Assertion (A): Synapse is the junction between two neurons which communicates impulses/ messages.

Reason (R): Neurons must be connected with each other through some means in order to transmit the unidirectional flow of impulses.

1. Both A and R are true.
2. Both A and R are false.
3. A is true and R is false.
4. A is false and R is true.

Assertion (A): Cerebellum enables us to remember, think and reason.

Reason (R): It is the largest portion of the brain and occupies the whole central area.

1. Both A and R are true.
2. Both A and R are false.
3. A is true and R is false.
4. A is false and R is true.

Assertion (A): The sympathetic and parasympathetic nervous systems are antagonistic (opposite) in their actions.

Reason (R): Sympathetic nervous system becomes active when a person is in fear whereas parasympathetic nervous system gets activated when in anger.

1. Both A and R are true.
2. Both A and R are false.
3. A is true and R is false.
4. A is false and R is true.

Assertion (A): The arrangement of white and grey matter is reversed in spinal cord from that in the brain.

Reason (R): In brain, the outer portion is white and the inner portion is grey. In spinal cord, the outer portion consists of cytons of neurons whereas the inner portion contains the axons of neurons.

1. Both A and R are true.
2. Both A and R are false.
3. A is true and R is false.
4. A is false and R is true.