Any factor that can bring a change in the body of an organism is called:

1. Response
2. Stimulus
3. Reflex
4. Impulse

Gyri and sulci are richly found in :

1. Renal cortex
2. Cerebral cortex
3. Spinal cortex
4. Adrenal cortex

Assertion. Effectors are the part of our body which, on receiving stimulus, set up waves of impulses towards the central nervous system.

Reason. The specialized epithelial cells of certain organs are capable of receiving stimuli which can be light, sound, heat, pain, hunger, etc.

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. The aggregates of the cell bodies or perikaryons of neurons form the synapse.

Reason. Ganglia are the structures from which the nerve fibres may arise or enter into, whereas the synapse connects two neurons with a small gap in between.

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