Q. No.Each time the sodium-potassium pump functions, it actively transports:
1.
3 sodium ions outwards and 2 potassium ions into the cell.
2.
3 sodium ions into the cells and 2 potassium outwards.
3.
2 sodium ions outwards and 3 potassium ions into the cell.
4.
2 sodium ions into the cells and 3 potassium ions outwards.
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| 1. | The outer surface possesses a positive charge while its inner surface becomes negatively charged. |
| 2. | The outer surface possesses a negative charge while its inner surface becomes positively charged. |
| 3. | Both the outer and the inner surface are positively charged. |
| 4. | Both the outer and the inner surface are negatively charged. |
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| 1. Resting potential | 2. Action potential |
| 3. Threshold potential | 4. Reversal potential |
I. When a stimulus is applied at a site on the polarised axonal membrane, the membrane at that site becomes freely permeable to sodium ions.
II. A rapid influx of sodium at this point leads to reversal of polarity and the membrane at the site is said to be depolarised.
III. The electric potential difference at the site is called the action potential which is in fact termed as nerve impulse.
| 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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| I: | The cerebral cortex, referred to as the grey matter, is thrown into prominent folds. |
| II: | The cerebral white mater contains motor areas, and association area. |
| 1. Both are correct | 2. Both are incorrect |
| 3. Only I is correct | 4. Only II is correct |
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| I: | The association areas of the cerebral cortex are neither clearly sensory nor motor in function. |
| II: | The association areas are responsible for complex functions like intersensory associations, memory and communication. |
| 1. Both are correct | 2. Both are incorrect |
| 3. Only I is correct | 4. Only II is correct |
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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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