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Q. No.Assertion (A): A real and inverted image is obtained on the retina.
Reason (R): Lens of eye is naturally biconcave
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.
Subtopic: Huma Eye: Accommodation (OLD NCERT) |
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Assertion (A): Tympanic membrane separates the external ear from the middle ear.
Reason (R): Tympanic membrane is composed of connective tissues.
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): Tympanic membrane is composed of connective tissues.
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.
Subtopic: Outer & Middle Ear (OLD NCERT) |
76%
From NCERT
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Assertion (A): The conditioned reflex is not present by birth
Reason (R): These action require learning
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): These action require learning
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.
Subtopic: Motor Functions of Spinal Cord |
73%
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If the vagus nerves were cut, which of the following would be true?
1. The diaphragm would be paralysed
2. Adrenalin secretion by adrenal gland would cease
3. Hearing will be impaired
4. None of the above
1. The diaphragm would be paralysed
2. Adrenalin secretion by adrenal gland would cease
3. Hearing will be impaired
4. None of the above
Subtopic: Nervous System |
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Which statement about the vertebrate nervous system is false?
1. In a simple reflex, the sequence followed by information is sensory receptor sensory neuron, interneuron, mator neuron, muscle cells
2. After completely severing the brain from the spinal cord, reflex withdrawl of the foot from a painful stimulus could still occur
3. Relaxation of muscle is caused by nerve impulses in inhibitory neurons going to the muscle from spinal cord
4. The symphathetic nervous system activates the body responses to stress, e.g., by increasing heart beat and dereasing blood flow to the gut
1. In a simple reflex, the sequence followed by information is sensory receptor sensory neuron, interneuron, mator neuron, muscle cells
2. After completely severing the brain from the spinal cord, reflex withdrawl of the foot from a painful stimulus could still occur
3. Relaxation of muscle is caused by nerve impulses in inhibitory neurons going to the muscle from spinal cord
4. The symphathetic nervous system activates the body responses to stress, e.g., by increasing heart beat and dereasing blood flow to the gut
Subtopic: Nervous System | Motor Functions of Spinal Cord |
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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
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 |
59%
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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 |
56%
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