Q. No.Alzheimer’s disease in humans is associated with the deficiency of
1. dopamine
2. glutamic acid
3. acetylcholine
4. Gamma Amino Butyric Acid (GABA)
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 stimulus
4. Receptors do not produce graded potentials
A person is wearing spectacles with concave lenses for correcting vision. While not using the glasses, the image of a distant object in his case will be formed:
1. on the blind spot
2. behind the retina
3. in front of the retina
4. on the yellow spot
In a man, abducens nerve is injured. Which one of the following functions will be affected?
1. Swallowing
2. Movement of the eyeball
3. Movement of the neck
4. Movement of the tongue
Which of the following statements is correct?
1. Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye
2. Cornea is an external, transparent and protective proteinacious covering of the eye-ball
3. Cornea consists of dense connective tissue of elastin and can repair itself
4. Cornea is convex, transparent layer which is highly vascularised
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 one of the following is the correct difference between rod cells and cone cells of our retina?
|
Rod cells |
Cone cells |
||
|
1. |
Distribution |
More concentrated in centre of retina |
Evenly distributed all over retina |
|
2. |
Visual activity |
High |
Low |
|
3. |
Visual pigment contained |
Lodopsin |
Rhodopsin |
|
4. |
Overall function |
Vision in poor light |
Color vision and detailed vision in bright light |
A gymnast is able to balance his body upside down even in total darkness because of
1. Cochlea
2. Vestibular apparatus
3. Tectorial membrane
4. Organ of corti
Match the following columns and select the correct option
| Column I | Column II | ||
| (a) | The organ of Corti | (i) | Connects the middle ear and pharynx |
| (b) | Cochlea | (ii) | Coiled part of the labyrinth |
| (c) | Eustachian tube | (iii) | Attached to the oval window |
| (d) | Stapes | (iv) | Located on the basilar membrane |
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (i) | (iv) | (ii) |
| 2. | (iv) | (ii) | (i) | (iii) |
| 3. | (i) | (ii) | (iv) | (iii) |
| 4. | (ii) | (iii) | (i) | (iv) |
Match the following columns and select the correct option :
| Column I | Column II | ||
| (a) | Rods and cones | (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 |
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (i) | (ii) | (iv) |
| 2. | (ii) | (iii) | (i) | (iv) |
| 3. | (iii) | (iv) | (ii) | (i) |
| 4. | (ii) | (iv) | (iii) | (i) |
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