Q. No.Consider the given two statements:
| Assertion (A): | Myelinated neurons transmit nerve impulses faster than unmyelinated neurons. |
| Reason (R): | Myelinated neurons form electrical synapse wile unmyelinated neurons form chemical synapse. |
| 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. | Both (A) and (R) are False. |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
66%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Neurons are excitable cells. |
| Reason (R): | Their membranes are in a polarised state. |
| 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 but (R) is True. |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
87%
From NCERT
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The resting axonal membrane is impermeable to:
I: Sodium ions
II: Potassium ions
III: Negatively charges proteins present in the axoplasm
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
83%
From NCERT
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Each time the sodium-potassium pump functions, it actively transports:
| 1. | 3 sodium ions outwards and 2 potassium ions into the cell. |
| 2. | 3 sodium ions into the cells and 2 potassium outwards. |
| 3. | 2 sodium ions outwards and 3 potassium ions into the cell. |
| 4. | 2 sodium ions into the cells and 3 potassium ions outwards. |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
85%
From NCERT
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In a resting axonal membrane:
| 1. | The outer surface possesses a positive charge while its inner surface becomes negatively charged. |
| 2. | The outer surface possesses a negative charge while its inner surface becomes positively charged. |
| 3. | Both the outer and the inner surface are positively charged. |
| 4. | Both the outer and the inner surface are negatively charged. |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
90%
From NCERT
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The electrical potential difference across the resting axonal membrane is called as the:
| 1. Resting potential | 2. Action potential |
| 3. Threshold potential | 4. Reversal potential |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
84%
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The re-establishment of the resting membrane potential after depolarization is primarily due to:
| 1. Sodium potassium pump | 2. Influx of sodium |
| 3. Efflux of potassium | 4. Efflux of sodium |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
61%
From NCERT
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Consider the given statements:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | When a stimulus is applied at a site on the polarised axonal membrane, the membrane at that site becomes freely permeable to sodium ions. |
| II: | A rapid influx of sodium at this point leads to reversal of polarity and the membrane at the site is said to be depolarised. |
| III: | The electric potential difference at the site is called the action potential which is in fact termed as nerve impulse. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Origin of Resting Membrane Potential | Action Potential |
85%
From NCERT
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Which of the following events is likely to happen if diffusion of ions is allowed in a resting polarized axonal membrane?
1. Na+ will move out of the cell
2. Na+ will move into the cell
3. K+ will move into the cell
4. Na+ and K+ will both move out of the cell
1. Na+ will move out of the cell
2. Na+ will move into the cell
3. K+ will move into the cell
4. Na+ and K+ will both move out of the cell
Subtopic: Action Potential |
62%
From NCERT
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Depolarisation of axonal membrane is due to influx of sodium ions. |
| Statement II: | Repolarisation of axonal membrane is due to efflux of sodium ions. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Origin of Resting Membrane Potential | Action Potential |
61%
From NCERT
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