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NEET • BIOLOGY • NEURAL CONTROL AND COORDINATION

Neural control and coordination practice · Hard

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Showing 61-75 of 75 questions

61 Hard

61 of 75

Understanding +4 | -1

Read the following statements carefully and select the correct option
I. The medulla is connected to the spinal cord
II. Medulla contains controlling centres for respiration, cardiovascular reflexes and gastric secretion
III. Cerebellum has very convoluted surface in order to provide the additional space for more neurons

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Correct option: D

I, II and III

Option D (I, II and III) is correct because all three statements accurately describe the medulla and cerebellum functions and their connection to the spinal cord.

62 Hard

62 of 75

Understanding +4 | -1

Co-ordination is considered as an important process in an animal body because ;

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Correct option: D

All of the above

Option D (All of the above) is correct because coordination maintains homeostasis, enables organ interaction, and ensures normal organ function.

63 Hard

63 of 75

Understanding +4 | -1

The opening of ion-channels on post synaptic membrane generates -

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Correct option: D

Both (1) and (2)

Option D (Both (1) and (2)) is correct because the opening of ion channels can lead to either excitatory or inhibitory potentials.

64 Hard

64 of 75

Understanding +4 | -1

Neurons are excitable cells". The statement is best illustrated as

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Correct option: D

Their membrane exists in polarized state and responds to threshold stimulus

Option D (Their membrane exists in polarized state and responds to threshold stimulus) is correct because the ability of a neuron to respond to stimuli depends on its polarized membrane and the presence of a threshold stimulus.

65 Hard

65 of 75

Analyzing +4 | -1

Assertion: Change in potential from –70 mV to –0 80 mV is called Depolarisation

Reason: At –70 mV voltage gated Na+ channel open.

View answer and explanation

Correct option: D

If both Assertion and Reason are False

Option D is correct. Depolarization involves a change in potential towards a less negative value, and the voltage-gated Na+ channels typically open at a less negative potential than -70 mV.

66 Hard

66 of 75

Understanding +4 | -1

Assertion (A): Resting membrane potential is

-70\,mV

.

Reason (R):

Na^+

K^+

pump plays an important role in maintaining resting membrane potential.

View answer and explanation

Correct option: A

Both Assertion (A) and Reason (R) are the true, and Reason (R) is a correct explanation of Assertion (A)

Option A (Both Assertion (A) and Reason (R) are the true, and Reason (R) is a correct explanation of Assertion (A)) is correct because the sodium-potassium pump is crucial for maintaining the resting membrane potential of -70 mV.

67 Hard

67 of 75

Analyzing +4 | -1

Following are some nerves. Categorise them as afferent, efferent and mixed nerves according to their nature and than choose the correct option from the codes given below
I. Trigeminal nerves
II. Occulomotor nerves
III. Olfactory nerves
IV. Auditory cranial nerves
V. Hypoglossal cranial nerves
VI. Spinal accessory cranial nerves
VII. Optic nerves
VIII. Abducens nerves
IX. Pathetic nerves
X. Glossopharyngeal nerves
XI. Vagus cranial nerves
XII. Spinal nerves
XIII. Facial nerves
Codes
Afferent nerves Efferent nerves Mixed nerves

View answer and explanation

Correct option: A

III, VII, IV II, IX, VIII, VI, V I, XIII, X, XI, XII

Option A (III, VII, IV; II, IX, VIII, VI, V; I, XIII, X, XI, XII) is correct because it correctly categorizes the listed nerves as afferent, efferent, and mixed based on their function.

68 Hard

68 of 75

Understanding +4 | -1

When a neuron is not conducting any impulse i.e, resting, the axonal membrane comparatively ________ to potassium ions (

K^+

) and nearly ________ to sodium (

Na^+

) ions.

View answer and explanation

Correct option: B

More permeable, impermeable respectively

Option B (More permeable, impermeable respectively) is correct because the resting membrane is more permeable to potassium and nearly impermeable to sodium.

69 Hard

69 of 75

Understanding +4 | -1

During the first five minutes before an interview, a person experiences sweating, increased rate of heart beat and respiration. Which part of nervous system and hormones are responsible for the restlessness respectively?

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Correct option: C

Sympathetic nervous system; adrenaline and noradrenaline

Option C (Sympathetic nervous system; adrenaline and noradrenaline) is correct because the sympathetic nervous system and these hormones are responsible for the fight-or-flight response.

70 Hard

70 of 75

Understanding +4 | -1

Assertion (A): Pons varoli is a link between upper brain and spinal cord.
Reason (R): It helps in regulation of breathing movements.

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Correct option: B

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

Option B (Both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because while both statements are true, the pons being a link between the upper brain and spinal cord is not directly explained by its role in breathing regulation.

71 Hard

71 of 75

Understanding +4 | -1

Cornea transplant in humans is almost never rejected because

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Correct option: C

Cornea is an avascular part of the body

Option C is correct because the cornea lacks blood vessels, minimizing the risk of immune rejection after transplantation.

72 Hard

72 of 75

Remembering +4 | -1

Multipolar nerve cells are present in:

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Correct option: D

Brain

Option D (Brain) is correct because multipolar neurons, which have one axon and multiple dendrites, are predominantly found in the brain and spinal cord.

73 Hard

73 of 75

Understanding +4 | -1

Identify the correct statement w.r.t. organ of Corti in humans

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Correct option: D

It is located on the membrane which forms partition between scala media and scala tympani

Option D (It is located on the membrane which forms partition between scala media and scala tympani) is correct because the organ of Corti resides on the basilar membrane, which separates the scala media and scala tympani.

74 Hard

74 of 75

Remembering +4 | -1

Na – K pumps transports

View answer and explanation

Correct option: A

3N{a^ + }

out for

2{K^ + }

Option A (

3N{a^ + }

out for

2{K^ + }

in) is correct because the sodium-potassium pump transports 3 sodium ions out of the cell for every 2 potassium ions it transports into the cell.

75 Hard

75 of 75

Understanding +4 | -1

During rest, sodium pump of a nerve results in:

View answer and explanation

Correct option: A

{Na}^{+}

pumped out than

{K}^{+}

ions taken in

Option A (More

{Na}^{+}

pumped out than

{K}^{+}

ions taken in) is correct because the sodium-potassium pump actively transports 3 sodium ions out for every 2 potassium ions in.

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