Q. No.In the human eye, the visual acuity is highest at:
1. Macula lutea
2. Optic disc
3. Fovea centralis
4. Optic chiasma
The purplish red pigment rhodopsin contained in the rods type of photoreceptor cells of
the human eyes is a derivative of
1. vitamin-C
2. vitamin-D
3. vitamin-A
4. vitamin-B
Which of the following lights is not responded by photo pigments which are present in human eye?
(1) Red
(2) Green
(3) Blue
(4) Yellow
Sensation of white light is produced when
(1) When rodes are stimulated more than cones
(2) When cones are equally stimulated
(3) When rodes are equally stimulated
(4) When cones are stimulated more than rodes
Which statement is not correct concerning rods and cones?
1. Rods are responsible for black and white vision.
2. Cones are responsible for color vision.
3. Most of the rods and cones are concentrated in the fovea.
4. Cones are responsible for high visual acuity or sharpness.
Good vision depends on adequate intake of carotene rich food.
Select the best option from the following statements:
| i. | Vitamin A derivatives are formed from carotene |
| ii. | The photopigments are embedded in the membrane discs of the inner segment |
| iii. | Retinal is a derivative of Vitamin A |
| iv. | Retinal is a light-absorbing part of all the visual photopigments |
1. (i),(iii) and (iv)
2. (i) and (iii)
3. (ii), (iii) and (iv)
4. (i) and (iv)
Choose the correct statement:
| 1. | Nociceptors respond to changes in pressure |
| 2. | Meissner's corpuscles are thermoreceptors |
| 3. | Photoreceptors in the human eye are depolarised during darkness and become hyperpolarised in response to the light stimulus |
| 4. | Receptors do not produce graded potentials |
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 |
Which one of the following statements is not correct?
| 1. | Retinal is the light-absorbing portion of visual photo pigments |
| 2. | In retina, the rods have the photopigments rhodopsin while cones have three different photopigments. |
| 3. | Retinal is a derivative of Vitamin C |
| 4. | Rhodopsin is the purplish protein present in rods only. |
1. vitamin-C
2. vitamin-D
3. vitamin-A
4. vitamin-B
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