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NEET • BIOLOGY • NEURAL CONTROL AND COORDINATION

Neural control and coordination practice · Easy

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Showing 31-60 of 96 questions

31 Easy

31 of 96

Remembering +4 | -1

The pressure on either sides of the ear drum gets equalized by

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Correct option: B

Eustachian tube

Option B (Eustachian tube) is correct because the Eustachian tube equalizes pressure on either side of the eardrum.

32 Easy

32 of 96

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Assertion: Impulse transmission across an electrical synapse is always faster than that across a chemical
synapse.
Reason: At electrical synapses, the membranes of pre- and post-synaptic neurons are in very close
proximity

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Correct option: A

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

Option A (If both the assertion and the reason are true and the reason is a correct explanation of the assertion) is correct because electrical synapses are faster due to direct ion flow through gap junctions, placing pre- and post-synaptic membranes in close proximity.

33 Easy

33 of 96

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A person is wearing spectacles with concave lenses for correcting vision. While not using the glasses, the image of a distant object in his case will be formed?

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Correct option: C

In front of retina

Option C (In front of retina) is correct because concave lenses are used to correct myopia (nearsightedness), meaning without the glasses, the image focuses in front of the retina.

34 Easy

34 of 96

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A neuron is a …… structure

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Correct option: A

Microscopic

Option A (Microscopic) is correct because neurons are cells and are generally too small to be seen without a microscope.

35 Easy

35 of 96

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Which of the following statement is correct for nodes of Ranvier of a nerve?

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Correct option: C

Myelin sheath is discontinuous

Option C (Myelin sheath is discontinuous) is correct because Nodes of Ranvier are gaps in the myelin sheath along the axon of a neuron.

36 Easy

36 of 96

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How many pairs of spinal nerve are found in human?

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Correct option: B

Option B is correct because humans have 31 pairs of spinal nerves that emerge from the spinal cord to innervate the body.

37 Easy

37 of 96

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Cranium is the protective covering of

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Correct option: C

Brains

Option C (Brains) is correct because the cranium, also known as the skull, is the bony structure that protects the brain.

38 Easy

38 of 96

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The electrical potential difference across the resting plasma membrane is called as

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Correct option: C

Resting potential

Option C (Resting potential) is correct because the electrical potential difference across the plasma membrane of a neuron at rest is called the resting potential.

39 Easy

39 of 96

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Which of the following pairs is correctly matched?

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Correct option: D

Multipolar neuron – in cerebral cortex

Option D (Multipolar neuron – in cerebral cortex) is correct because multipolar neurons are the most common type of neuron in the central nervous system, including the cerebral cortex.

40 Easy

40 of 96

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Which part of the brain is involved in the regulation of sexual behaviour?

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Correct option: C

Limbic system and hypothalamus

Option C (Limbic system and hypothalamus) is correct because both these brain regions are involved in regulating sexual behavior.

41 Easy

41 of 96

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Photoreceptor cells that contains the light sensitive proteins are called

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Correct option: B

Photopigments

Option B (Photopigments) is correct because photopigments are the light-sensitive pigments found in photoreceptor cells (rods and cones).

42 Easy

42 of 96

Understanding +4 | -1

The velocity of action potential propagation

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Correct option: B

Depends on the thickness of the myelin around the axon

Option B (Depends on the thickness of the myelin around the axon) is correct because the velocity of action potential propagation is directly related to the myelination and its thickness around the axon.

43 Easy

43 of 96

Remembering +4 | -1

The …… nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon

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Correct option: A

Myelinated

Option A (Myelinated) is correct because myelinated nerve fibers are characterized by the presence of Schwann cells forming a myelin sheath around the axon.

44 Easy

44 of 96

Understanding +4 | -1

If dorsal nerve of spinal cord is broken down then

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Correct option: A

No impulse is transmitted

Option A (No impulse is transmitted) is correct because the dorsal nerve of the spinal cord carries afferent (sensory) information, and if it's broken, sensory impulses cannot reach the CNS.

45 Easy

45 of 96

Analyzing +4 | -1

Which of the following structure or region incorrectly paired with its functions?

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Correct option: B

Limbic system - Consists of fibre tracts
that interconnect different
regions of brain

Option B (Limbic system - Consists of fibre tracts that interconnect different regions of brain) is correct because the limbic system is more than just fiber tracts; it's a complex set of structures involved in emotion, memory, and motivation.

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46 Easy

46 of 96

Understanding +4 | -1

Grey matter of the brain is
I. present outside the white matter
II. matter containing medullated nerve fibres
III. grey in colour
IV. matter containing cell bodies
Which of the statements mentioned above are correct?

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Correct option: C

I, III and IV

Option C (I, III and IV) is correct because grey matter is present outside the white matter, is grey in color, and contains cell bodies.

47 Easy

47 of 96

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Organ of Corti is found in

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Correct option: C

Inner ear

Option C (Inner ear) is correct because the Organ of Corti, the sensory organ for hearing, is located within the cochlea of the inner ear.

48 Easy

48 of 96

Understanding +4 | -1

Which of the following is not correct for rods?
I. Twilight vision is the function of the rods
II. It is responsible for daylight vision sometimes
III. The rods contain a protein called rhodopsin
IV. Rods are photoreceptor cells
Choose the correct option

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Correct option: B

Only II

Option B (Only II) is correct because rods are responsible for twilight vision and contain rhodopsin, but they are NOT responsible for daylight vision.

49 Easy

49 of 96

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The joint between axon of a neuron and the dendrite of the next is called

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Correct option: A

Synapse

Option A (Synapse) is correct because the junction between the axon of one neuron and the dendrite of the next is called a synapse, where neurotransmitters facilitate communication.

50 Easy

50 of 96

Understanding +4 | -1

Which of the following statements is correct for the nodes of Ranveir' in nerves?

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Correct option: B

Myelin sheath is discontinuous

Option B (Myelin sheath is discontinuous) is correct because at the nodes of Ranvier, the myelin sheath is absent, allowing for saltatory conduction.

51 Easy

51 of 96

Understanding +4 | -1

In knee jerk reflex action, the efferent pathway emerges from

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Correct option: C

Grey matter of spinal cord

The correct answer is C (Grey matter of spinal cord) because the efferent pathway, carrying motor signals, originates from the grey matter of the spinal cord.

52 Easy

52 of 96

Remembering +4 | -1

The number of cranial nerves in frog and man is

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Correct option: A

10 and 12

Option A (10 and 12) is correct because frogs have 10 cranial nerves, while humans have 12.

53 Easy

53 of 96

Remembering +4 | -1

In the blind spot, where the optic nerves leave the eyes

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Correct option: A

Rods and cones are absent

Option A (Rods and cones are absent) is correct because the blind spot is the area where the optic nerve exits the eye, and therefore lacks photoreceptor cells (rods and cones).

54 Easy

54 of 96

Understanding +4 | -1

Which is an example of conditioned reflex?

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Correct option: A

Your keeping took up a stone then dog run away

The correct answer is A (Your keeping took up a stone then dog run away) because it involves learning and association, which are characteristics of a conditioned reflex.

55 Easy

55 of 96

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Node of Ranvier is found in

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Correct option: D

Axon

Option D (Axon) is correct because Nodes of Ranvier are gaps in the myelin sheath along the axon of a neuron.

56 Easy

56 of 96

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Skeletal muscles are controlled by

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Correct option: C

Somatic nerves

Option C (Somatic nerves) is correct because skeletal muscles are under voluntary control, which is mediated by the somatic nervous system.

57 Easy

57 of 96

Understanding +4 | -1

Maintenance of the ionic gradients across the resting membrane is done by the

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Correct option: A

Active transport of ions

Option A (Active transport of ions) is correct because maintaining ionic gradients requires energy to move ions against their concentration gradients.

58 Easy

58 of 96

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The system that transmits impulse from the CNS to the involuntary organs and smooth muscles of the body

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Correct option: D

Autonomic neural system

Option D (Autonomic neural system) is correct because it transmits impulses from the CNS to involuntary organs and smooth muscles.

59 Easy

59 of 96

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Connection between axon and dendrite is

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Correct option: A

Synapse

Option A (Synapse) is correct because a synapse is the junction between an axon and a dendrite, allowing for nerve impulse transmission.

60 Easy

60 of 96

Analyzing +4 | -1

Which statements are wrong?
I.Synaptic cleft of neurons secrete adrenaline.
II.Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
III.Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form myelin sheath.
IV.Spinal cord and cranial nerves are made of non-myelinated nerve fibres.
Of the four statements,

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Correct option: D

II and III are correct but I and IV are incorrect

Option D (II and III are correct but I and IV are incorrect) is correct because statements II and III accurately describe myelinated and non-myelinated nerve fibers, while I and IV contain inaccuracies about adrenaline secretion and spinal/cranial nerve composition.

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