True.

False.
Correct statement: Afferent neurons carry impulses from the sense organ to the central nervous system.

True.

False.
Correct statement : Neuroglia do not initiate or conduct nerve impulses

True

False.
Correct Statement : Cerebellum co - ordinates voluntary activities.

The brain is suspended in a special fluid environment called cerebrospinal fluid.
Functions:
(i) It acts as shock absorbing fluid and protects the brain from damage when it is subjected to sudden jerk.
(ii) The CSF supplies nutrients to the brain.
(iii) It collects and removes wastes from the brain.
(iv) It is also responsible for maintaining a constant pressure inside the cranium.

i) It is the largest portion forming nearly two-third of the brain.
ii) The cerebrum is longitudinally divided into two halves as right and left cerebral hemispheres by a deep cleft called median cleft.
iii) Two cerebral hemispheres are interconnected by thick band of nerve fibres called corpus callosum.
iv) The outer portion of each cerebral hemisphere is formed of grey matter and is called cerebral cortex.
v) The inner or deeper part is formed of white matter and is called cerebral medulla.
vi) The cortex is extremely folded forming elevations called gyri with depressions between them termed as sulci that increase its surface area.
vii) Each cerebral hemisphere is divisible into a frontal lobe, a parietal lobe, a temporal lobe and an occipital lobe.
viii) These lobes are also known as cerebral lobes and are associated with specific functions.
ix) Any damage in specific lobe in turn affects its function.

Sudden quick action in response to something occurring in environment is known as reflex action.
(i) Reflex action is a rapid, automatic response to a stimulus, which is not under the voluntary control of the brain, i.e. it is an involuntary action.
(ii) It is a simple form of behaviour in which the same stimulus produces the same response every time, e.g.
(i) if we unknowingly touch a hot plate, we immediately move our hand away from it.
(ii) moving our foot away on stepping something sharp.

(a) If both A and R are true and R is correct explanation of A

(b) If both A and R are true but R is not the correct explanation of A