Q. No.Consider the given statements regarding the middle layer of the wall of human eyeball:
I: Choroid contains many blood vessels and looks bluish in colour.
II. It becomes thick in the anterior part to form the ciliary body.
III. The ciliary body itself continues forward to form the iris which is the visible cloured portion of the eye.
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
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| Statement I: | Photopic vision and colour vision is the function of rods in the human eye. |
| Statement II: | Scotopic [twilight] vision is the function of cones in the 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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| 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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1. canal of Schlemm, and is filled with aqueous humor.
2. anterior chamber, and is filled with vitreous humor.
3. aqueous chamber, and is filled with aqueous humor.
4. vitreous chamber, and is filled with vitreous humor.
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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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1. Malleus
2. Incus
3. Stapes
4. All of them
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Statement I: Scala media is filled with endolymph.
Statement II: Scala vestibuli ends at round window and scala tynpani ends at oval window.
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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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.
| 1. Only I | 2. Only II |
| 3. Both I and II | 4. Neither I nor II |
 |
Given figure shows the types of neurons found in human body. Identify the correct match for their location in the body from the options given: |
| I. Embryonic stages | II. Retina |
| III. Dorsal root ganglion of spinal nerve | |
| IV. Cerebral cortex | V. Olfactory membrane |
| 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. |
| 1. Only I, II and III | 2. Only I, III and IV |
| 3. Only II, III and IV | 4. I, II, III and IV |
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