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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| 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 |
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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. Both 2 and 3
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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| 1. | microglia | 2. | asrocytes |
| 3. | oligodendrocytes | 4. | Schwann cells |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect Chapter Topics:
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