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Q. No.Identify A, B, C and D in the table:
Impulse conduction in myelinated nerve fibre
Impulse conduction in unmyelinated nerve fibre
A
B
Action potential jumps from one node of Ranvier to another
Action potential travels along the entire length of fibre
Conduction is very fast and called saltatory conduction
Conduction is slow
C
D
Options
A
B
C
D
1.
Depolarisation occurs only at the nodes of Ranvier
Depolarisation occurs all along the length of nerve fibre
Energy expenditure is less
Energy expenditure is more
2.
Depolarisation occurs all along the length of nerve fibre
Depolarisation occurs only at the nodes of Ranvier
Energy expenditure is less
Energy expenditure is more
3.
Depolarisation occurs only at the nodes of Ranvier
Depolarisation occurs all along the length of nerve fibre
Energy expenditure is more
Energy expenditure is less
4.
Depolarisation occurs all along the length of nerve fibre
Depolarisation occurs all along the length of nerve fibre
Energy expenditure is less
Energy expenditure is more
Subtopic: Nervous System |
59%
Level 3: 35%-60%
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Read the following statements and choose the correct option:
A. Owls move freely during night.
B. They have large number of rods on their retina.
1. Both the statements A and B are correct and B is the correct explanation of A
2. Both the statements A and B are correct but B is not the correct explanation of A
3. Statement A is correct and B incorrect
4. Statement B is correct and A incorrect
A. Owls move freely during night.
B. They have large number of rods on their retina.
1. Both the statements A and B are correct and B is the correct explanation of A
2. Both the statements A and B are correct but B is not the correct explanation of A
3. Statement A is correct and B incorrect
4. Statement B is correct and A incorrect
83%
Level 1: 80%+
Hints
Which of the following is correct?
1. Adrenergic nerve fibres release neurotransmitters adrenalin and nor-adrenaline at their terminations
2. Cholinergic nerve fibres release neurotransmitter acetylcholine at their termination
3. Adrenergic fibres are generally preganglionic sympathertic fibres
4. More than one options are correct
1. Adrenergic nerve fibres release neurotransmitters adrenalin and nor-adrenaline at their terminations
2. Cholinergic nerve fibres release neurotransmitter acetylcholine at their termination
3. Adrenergic fibres are generally preganglionic sympathertic fibres
4. More than one options are correct
Subtopic: Nervous System |
72%
Level 2: 60%+
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Assertion (A): Inner part of the cerebral hemisphere is called white matter.
Reason (R): Myelin sheath containing fibres of the tracts make the inner part of the cerebral hemisphere.
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.
Reason (R): Myelin sheath containing fibres of the tracts make the inner part of the cerebral hemisphere.
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.
Subtopic: Nervous System |
74%
Level 2: 60%+
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Assertion (A): Photoreceptors are not present in the blind spot of the eye.
Reason (R): Blind spot is situated at a point medial to and slightly above the posterior pole of the eyeball.
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.
Reason (R): Blind spot is situated at a point medial to and slightly above the posterior pole of the eyeball.
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.
67%
Level 2: 60%+
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Assertion (A): When light strikes the retina, potential differences are generated in photoreceptors
Reason (R): Light induces dissociation of the retinal from opsin resulting in changes in the structure of the opsin which in turn causes membrane permeability changes.
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.
Reason (R): Light induces dissociation of the retinal from opsin resulting in changes in the structure of the opsin which in turn causes membrane permeability changes.
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.
75%
Level 2: 60%+
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The axoplasm inside the axon contains:
| 1. | low concentration of K+ |
| 2. | high concentration of negatively charged proteins |
| 3. | high concentration of Na+ |
| 4. | equal concentrations of Na+ and K+ |
Subtopic: Origin of Resting Membrane Potential | Action Potential |
88%
Level 1: 80%+
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How many of the given statements are correct?
| I: | The left and right cerebral hemispheres are connected by a tract of nerve fibres called corpus spongiosum. |
| II: | Association areas are neither clearly sensory nor motor in function. |
| III: | Thalamus is a major coordinating centre for sensory and motor signaling. |
| IV: | The hindbrain comprises pons, cerebellum and medulla. |
| V: | Three major regions make up the brain stem: mid brain, pons and medulla oblongata. |
| 1. | 2 | 2. | 3 |
| 3. | 4 | 4. | 5 |
Subtopic: Hind & Mid Brain | Diencephalon | Cerebrum, EEG & Sleep |
71%
Level 2: 60%+
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The somatic neural system relays impulses from:
| 1. | the CNS to skeletal muscles |
| 2. | the CNS to the involuntary organs and smooth muscles of the body |
| 3. | the skeletal muscles of the CNS |
| 4. | the involuntary organs and smooth muscles of the body to the CNS |
Subtopic: Nervous System |
79%
Level 2: 60%+
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Consider the two statements regarding the human internal ear:
| Statement I: | The malleus is attached to the tympanic membrane and the stapes is attached to the oval window of the cochlea. |
| Statement II: | At the base of the cochlea, the scala vestibuli ends at the round window, while the scala tympani terminates at the oval window which opens to the middle ear. |
| 1. | Statement I is incorrect; Statement II is correct |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
56%
Level 3: 35%-60%
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