Neural Control and Coordination

NEET Biology · 57 questions · Page 3 of 6 · Click an option or "Show Solution" to reveal answer

Q21

Photosensitive compound in human eye is made up of

A Guanosine and Retinol

B Opsin and Retinal

C Opsin and Retinol

D Transducin and Retinene

Correct Answer

Option B

Solution

(b) Retinal is a polyene chromophore, bound to proteins called opsins, and is the chemical basis of animal vision.

Q22

The transparent lens in the human eye is held in its place by

A ligaments attached to the ciliary body

B ligaments attached to the iris

C smooth muscles attached to the ciliary body

D smooth muscles attached to the iris

Correct Answer

Option A

Solution

(a) Suspensory ligament of lens - a series of fibers that connect the ciliary body of the eye with the lens, holding it in place.

Q23

Which of the following statements is not correct about rods and cones?

A In retina the rods have the photopigment rhodopsin while cones have three different photopigments.

B Rods are very sensitive and contribute to daylight vision.

C Retinal is the light absorbing portion of visual photo pigments.

D Rhodopsin is the purplish red protein present in rods only.

Correct Answer

Option B

Solution

(b) Rods and cones are two types of photoreceptor in human retina.

Cones are very sensitive to operate in day light.

Rods are very sensitive in dim light and do not mediate colour vision.

Q24

The most abundant intracellular cation is :

Ca^{++}

H^{+}

K^{+}

Na^{+}

Correct Answer

Option C

Solution

Q25

Injury localized to the hypothalamus would most likely disrupt:

A short - term memory.

B co-ordination during locomotion.

C executive functions, such as decision making.

D regulation of body temperature.

Correct Answer

Option D

Solution

(d) The hypothalamus is responsible for hormone production.

The hormones produced by this area govern body temperature, thirst, hunger, sleep, circadian rhythm, moods, sex drive, and the release of other hormones in the body.

Q26

Stimulation of a muscle fiber by a motor neuron occurs at:

A the neuromuscular junction

B the transverse tubules

C the myofibril

D the sacroplasmic reticulum

Correct Answer

Option A

Solution

(a) The neuromuscular junction connects the nervous system to the muscular system via synapses between efferent nerve fibres and muscle fibres.

Q27

Destruction of the anterior horn cell of the spinal cord would result in loss of :

A voluntary motor impulses

B commissural impulses

C integrating impulses

D sensory impulses

Correct Answer

Option A

Solution

(a) In poliomyelitis, anterior horn cells of spinal cord are destructed which causes loss of motor activities of limbs.

Q28

Which of the following regions of the brain is incorrectly paired with its function?

A Cerebellum - language comprehension

B Corpus callosum - communication between the left and right cerebral cortices

C Cerebrum-calculation and contemplation

D Medulla oblongata - homeostatic control

Correct Answer

Option A

Solution

(a) Cerebellum maintains the balance and body posture. It is not concerned with logical part.

Q29

Ivan Pavlov performed experiments on

A simple reflexes

B conditioned reflexes

C cardiac reflexes

D origin of life

Correct Answer

Option B

Solution

(b) Conditioned reflexes were first demonstrated by Russian Scientist Ivan Pavlov in dogs.

Q30

In vertebrates, simple reflex action is

A polysynaptic

B bisynaptic

C trisynaptic

D monosynaptic

Correct Answer

Option D

Solution

(d) A reflex action is a nerve mediated spontaneous, automatic and involuntary response to a stimulus.

When a reflex arc consists of only two neurons in an animal (one sensory neuron, and one motor neuron), is defined as monosynaptic.

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