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Science · 2025 · 4 marks
CBSE 2025 · Region 4 · Set 1 · Q38
In life there are certain changes in the environment called 'stimuli' to which we respond appropriately. Touching a flame suddenly is a dangerous…
In life there are certain changes in the environment called 'stimuli' to which we respond appropriately. Touching a flame suddenly is a dangerous situation for us. One way is to think consciously about the possibility of burning and then moving the hand. But our body has been designed in such a way that we save ourself from such situations immediately.
(i)
Name the action by which we protect ourself in the situation mentioned above and define it.
(ii)
Write the role of (a) motor and (b) relay neuron.
(iii)
(A)
What are the two types of nervous system in human body? Name the components of each of them.
OR
(B)
Which part of the human brain is responsible for :
(a)
thinking
(b)
picking up a pencil
(c)
controlling blood pressure
(d)
controlling hunger
Marking-scheme solution
(i)
Reflex action.
The sudden action in response to stimuli in the environment.
(ii)
(a) Motor neuron - carries message from spinal cord to the effector organ/muscle
(b) Relay neuron - Connects sensory neuron to motor neuron.
(iii)
Central Nervous system.
Components: Brain; spinal cord
Peripheral Nervous system.
Components: cranial nerves; spinal nerves.
OR
(iii)(B)
(a) Fore-brain/Cerebrum
(b) Cerebellum / Hind-brain
(c) Medulla/ Hind-brain
(d) Fore-brain
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.