[2 Mark Question Answer]

Question 12 Marks

Differentiate between the following pair of terms : Motor nerve and sensory nerve.

Answer

Motor nerve : It contains only motor neurons,
Example : Nerves going to the muscles of the eyeball.
Sensory nerve : It contains only sensoiy neurons.
Example : optic nerve of the eye

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Question 22 Marks

Differentiate between the following pair of terms : Receptor and effector.

Answer

Receptor : The nerve cell on receiving the stimulus sets up the waves of impulses towards the central nervous system.
Effector : ;Any muscle or gland on receiving the impulse from the brain $($or the spinal cord$)$, contracts or secretes.

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Question 32 Marks

Differentiate between the following pair of terms : Stimulus and impulse

Answer

Stimulus : Any change in the environment that usually results in change in the activity of the body.
Impulse : A wave of electrical disturbance that runs through the nerves.

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Question 42 Marks

Mention the three functions of spinal cord .

Answer

Spinal cord has the following functions.
$1.$ It is the centre of reflex actions below the neck.
$2.$ It carries messages from the skin and muscles to the brain.
$3.$ All the stimuli and responses are passed from and to the brain through the spinal cord.

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BIOLOGY [2 Mark Question Answer]

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