Free Neural Control And Coordination (Daily Quiz: 14) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Free Neural Control And Coordination (Daily Quiz: 14) Time:

Question-1

Clusters of neuron cell bodies embedded in the white matter of the brain are referred to as

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

Nuclei are areas of grey matter within the white matter, where nerve impulses are processed.


Question-2

The brain- stem includes the parts of

(a)

(b)

(c)

(d)


Question-3

In the chemistry of vision in mammals, the photosensitive substance is called

(a)

(b)

(c)

(d)

Explanation:

Answer: (a)

Photosensitive means sensitive to light. The rod cells of retina contain a purplish pigment called rhodopsin. They function in dim light and at night. Rhodopsin consists of a protein component, opsin, linked to a nonprotein chromophore, retinal (or retinene), a derivative of vitamin A. Light falling on the rod is absorbed by the retinal, which changes its form and separates from the opsin component. This initiates the transmission of a nerve impulse to the brain.


Question-4

Which of the following statement is correct for node of Ranvier of nerve?

(a)

(b)

(c)

(d)

Explanation:

Answer: (c)

At the level of node of Ranvier the myelin sheath is discontinuous but not the neurilemma lining. Actually myelin sheath is an integral part of Schwann cell – which form a continuous neurilemmal covering. Each Schwann cell wrap-around the neurite to form concentric layers of plasma membrane. But at the level of junction between two Schwann cells myelin cannot be formed and thus a gap appears.


Question-5

Which of the following is not involved in knee-jerk reflex?

(a)

(b)

(c)

(d)


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