1. Only II is incorrect | 2. I and II are correct |
3. III and IV are incorrect | 4. All are correct |
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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. |
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1. | is comparatively more permeable to sodium ions and nearly impermeable to potassium ions. |
2. | is freely permeable to sodium ions and potassium ions. |
3. | is impermeable to sodium ions and potassium ions. |
4. | is comparatively more permeable to potassium ions and nearly impermeable to sodium ions. |
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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 |
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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. |
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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. |
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1. Resting potential | 2. Action potential |
3. Threshold potential | 4. Reversal potential |
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 |
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1. Cerebrum | 2. Thalamus |
3. Hypothalamus | 4. Cerebellum |
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I: | The cerebral cortex, referred to as the grey matter, is thrown into prominent folds. |
II: | The cerebral white mater contains motor areas, and association area. |
1. Both are correct | 2. Both are incorrect |
3. Only I is correct | 4. Only II is correct |
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