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 |
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. |