| Statement I: | In a neuron, Nissl’s granules are not present in dendrites. |
| Statement II: | Unmyelinated nerve fibre is not enclosed by a Schwann cell in the peripheral neural system. |
| Statement III: | Myelinated neurons conduct impulse at a higher velocity when compared to unmyelinated neurons. |
| 1. | Only Statement I and Statement II are correct |
| 2. | Only Statement III is correct |
| 3. | Statement II and Statement III are incorrect |
| 4. | Statement I, Statement II and Statement III are correct |
| Assertion (A): | The neural system of Hydra is better organised than insects. |
| Reason (R): | Insects have a brain along with a number of ganglia and neural 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, (R) is False. |
| 4. | (A) is False, (R) is True. |
| 1. | Comparatively more permeable to K+ ions |
| 2. | Permeable to negatively charged proteins present in the axoplasm |
| 3. | Nearly impermeable to Na+ ions |
| 4. | Negatively charged on its inner surface |
| 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 |