Which of the following statements is not correct?

1.	An action potential in an axon does not move backward because the segment behind is in a refractory phase.
2.	Depolarization of hair cells of cochlea results in the opening of the mechanically gated Potassium- ion channels.
3.	Rods are very sensitive and contribute to daylight vision.
4.	In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction.

Which of the following receptors are specifically responsible for maintenance of balance of body and posture?

1. Basilar membrane and otoliths

2. Hair cells and organ of corti

3. Tectorial membrane and macula

4. Crista ampullaris and macula

From outside to inside, the correct sequence of cells in the inner layer of human retina will be:
1. Photoreceptor cells, Bipolar cells, Ganglion cells
2. Ganglion cells, Bipolar cells, Photoreceptor cells
3. Photoreceptor cells, Ganglion cells, Bipolar cells
4. Ganglion cells, Photoreceptor cells, Bipolar cells

Which part of the ear determines the pitch of the sound?
1. Reissner’s membrane.
2. Basilar membrane.
3. Tectorial membrane.
4. Hair cells.

Which of the following statements are true regarding
association areas of brain?

A. These are the largest areas of forebrain.

B. These are involved in the regulation of sexual
behaviour, expression of emotional reactions
and motivation.

C. These are responsible for complex functions like
intersensory association, memory and
communication.

D. It is a part of cerebral cortex.

1. A & B 

2. A, B & C

3. A, C & D 

4. A & C

The iris __________.
1. regulates light entrance through the pupil
2. refracts light rays
3. absorbs stray light rays
4. contains receptors for sight

Cerebral aqueduct passes through the:
1. Mid brain
2. Diencephalon
3. Hind brain
4. Spinal cord

Area of the brain, most involved in maintaining the body's homeostasis, is:
1. medulla oblongata
2. cerebellum
3. pons
4. hypothalamus

An action potential for a given axon is:
1. different in size each time it occurs
2. always the same size
3. larger when the information is to be carried faster
4. smaller when information goes to a gland rather than a muscle

Assertion: Ear is a stato Acoustic organ.

Reason: Ear is related to hearing & balance.