Q. No.In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed would drive
1. K+ into the cell
2. Na+ into the cell
3. Na+ out of the cell
4. K+ and Na+ out of the cell
1. K+ into the cell
2. Na+ into the cell
3. Na+ out of the cell
4. K+ and Na+ out of the cell
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Column I list the parts of the human brain and column II lists the functions. Match the two columns and identify the correct choice from those given :
|
Column I |
Column II |
||
|
A. |
Cerebrum |
p. |
Controls the pituitary |
|
B. |
Cerebellum |
q. |
Controls vision and hearing |
|
C. |
Hypothalamus |
r. |
Controls the rate of heartbeat |
|
D. |
Midbrain |
s. |
Seat of intelligence |
|
t. |
Maintains body posture |
| A | B | C | D | |
| 1. | t | r | q | p |
| 2. | r | t | q | p |
| 3. | t | s | p | q |
| 4. | t | s | p | q |
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An axon has 4 terminal ends connected with dendrites of four different neurons. Its nerve impulse will
1. Become weak due to distribution into four
2. Travel in all the four neurons with equal strength
3. Pass on to one neuron only
4. Travel to none because the movement of impulse is from dendrite to axon
| Assertion (A): | The resting membrane potential in a neuron is much closer to the equilibrium potential of K+ ions than it is to equilibrium potential of Na+ ions. |
| Reason (R): | While potassium is the principal cation in the intracellular fluid, sodium is the principal cation in the extracellular fluid. |
In the light of the above statements choose the correct answer from the options given below:
| 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. |
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| Assertion (A): | Once initiated, the action potential has a magnitude that is independent of the strength of the triggering stimulus. |
| Reason (R): | Action potentials are all or none responses to stimuli. |
In the light of the above statements choose the correct answer from the options given below:
| 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. |
Assertion: The smaller the size of an axon the higher will be its conduction velocity.
Reason: The smaller the size of an axon the lesser is the resistance to current flow.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Electrical synapses are faster but rare in human beings. |
| Reason (R): | Electrical synapses contain gap junctions that allow electric current to flow directly from one neuron to another. |
In the light of the above statements choose the correct answer from the options given below:
| 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. |
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Assertion: Sympathetic and parasympathetic divisions bring about opposite effects in organs innervated by them.
Reason: The preganglionic neurons of the two subdivisions release different neurotrnasmitters.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion: Nerve gas Sarin and agricultural insecticide Parathion can cause severe spastic paralysis in humans.
Reason: Sarin and Parathion act as inhibitors of the enzyme choline acetyl transferase.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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