Statement I: | The point where the optic nerve leaves the human eyeball is called as the blind spot. |
Statement II: | This area has only cones with highest visual acuity in human eye. |
1. | Both Statement I and Statement II are correct |
2. | Both Statement I and Statement II are incorrect |
3. | Statement I is correct but Statement II is incorrect |
4. | Statement I is incorrect but Statement II is correct |
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I. | Light induces dissociation of retinal from opsin. |
II. | There is a change in the permeability of the membrane of photoreceptors. |
III. | Potential differences are generated in the photoreceptor cells. |
IV. | Action potential is generated in the ganglion cells through the bipolar cells. |
V. | Optic nerve transmits impulse to visual cortex. |
VI. | Neural impulses are analysed and the image formed on the retina is recognised based on earlier memory or experience. |
1. | I → III → II → IV → V → VI → VII |
2. | I → II → IV → III → V → VI → VII |
3. | I → II → III → IV → V → VI → VII |
4. | I → II → III → IV → V → VII → VI |
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Identify the correct statements regarding the events A and B in the given diagram:
I: | A is depolarization and is caused by the influx of sodium ions. |
II: | B is repolarization and is caused by the efflux of potassium ions. |
A | B | C | D | |
1. | I | II | III | IV |
2. | II | V | I | III |
3. | I | III | II | IV |
4. | III | IV | II | I |
I: | The action potential, generated due to the depolarization of the axonal membrane, arrives at the axon terminal. |
II: | Potassium ions enter the synaptic knob. |
III: | Synaptic vesicles are activated and release neurotransmitter in the synaptic cleft. |
IV: | Neurotransmitter binds to the receptor on the post-synaptic membrane. |
A: | Frontal lobe | Planning, reasoning and problem solving |
B: | Parietal lobe | Integrating sensory information, including touch, temperature, pressure and pain |
C: | Occipital lobe | Location of the primary visual cortex which receives visual information from the eyes |
D: | Temporal lobe | Contains the primary auditory cortex, which receives auditory information from the ears |
1. | Only A and B | 2. | Only A, B and C |
3. | Only B, C and D | 4. | A, B, C and D |
What would be true regarding the structure shown in the given figure?
1. | It is a chemical synapse and there is unidirectional transmission of impulse across it. |
2. | It is a chemical synapse and a chemical neurotransmitter is involved in the transmission of impulse across it. |
3. | It is an electrical synapse and it is relatively slower than the chemical synapse. |
4. | It is an electrical synapse, and although faster than the chemical synapse, is rare in human body. |