Balance of body is controlled by

1. Spinal cord
2. Cerebellum
3. Cerebrum
4. Medulla

The smell of good food causes watering of your mouth. It is

1. Natural reflex
2. Acquired reflex
3. Inborn reflex
4. Ordinary reflex

Peripheral nervous system consists of different types of nerves which connect the central nervous system to all parts of the body. Cranial nerves, spinal nerves, sympathetic and parasympathetic nerves are all connected to different parts of the body. Which of the following does not belong to cranial nerves ?

1. Olfactory nerves
2. Auditory nerves
3. Optic nerves
4. Sympathetic nerves

Ayush, a student of class 8 was preparing for his biology annual exam but could not understand the terms Receptor, Effector, Stimulus and Response. Which of the following statements explains 'receptor' ?

P. Receptors are sense organs.

Q. Receptors send impulses to CNS through sensory nerves.

R. Receptors receive messages from the central nervous system.

1. Only R
2. Only Q
3. Only P and R
4. Only P and Q