From inside to outside the correct order of the following cells in the retina would be:
1. Ganglion cells - Photoreceptor cells - Bipolar cells
2. Ganglion cells - Bipolar cells - Photoreceptor cells
3. Bipolar cells - Photoreceptor cells - Ganglion cells
4. Photoreceptor cells - Ganglion cells - Bipolar cells
Most sensory receptors function by producing depolarising potentials. Which of the following function by hyperpolarization rather than depolarization ?
1. proprioceptors
2. nociceptors
3. olfactory receptors
4. rods and cones
Photosensitive compound in the human eye is made up of:
| 1. Opsin and Retinal | 2. Opsin and Retinol |
| 3. Transducin and Retinene | 4. Guanosine and Retinol |
From outside to inside, the correct sequence of cells in the inner layer of human retina will be:
1. Photoreceptor cells, Bipolar cells, Ganglion cells
2. Ganglion cells, Bipolar cells, Photoreceptor cells
3. Photoreceptor cells, Ganglion cells, Bipolar cells
4. Ganglion cells, Photoreceptor cells, Bipolar cells
Which of the following statements is not correct?
| 1. | An action potential in an axon does not move backward because the segment behind is in a refractory phase. |
| 2. | Depolarization of hair cells of cochlea results in the opening of the mechanically gated Potassium- ion channels. |
| 3. | Rods are very sensitive and contribute to daylight vision. |
| 4. | In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction. |
Match the following columns and select the correct option :
Column - I Column - II
(a) Rods and (i) Absence of Cones photoreceptor cells
(b) Blind Spot (ii) Cones are densely packed
(c) Fovea (iii) Photoreceptor cells
(d) Iris (iv) Visible coloured portion of the eye
(1) (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
(2) (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
(3) (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
(4) (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
Read the following given statements and choose the correct option with respect to mechanism of vision.
Statement A: The light rays in visible wavelength focussed on the retina through the cornea and lens generate potentials in rods and cones. Statement B: The image formed on the retina is recognised based on the earlier memory and experience.
(1) Both statements are correct
(2) Both statements are incorrect
(3) Only statement A is correct
(4) Only statement B is correct
| 1. | A | Major refractory surface |
| 2. | B | Accommodation |
| 3. | C | Regulates diameter of pupil |
| 4. | D | Point of highest visual acuity |
| 1. | the choroid is avascular |
| 2. | lens is held in place by ligaments attached to the ciliary body |
| 3. | photopic vision and colour perception is a function of rods |
| 4. | aqueous humor has a gel-like consistency |
Match List - I with List - II regarding sensory organs in human.
| List - I | List - II |
| (a) Organ of corti | (i) Photo receptors |
| (b) Nasal mucosa | (ii) Gustatory receptors |
| (c) Taste buds | (iii) Auditory receptors |
| (d) Retina | (iv) Olfactory receptors |
Choose the correct answer from the option given below
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iv) | (iii) | (i) |
| 2. | (iii) | (iv) | (ii) | (i) |
| 3. | (iv) | (iii) | (i) | (ii) |
| 4. | (iii) | (i) | (ii) | (iv) |
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