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Q. No.| I: | In a neuron, Nissl’s granules are present in dendrites as well as cell body |
| II: | Unmyelinated neurons in peripheral neural system are not enclosed by a Schwann cell |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| I: | Myelinated nerve fibres |
| II: | Unmyelinated nerve fibres |
2. Only II
3. Both I and II
4. Neither I nor II
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | Diffusion of sodium to the inside of the cell. |
| 2. | Diffusion of sodium to the outside of the cell. |
| 3. | Diffusion of potassium to the outside of the cell. |
| 4. | Diffusion of potassium to the inside of the cell. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIdentify 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. Influx of sodium ions
2. Efflux of sodium ions
3. Influx of potassium ions
4. Efflux of potassium ions
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. three sodium ions from outside to inside a cell.
2. three sodium ions from inside to outside a cell.
3. two potassium ions from outside to inside a cell.
4. two sodium ions from outside to inside a cell.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following minerals reduces the excitability of nerves and muscles?
1. Potassium
2. Sodium
3. Magnesium
4. Manganese
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect Chapter Topics:
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