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

The swollen base of semicircular canals containing projecting ridge is called–

1. Macula

2. Jacobson’s organ

3. Crista ampullaris

4. Organs of Corti

Go through the above sectional view of Cochlea. Identify A to E

Mark the incorrectly matched pair regarding the structure with its location and functions:-

How many of these contain sensory hair cells?
Eustechian tube, utricle, saccule, Semicircular
canals, scale media, scala vestibuli

1. 1
2. 3
3. 4
4. 2

The ___________ integrates information received from the semicircular canals of the ear and the auditory system.
1. Cerebrum.
2. Cerebellum.
3. Medulla oblongata.
4. Thalamus.

Which of the following is not a part of the autonomic neural system?
1. Brain
2. Spinal cord
3. Ganglion
4. Skeletal Muscle

For the given diagram which labeling and function is
correctly matched/described?

1. (a) $\to$ Fovea $\to$ Rods are densely packed.
2. (b) $\to$ Blindspot $\to$ No image formed.
3. (c) $\to$ Choroid $\to$ Coloured part of the eye which regulates diameter of pupil.
4. (d) $\to$ Ciliary body $\to$ No role in accommodation

The transduction of sound waves to action potentials takes place:

1. Within the tectorial membrane as it is stimulated by the hair cells.

2. When hair cells are bent against the tectorial membrane causing them to depolarize and release neurotransmitter molecule that stimulates sensory neurons.

3. As the basilar membrane becomes more permeable to sodium ions and depolarizes, initiating an action potential in sensory neurons.

4. Within the middle ear as the vibration is amplified by the malleus, incus, and stapes.