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Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - NEET MCQ


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15 Questions MCQ Test Biology Class 11 - Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT)

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) for NEET 2024 is part of Biology Class 11 preparation. The Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) below.
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Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 1

A typical value of resting membrane potential is

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 1

The electrical potential difference across the resting plasma membrane is called as the resting potential. Its value is - 70 mV.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 2

Which of the following options illustrates the distribution of Na+ and K+ ions in a section of non-myelinated axon which is at resting potential?

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 2

When a neuron is at resting potential i.e., not conducting any impulse; the axonal membrane is comparatively more permeable to K+ ions and nearly impermeable to Na+ ions. Consequently, the axoplasm inside the axon contains high concentration of K+ ions. In contrast, the fluid outside the axon has a high concentration of Na+ ions and thus forms a concentration gradient.

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Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 3

Which one of the following does not act as a neurotransmitter?

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 3

The chemicals releasing from a presynaptic neuron and interacting with specific receptors on postsynaptic neuron are called neurotransmitters. Cortisone is not a neurotransmitter.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 4

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 4

At resting potential (polarized phase), the in side of the plasma membrane is negatively charged (-70 mV). As the stimulus reaches, it becomes positively charged (+45 mV, depolarized phase). As impulse passes away, it regains its original ionic distribution and again becomes negatively charged.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 5

During the propagation of a nerve impulse, the action potential results from the movement of

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 5

Action potential is a change in electrical potential that occurs across a plasma membrane during the passage of a nerve impulse. During this period, there is a localized and translent switch in electric potential across the membrane from -70 mV to +45 mV. It is due to the fact that the sodium channels open and the potassium channels remain closed. As a result, sodium channels permit the influx of Na+ by diffusion from extracellular fluid to intracellular fluid.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 6

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 6

A nerve impulse is transmitted from one neuron to another with the help of chemicals called neurotransmitters that are released by the axon endings formed by the membrane of a pre-synaptic neuron which may or may not be separated by synaptic cleft.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 7

Saltatory conduction of impulse occurs in

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 7

The fatty myelin sheath of myelinated nerve fibres prevents the flow of ions between external fluid and fluid present within the axon. At the node of Ranvier, the insulating myelin sheath is absent and thus the ionic flow occurs at these points only. Therefore, the action potential jumps from node to node, due to which the transmission of impulse is more rapid myelinated fibres. This is called the saltatory conduction of nerve impulse.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 8

Sodium-potassium pump transports

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 8

Each Na+ -K+ pump expels three Na+ ions for every two K+ ions imported.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 9

Nerve fibres transmit the nerve message by _____ means.

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 9

Due to a gap of 200Å in between two neurons, the electrical transmission of nerve impulse is not possible because the postsynaptic membrane cannot be depolarized without the aid of neurotransmitters (chemicals). Hence, in this way, the transmission of nerve impulse is an electrochemical incidence.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 10

Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secrete adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which from a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
(iv) Spinal and cranial nerves are made of non-melinated nerve fibres.

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 10

Synaptic vesicles of the synaptic knob secrete neurotransmitter (e.g., adrenaline). Spinal nerves and cranial nerves are myelinated nerves.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 11

The electrical potential difference between outside and inside of a nerve axon before excitation is known as

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 11

The electrical potential difference between outside and inside of a nerve fibre excitation (polarized nerve fibre) is known as resting potential whose value is -70mV.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 12

Read the given statements and select the correct ones.
(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.
(ii) Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath.
(iii) Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K+) than to sodium ions (Na+).
(iv) A synapse is formed by the membranes of a presynaptic neuron and a post synaptic neuron.

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 12

Autonomic neural system controls and coordinates such organs which are under involuntary control and unstriated muscles of the body. Unmyelinated nerve fibres have Schwann cells which do not form myelin sheath.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 13

In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 13

The concentration gradients across the resting membrane are maintained by the active transport of ions by the sodium-potassium pump which transports 3 Na+ outward for 2K+ into the cell.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 14

Which of the following statements is/are incorrect about the electrical synapse?
(i) At electrical synapses, the membranes of pre and post synaptic neurons are in very close proximity.
(ii) Electrical current can flow directly from one neuron into the other across the synapses
(iii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along single axon
(iv) Electrica synapses pass electrical signal between cells with the use of Ach.
(v) Electrical synapses are fast.
(vi) Electrical synapses are rare in our system.

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 14

At electrical synapse, the transfer of impulse occurs by purely electrical means without involving any neurotransmitter.

Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 15

Read the given paragraph.
In the resting state, the axonal membrane is (i) with more (ii) charged ions outside than inside. This unequal distribution of ions os due to (1) the selective permeability of the membrane, which forms an almost impenetrable barrier to (iii) and (2) the action of the (iv) which pumps (v) Na+ out of the neuron for every (vi) K+ brought in.
Select the option that correctly fills the blanks in the paragraph.

Detailed Solution for Test: Generation, Conduction & Transmission of Nerve Impulse (NCERT) - Question 15

In the resting state, the axonal membrane is polarised with more positively charged ions outside than inside, unequal distribution of ions is due to the selective permeability of the membrane, which forms impermeable barrier to sodium ion and the action of the sodium which pumps three sodium ions out of the neuron for every two potassium ions brought in.
Thus, the correct option is '(i) - polarised, (ii) - positively, (iii) - Na + , (iv) - sodium - potassium pump, (v) - three, (vi) - two.'

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