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Test: Assertion & Reason :Neural Control and Coordination - NEET MCQ


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15 Questions MCQ Test - Test: Assertion & Reason :Neural Control and Coordination

Test: Assertion & Reason :Neural Control and Coordination for NEET 2024 is part of NEET preparation. The Test: Assertion & Reason :Neural Control and Coordination questions and answers have been prepared according to the NEET exam syllabus.The Test: Assertion & Reason :Neural Control and Coordination MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Assertion & Reason :Neural Control and Coordination below.
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Test: Assertion & Reason :Neural Control and Coordination - Question 1

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : The chemical stored in the synaptic vesicles are termed as neurotransmitters.
Reason : Synaptic vesicles release these chemicals in the synaptic cleft.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 1

The axon terminal of the neuron contains many membrane bound vesicles called synaptic vesicle, in its cytoplasm. Within these vesicles , chemical substances such as adrenaline and acetylcholine remain stored. These chemicals are called neurotransmitters because they help to transmit nerve impulses across the synapses. When a nerve impulse passes the axon terminal, its synaptic vesicles release their stored chemicals to the synaptic cleft. These diffuse through the cleft to reach the membrane of the next neuron, stimulating the latter. This causes the nerve impulse to be transmitted along the next neuron.

Topic in NCERT: Transmission of Impulses

Line in NCERT: "Chemicals called neurotransmitters are involved in the transmission of impulses at these synapses."

Test: Assertion & Reason :Neural Control and Coordination - Question 2

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : The imbalance in concentration of Na+, K+ and proteins generates resting potential.
Reason : To maintain the unequal distribution of Na+ & K+, the neurons use electrical energy

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 2

To maintain the unequal distribution of Na+ and K+ ion, the neurons use chemical energy in the form of ATP to actively transport Na+ ion out of cell and more K+ inside the cell.

Topic in NCERT: NEURAL CONTROL AND COORDINATION

Line in NCERT: "The electrical potential difference across the resting plasma membrane is called as the resting potential."

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Test: Assertion & Reason :Neural Control and Coordination - Question 3

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : Transmission of nerve impulse across a synapse is accomplished by neurotransmitters.
Reason : Transmission across a synapse usually requires neurotransmitters because there is a small space, i.e., synaptic cleft, that separates one neuron from another.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 3

Transmission of nerve impulse across synapses is accomplishe by neurotransmitter because synapses comprises of a synaptic cleft between the end of one nerve fibres and the beginning of the next

Topic in NCERT: Transmission of Impulses

Line in NCERT: "Chemicals involved in the transmission of impulses at chemical synapses are called neurotransmitters."

Test: Assertion & Reason :Neural Control and Coordination - Question 4

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : The axonal membrane of the neuron is more permeable to sodium ion (Na+) and nearly impermeable to potassium (K+).
Reason : In a resting state, neuron conducts impulses.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 4

The axonal membrane of neuron is more permeable to potassium ions (K+) and nearly impermeable to sodium ions (Na+). In a resting state, neuron does not conduct any impulse as the fluids outside the cell membrane carry a relatively high positive charge while the fluids inside the cell membrane carry a less positive, or relatively negative charge.

Topic in NCERT: Generation and Conduction of Nerve Impulse

Line in NCERT: "the axonal membrane is comparatively more permeable to potassium ions (K*) and nearly impermeable to sodium ions (Na+)."

Test: Assertion & Reason :Neural Control and Coordination - Question 5

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion: Electrical synapses are rare in our system.
Reason: Impulse transmission across an electrical synapse is slower than that across a chemical synapse.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 5

There are two types of synapses, namely, electrical synapses and chemical synapses. At electrical synapses, the membranes of pre- and post-synaptic neurons are in very close proximity. Electrical current can flow directly from one neuron into the other across these synapses. At a chemical synapse, the membranes of the pre- and post-synaptic neurons are separated by a fluid-filled space called synaptic cleft. Chemicals called neurotransmitters are involved in the transmission of impulses at these synapses. Impulse transmission across and electrical synapse is always faster than that across a chemical synapse. Electrical synapses are rare in our system

Topic in NCERT: Transmission of Impulses

Line in NCERT: "Electrical synapses are rare in our system."

Test: Assertion & Reason :Neural Control and Coordination - Question 6

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion: Multipolar neurons have two or more axons and one dendrite.
Reason: Multipolar neurons are found usually in the embryonic stage.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 6

Based on the number of axons and dendrites, the neurons are divided into three types, i.e, multipolar (with one axon and two or more dendrites; found in the cerebral cortex), bipolar (with one axon and one dendrite, found in the retina of eye) and unipolar (cell body with one axon only; found usually in the embryonic stage).

Test: Assertion & Reason :Neural Control and Coordination - Question 7

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion: Myelinated nerve fibres are present in spinal and cranial nerves.
Reason: Myelinated nerves conduct impulses more rapidly than unmyelinated nerves.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 7

Myelinated nerve fibres are present in spinal and cranial nerves. Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon, and is commonly found in autonomous and the somatic neural systems. The conduction of impulses is faster in myelinated nerve fibre (or medullated nerve fibre) because when an impulse travels along a medullated nerve fibre, it does not proceed uniformly along the length of the axis cylinder, but jumps from one node of Ranvier to the next. This is called the saltatory conduction of impulses.

Topic in NCERT: NEURON AS STRUCTURAL AND FUNCTIONAL UNIT OF NEURAL SYSTEM

Line in NCERT: "Myelinated nerve fibres are found in spinal and cranial nerves."

Test: Assertion & Reason :Neural Control and Coordination - Question 8

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion: The resting membrane of the neuron exhibit polarity of charges.
Reason: The outer surface of the axonal membrane possesses a negative charge while its inner surface becomes positively charged.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 8

impulse, i.e., resting, the axonal membrane is comparatively more permeable to potassium ions (K+) and nearly impermeable to sodium ions (Na+). Similarly, the membrane is impermeable to negatively charged proteins present in the axoplasm. Consequently, the axoplasm inside the axon contains high concentration of K+ and negatively charged proteins and low concentration of Na+. These ionic gradients across the resting membrane are maintained by the active transport of ions by the sodium-potassium pump which transports 3 Na+ outwards for 2 K+ into the cell. As a result, the outer surface of the axonal membrane possesses a positive charge while its inner surface becomes negatively charged and therefore, is polarised.

Topic in NCERT: Generation and Conduction of Nerve Impulse

Line in NCERT: "The outer surface of the axonal membrane possesses a positive charge while its inner surface becomes negatively charged and therefore is polarised."

Test: Assertion & Reason :Neural Control and Coordination - Question 9

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion: Nerve fibre can become excited through touch, smell, pressure and chemical changes and there is a change in polarity.
Reason: It is called action potential.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 9

Action potential occurs in response to stimulation of nerve fibre as a result of various stimuli like touch, smell, pressure and chemical changes

Topic in NCERT: Transmission of Impulses

Line in NCERT: "When a stimulus is applied at a site... the membrane at the site A becomes freely permeable to Na+. This leads to a rapid influx of Na+ followed by the reversal of the polarity at that site, i.e., the outer surface of the membrane becomes negatively charged and the inner side becomes positively charged. The polarity of the membrane at the site A is thus reversed and hence depolarised. The electrical potential difference across the plasma membrane at the site A is called the action potential, which is in fact termed as a nerve impulse."

Test: Assertion & Reason :Neural Control and Coordination - Question 10

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : The membrane of a neuron is polarised.
Reason : Ion channels on the neural membrane are selectively permeable to different ions.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 10

The plasma membrane of the neuron is polarised due to the high out flow of Na+ ions to outside and low intake of K+ ion. Na+ ions outflow by the ion channel of plasma membrane and K+ ions inflow by it. This creates a difference in the positive potential across the plasma membrane. The membrane is less positive inside which is normally termed as negative inside w.r.t. outside.

Topic in NCERT: Generation and Conduction of Nerve Impulse

Line in NCERT: "Neurons are excitable cells because their membranes are in a polarised state. Different types of ion channels are present on the neural membrane. These ion channels are selectively permeable to different ions."

Test: Assertion & Reason :Neural Control and Coordination - Question 11

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : The presynaptic neuron transmits an impulse (action potential) across the synaptic cleft to the postsynaptic neuron.
Reason : For the transmission of impulses at synapse, chemicals called neurotransmitters are responsible.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 11

Signals from the axon terminal of presynaptic neuron are transmitted to the dendrites of the postsynaptic neuron with the help of chemicals known as neurotransmitters.

Topic in NCERT: Transmission of Impulses

Line in NCERT: "Chemicals called neurotransmitters are involved in the transmission of impulses at these synapses."

Test: Assertion & Reason :Neural Control and Coordination - Question 12

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : Neurons are excitable cells.
Reason : The membrane of neurons in a depolarised state is responsible for excitability.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 12

Neurons are excitable cells. Excitability is the ability of nerve cells to generate an electrical impulse in response to stimulus. When a nerve fibre receives stimulus, the potential across the membrane is reversed at the point of excitation. It means, the inner side of plasma membrane of the cell becomes more positively charged with respect to the outer side of plasma membrane. This change in polarity is called action potential. This condition of reverse polarity is said to be depolarised.

Topic in NCERT: Generation and Conduction of Nerve Impulse

Line in NCERT: "Neurons are excitable cells because their membranes are in a polarised state."

Test: Assertion & Reason :Neural Control and Coordination - Question 13

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : The brain stem contains centres for controlling activities.
Reason : Brain stem is very sensitive.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 13

The brain stem consists of pons varoli, medulla oblongata, mid brain and diencephalon. It is the connection between brain and spinal cord. It contains centres for controlling many vital activities, e.g. respiratory centres, vasomotor centres, salivary centres etc. It also carries nerve tracts between the spinal cord and the higher brain structure.

Topic in NCERT: Hindbrain

Line in NCERT: "The medulla contains centres which control respiration, cardiovascular reflexes and gastric secretions."

Test: Assertion & Reason :Neural Control and Coordination - Question 14

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : Medulla oblongata causes reflex actions like vomiting, coughing and sneezing.
Reason : It has many nerve cells which control autonomic reflexes.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 14

Medulla oblongata consists of accumulation of nerve cells act as vital centres of many autonomic reflexes like vomiting, coughing and sneezing.

Topic in NCERT: Hindbrain

Line in NCERT: "The medulla contains centres which control respiration, cardiovascular reflexes, and gastric secretions."

Test: Assertion & Reason :Neural Control and Coordination - Question 15

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : A cerebellum is related with skillful voluntary movement and involuntary activity like body balance, equilibrium, etc.
Reason : It is a part of hind brain and is situated behind the pons.

Detailed Solution for Test: Assertion & Reason :Neural Control and Coordination - Question 15

Hind brain consists of cerebellum located dorsally to medulla oblongat and pons varoli. It contains centres for maintenance of posture and equilibrium of the body and for the muscle tone. All activities of the cerebellum are involuntary but may involve learning in their early stages.

Topic in NCERT: Hindbrain

Line in NCERT: "The hindbrain comprises pons, cerebellum and medulla."

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