside the brain but outside the spinal cord .
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Question 62 Marks
Distinguish between the following pair of words:
Motor and sensory nerve
Answer
Motor nerve sensory nerve
A motor nerve contains motor fibres which bring impulses from the brain or spinal cord to the effector ornans. A sensory nerve contains sensory fibres which bring impulses from the sense organs to the brain or spinal cord.
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Question 72 Marks
Distinguish between the following pair of words:
Cranial nerve and spinal nerve
Answer
Cranial nervespinal nerve
(i) They arise from brain.(i) They arise from spinal cord .
(ii) There are 12 pairs of cranial nerves .(ii) There are 31 pairs of spinal nerves .
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Question 82 Marks
Distinguish between the following pair of words:
Nervous system and hormonal system
Answer
Nervous systemHormonal system
(i)  It co-ordinates the body through electrical impulses.(i) It secretes hormones.
(ii) The nervous system controls muscle movement, senses, heartbeat, breathing, digestion, memory and speech (ii) The endocrine system controls levels of glucose in the blood, hydration levels, heat productivity, sexual maturity, sperm and egg production and growth of cells and tissues.
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