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Q. No.Subtopic: Action Potential |
79%
From NCERT
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Subtopic: Human Eye (OLD NCERT) |
75%
From NCERT
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Autonomic nervous system affects
1. reflex actions
2. sensory organs
3. internal organ
4. all of the above
1. reflex actions
2. sensory organs
3. internal organ
4. all of the above
Subtopic: Autonomic Nervous System (OLD NCERT) |
65%
From NCERT
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Nerve impulse
Choose the correct answer from the options given below:
1. A and E only
2. B, C and D only
3. C, D and E only
4. B and D only
| A. | during the propagation of a nerve impulse, the action potential results from the movement of K ions from extracellular fluid to intracellular fluid |
| B. | electrical synapses are very rare in the human system |
| C. | receptor sites for neurotransmitters are present on the presynaptic membrane |
| D. | when the impulse reaches the presynaptic region, synaptic vesicles break and release neurotransmitters |
| E. | impulse through nerve fibers is unidirectional because nerve fibers are insulated by a medullary sheath |
1. A and E only
2. B, C and D only
3. C, D and E only
4. B and D only
Subtopic: Origin of Resting Membrane Potential | Action Potential | Synapse |
78%
From NCERT
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An action potential in the nerve fibre is produced when positive and negative charges on the outside and the inside of the axon membrane are reversed, because
| 1. | More potassium enters the axon as compared to sodium ions leaving it |
| 2. | More sodium enters the axon as compared to potassium ions leaving it |
| 3. | All potassium ions leave the axon |
| 4. | All sodium ions enter the axon |
Subtopic: Action Potential |
79%
From NCERT
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The potential difference across the membrane of a relaxed muscle fibre is called resting potential. It amounts to about
1. -90 mV
2. 50 mV
3. 100 mV
4. 50-100 mV
1. -90 mV
2. 50 mV
3. 100 mV
4. 50-100 mV
Subtopic: Origin of Resting Membrane Potential |
68%
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Select the incorrect statement
1. Autonomous nervous system is a part of CNS
2. Somatic nervous system is a part of PNS
3. Somatic nervous system relays impulses from CNS to skeletal muscles
4. Sensory impulses enter spinal cord through dorsal root ganglia
1. Autonomous nervous system is a part of CNS
2. Somatic nervous system is a part of PNS
3. Somatic nervous system relays impulses from CNS to skeletal muscles
4. Sensory impulses enter spinal cord through dorsal root ganglia
Subtopic: Nervous System |
77%
From NCERT
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From outside to inside, the sequence of three bones present in the middle ear of mammals is
1. malleus, stapes and incus
2. stapes, malleus and incus
3. malleus, incus and stapes
4. incus, malleus and stapes
1. malleus, stapes and incus
2. stapes, malleus and incus
3. malleus, incus and stapes
4. incus, malleus and stapes
Subtopic: Outer & Middle Ear (OLD NCERT) |
72%
From NCERT
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In parasympathetic nervous system, which of the following is released?
1. Epinephrine
2. Norepinephrine
3. Serotonin
4. Acetylcholine
1. Epinephrine
2. Norepinephrine
3. Serotonin
4. Acetylcholine
Subtopic: Autonomic Nervous System (OLD NCERT) |
52%
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'Adaption' of eyes in dark is due to?
1. depletion of vision pigments in rods
2. depletion of vision pigment in cones
3. repletion of vision pigment in rods
4. repletion of vision pigment in cones
1. depletion of vision pigments in rods
2. depletion of vision pigment in cones
3. repletion of vision pigment in rods
4. repletion of vision pigment in cones
Subtopic: Human Eye (OLD NCERT) |
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