Given below are sets of four terms each. Choose the odd one and write the category of the remaining terms :

(a) Duramater, Gray matter, Piamater, Arachnoid

(b) Cerebrum, Cerebellum, Spinal cord, Medulla oblongata.

(c) Pons, Cyton, Axon, Dendrons

(d) Hypothalamus, Cerebellum, Pons, Medulla oblongata

(e) Sneezing, Blinking, Blushing, Knitting without looking

Given below is a median (sagittal) section of the human brain. Read the information and fill in the blanks:

Brain is an important organ of the nervous system, located in the head of the human body. It is protected by a hard, bony covering known as cranium. Most of the voluntary and involuntary actions of our body are regulated by the brain. Hence, it is considered as the 'control centre of the body.

Brain is a part of the (a) …………… system. It's membranous protective covering is termed as (b) …………… which consists of three layers. The thin delicate middle layer of the membranous covering is (c) …………… . The largest portion of the brain is (d) …………… . Brain contains the smallest endocrine gland named, (e) …………… which is considered as the 'Master gland' of the human body.

State whether the following statements are true (T) or false (F).

(a) The main component of the white matter of the brain is perikaryon.

(b) The arachnoid layer fits closely inside the pia mater.

(c) A double chain of ganglia, one on each side of the nerve cord belongs to the spinal cord.

(d) Dura mater is the outermost layer of the meninges.

State whether the following are simple reflexes, conditioned reflexes or neither of the two.

(i) Sneezing……………………

(ii) Blushing……………………

(iii) Contraction of eye pupil………………..

(iv) Lifting up a book……………………

(v) Knitting without looking…………………

(vi) Sudden application of brakes of the cycle on sighting an obstacle in front……………….