Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that 

1. nerve fibre is insulated by a medullary sheath 

2. sodium pump starts operating only at the cyton and then continues into the nerve fibre

3. neurotransmitters are relesed by dendrites and not by axon endings 

4. neurotransmitters are released by the axon endings and not by dendrites. 

Given below is a table comparing the effects of sympathetic and parasympathetic nervous system for four feature (a-d). Which one feature is correctly described?

The black pigment in the eye which reduces the internal reflection is located in

(a) retina

(c) cornea

(b) iris

(d) sclerotic.

Hearing impairment affects which part of brain?

(1) Frontal lobe

(2) Parietal lobe 

(3) Temporal lobe

(4) Cerebellum

One common example of simplex reflex is 
(1) tying your shoe laces while talking to another person and not looking at them 

(2) watering of mouth at the sight of a favourite food 

(3) climbing up a stairs in dark without stumbling

(4) closing of eyes when strong light is flashed across them.

Injury to vagus nerve in humans is not likely to affect
(1) tongue movements

(2) gastrointestinal movements

(3) pancreatic secretion

(4) cardiac movements.

Which of the following nerves arises from organ of Corti?
(1) Olfactory nerve

(2) Cochlear nerve

(3) Abducens nerve

(4) None of these

If medulla oblongata is destroyed then which of the following functions wil be effected ?
(1) No thermoregulation

(2) No vision

(3) No memory

(4) No response when pricked with needle

Na⁺/K⁺ pump is associated with

1. passive transport

2. active transport

3. osmosis

4. imbibition.

Which of the following is correctly labelled?
(1) A: Reissner's membrane

(2) B:Scala vestibuli

(3) C: Basilar membrane

(4) D: Tectorial membrane