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Q. No.Match Column I with Column II:
Codes:
| Column I | Column II | ||
| A | Sensory neurons | P | carry signals from the CNS to effectors (muscles or glands) |
| B | Motor neurons | Q | connect sensory and motor neurons |
| C | Interneurons | R | transmit signals from sensory receptors to the central nervous system |
| A | B | C | |
| 1. | P | Q | R |
| 2. | Q | P | R |
| 3. | R | P | Q |
| 4. | R | Q | P |
Subtopic: Â Nervous System |
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In the peripheral neural system, Schwann cells surround the axons of:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | Myelinated nerve fibres |
| II: | Unmyelinated nerve fibres |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Â Nervous System |
 54%
From NCERT
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Myelination of axons of the central nervous system is brought about by:
| 1. | microglia | 2. | asrocytes |
| 3. | oligodendrocytes | 4. | Schwann cells |
Subtopic: Â Nervous System |
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Identify the correct statement regarding the sections of the spinal cord shown in the given diagram:
| I: | A and D are part of the grey mater |
| II: | B is motor and C is sensory |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Â Nervous System |
 55%
From NCERT
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What restores the resting membrane potential of the axonal membrane at the site of excitation?
1. Influx of sodium ions
2. Efflux of sodium ions
3. Influx of potassium ions
4. Efflux of potassium ions
1. Influx of sodium ions
2. Efflux of sodium ions
3. Influx of potassium ions
4. Efflux of potassium ions
Subtopic: Â Origin of Resting Membrane Potential |Â Action Potential |
 54%
From NCERT
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If the resting membrane of an excitable cell is made permeable to all ions, which of the following is least likely to happen?
1. Efflux of potassium
2. Influx of sodium
3. Influx of chloride
4. Efflux of sodium
Subtopic: Â Origin of Resting Membrane Potential |
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Repolarisation after depolarisation of the polarised axonal membrane is primarily due to:
1. Influx of sodium ions
2. Influx of potassium ions
3. Efflux of sodium ions
4. Efflux of potassium ions
1. Influx of sodium ions
2. Influx of potassium ions
3. Efflux of sodium ions
4. Efflux of potassium ions
Subtopic: Â Action Potential |
 56%
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When neuron is resting, which of the following is false with respect to that
| 1. | It is not conducting any impulse |
| 2. | Axonal membrane is more permeable to potassium ions |
| 3. | Axonal membrane won't allow any flow of sodium ions across it |
| 4. | Membrane is impermeable to negatively charged proteins |
Subtopic: Â Origin of Resting Membrane Potential |Â Action Potential |
 57%
From NCERT
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Which of the following minerals reduces the excitability of nerves and muscles?
1. Potassium
2. Sodium
3. Magnesium
4. Manganese
Subtopic: Â Action Potential |
 55%
From NCERT
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| Assertion(A): | The resting axonal membrane is more permeable to potassium ions than sodium ions |
| Reason(R): | Potassium is the principal cation in the intracellular fluid. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False and (R) is True. |
Subtopic: Â Origin of Resting Membrane Potential |
From NCERT
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