Which structure in the ear converts pressure waves to action potentials?

(a)

Tympanic membrane

(b)

Organ of Corti

(c)

Oval window

(d)

Semicircular canal

Which of the following pairings is correct?

(a)

Sensory nerve - afferent

(b)

Motor nerve - afferent

(c)

Sensory nerve - ventral

(d)

Motor nerve - dorsal

During synaptic transmission of nerve impulse, neurotransmitter (P) is released from synaptic vesicles by the action of ions (Q). Choose the correct P and Q.

(a)

P = Acetylcholine, Q = Ca⁺⁺

(b)

P = Acetylcholine, Q =Na⁺

(c)

P = GABA, Q = Na⁺

(d)

P = Cholinesterase, Q = Ca⁺⁺

Examine the diagram of the two cell types A and B given below and select the correct option.

(a)

Cell-A is the rod cell found evenly all over retina

(b)

Cell-A is the cone cell more concentrated in the fovea centralis

(c)

Cell-B is concerned with colour vision in bright light

(d)

Cell-A is sensitive to bright light intensities

Assertion(A): The imbalance in concentration of Na⁺, K⁺ and proteins generates action potential.
Reason(R): To maintain the unequal distribution of Na⁺ and K⁺, the neurons use electrical energy.

(a)

Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.

(b)

Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.

(c)

Assertion is true, but Reason is false.

(d)

Both Assertion and Reason are false