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Q. No. A sound is perceived (realized) when:
1. The sound wave vibrates the ear drum
2. It is first created at its sources
3. The nerve impulse initiated by a sound wave from the inner ear reaches the brain
4. Vibrations within the inner ear activate a nerve impulse
Subtopic: Inner Ear: Cochlea (OLD NCERT) |
69%
From NCERT
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As a nerve impulse passes along an axon:
1. The membrane potential changes from positive to negative and then back again
2. Sodium ions flow out through ion channels and potassium ions flow in
3. Sodium channels open as the membrane potential becomes less negative
4. The sodium-potassium pump moves sodium ions into the cell
1. The membrane potential changes from positive to negative and then back again
2. Sodium ions flow out through ion channels and potassium ions flow in
3. Sodium channels open as the membrane potential becomes less negative
4. The sodium-potassium pump moves sodium ions into the cell
Subtopic: Origin of Resting Membrane Potential | Action Potential |
From NCERT
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Which one of the alternatives below defines the layers of the retina in correct sequence (if the first layer in each sequence is supposed to be located next to the vitreous humour)?
1. Pigmented cells → Bipolar cells → Ganglion cells → Photoreceptors
2. Photoreceptors → Pigmented cells → Ganglion cells → Bipolar cells
3. Ganglion cells → Bipolar cells → Photoreceptors → Pigmented cells
4. Photoreceptors →Bipolar cells → Ganglion cells → Pigmented cells
1. Pigmented cells → Bipolar cells → Ganglion cells → Photoreceptors
2. Photoreceptors → Pigmented cells → Ganglion cells → Bipolar cells
3. Ganglion cells → Bipolar cells → Photoreceptors → Pigmented cells
4. Photoreceptors →Bipolar cells → Ganglion cells → Pigmented cells
Subtopic: Human Eye (OLD NCERT) | Basic Anatomy of Human Eye (OLD NCERT) |
66%
From NCERT
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If you were to insert a tiny heating probe into the thermoregulatory centre of the hypothalamus and use it to raise the temperature of the hypothalamus slightly, what is most likely to occur?
1. Decreased circulation in the skin
2. Shivering
3. Decreased activity of the sweat gland
4. A drop in body temperature
1. Decreased circulation in the skin
2. Shivering
3. Decreased activity of the sweat gland
4. A drop in body temperature
Subtopic: Diencephalon |
55%
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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 |
52%
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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
Subtopic: Huma Eye: Accommodation (OLD NCERT) |
85%
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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%
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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 |
71%
From NCERT
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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.
Subtopic: Basic Anatomy of Human Eye (OLD NCERT) |
67%
From NCERT
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Assertion(A): The electrical potential difference across the resting plasma membrane is called as the resting potential.
Reason(R): The charge difference across the membrane makes the membrane polarised.
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): The charge difference across the membrane makes the membrane polarised.
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: Origin of Resting Membrane Potential | Action Potential |
58%
From NCERT
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