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Q. No.Consider the two statements:
Assertion (A):
Neurons are excitable cells.
Reason (R):
Their membranes are in a polarised state.
1. Both (A) and (R) are True but (R) does not correctly explain (A).
2. Both (A) and (R) are True and (R) correctly explains (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic: Neuroanatomy |
83%
From NCERT
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Different types of ion channels are present on the neural membrane. When a neuron is not conducting any 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
| I: | the axonal membrane is comparatively more permeable to potassium ions and nearly impermeable to sodium ions. |
| II: | the axonal membrane has an excess of negative charge on the outside and an excess of positive charge just on the inside of the membrane. |
| III: | the axonal membrane is impermeable to negatively charged proteins present in the axoplasm. |
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: Action Potential |
84%
From NCERT
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The ionic gradients across the resting axonal membrane are maintained by:
| 1. | the passive transport of sodium and potassium ions through membrane channels. |
| 2. | the passive transport of sodium and chloride ions through membrane channels. |
| 3. | the active transport of ions by the sodium-potassium pump which transports 3 Na+ outwards for 2 K+ into the cell. |
| 4. | the active transport of ions by the sodium-chloride pump which transports 3 Na+ outwards for 2 Cl- into the cell. |
Subtopic: Action Potential |
94%
From NCERT
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When a stimulus of adequate strength is applied at a site on the polarised membrane, the membrane at that site becomes:
1. freely permeable to Na+.
2. freely permeable to K+.
3. impermeable to Na+.
4. impermeable to K+.
1. freely permeable to Na+.
2. freely permeable to K+.
3. impermeable to Na+.
4. impermeable to K+.
Subtopic: Origin of Resting Membrane Potential | Action Potential |
88%
From NCERT
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Consider the two statements:
| Assertion (A): | Electrical synapses allow for faster transmission than chemical synapses. |
| Reason (R): | Electrical synapses are rare in our system. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | Both (A) and (R) are True and (R) correctly explains (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Action Potential |
85%
From NCERT
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The cranial meninge which is in contact with the brain tissue is called:
1. dura mater
2. arachanoid mater
3. pia mater
4. gray mater
1. dura mater
2. arachanoid mater
3. pia mater
4. gray mater
Subtopic: Nervous System | Fore Brain |
88%
From NCERT
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The human forebrain consists of all the following except:
| 1. | cerebrum | 2. | thalamus |
| 3. | hypothalamus | 4. | cerebellum |
Subtopic: Hind & Mid Brain | Fore Brain |
95%
From NCERT
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Consider the two statements:
1. Statement I is correct; Statement II is incorrect
2. Statement I is incorrect; Statement II is incorrect
3. Statement I is correct; Statement II is correct
4. Statement I is incorrect; Statement II is correct
| Statement I: | The cerebral hemispheres are connected by a tract of nerve fibres called corpus striatum. |
| Statement II: | The layer of cells which covers the cerebral hemisphere is called cerebral cortex. |
2. Statement I is incorrect; Statement II is incorrect
3. Statement I is correct; Statement II is correct
4. Statement I is incorrect; Statement II is correct
Subtopic: Fore Brain |
79%
From NCERT
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Consider the two statements:
| Assertion (A): | The cerebral cortex is referred to as the grey matter. |
| Reason (R): | Myelin sheaths around the axons give the cerebral cortex a grey appearance. |
| 1. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Fore Brain |
66%
From NCERT
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Association areas in the cerebral cortex:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | are neither clearly sensory nor motor in function. |
| II: | are for complex functions like inter-sensory associations, memory and communication. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Fore Brain |
86%
From NCERT
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