Assertion (A): The cerebrum is the seat of intelligence, consciousness and will power. It controls all voluntary activities of the body.

Reason (R): Cerebrum is the largest portion of the brain which accomodates a large number of neurons. Hence, it controls all the internal and external activities of the body, whether voluntary or involuntary.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Sympathetic and parasympathetic systems are the two parts of autonomic nervous system which are independent in their functioning and are not related to each other at all.

Reason (R): Both of these nervous systems are opposite in their actions. Sympathetic nervous system accelerates the actions while parsympathetic system relaxes them.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Correct the following statements by changing the first and the last word only :

1. Cerebrum maintains the balance of the body.
2. The long process which extends from the cell body of a neuron is termed as a dendron.
3. Enzymes regulate chemical coordination of the body.
4. Motor neurons carry impulses from the sense organs to the central nervous system.
5. Spinal cord regulates the heart beat and breathing movements.

Write one word in the space provided to complete the second pair of the related words pertaining to nervous system:

Memory : cerebrum :: breathing : ……………

Balance : cerebellum :: reasoning : ……………