Q. No.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.
I. The photo pigments 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 photo pigments.
1. (I) and (II)
2. (I), (III) and (IV)
3. (I) and (III)
4. (II), (III) and (IV)
Select the best option from the following statements:
I. Vitamin-A derivatives are formed from carotene.
I. The photo pigments 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 photo pigments.
1. (I) and (II)
2. (I), (III) and (IV)
3. (I) and (III)
4. (II), (III) and (IV)
Myelin sheath is produced by
1. Schwann cells and Oligodendrocytes
2. Astrocytes and Schwann cells
3. Oligodendrocytes and Osteoclasts
4. Osteoclasts and Astrocytes
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
Photosensitive compound in human eye is made up of
1. Opsin and Retinal
2. Opsin and Retinol
3. Transducin and Retinene
4. Guanosine and Retinol
Destruction of the anterior horn cells of the spinal cord would result in loss of
1. sensory impulses
2. voluntary motor impulses
3. commissural impulses
4. integrating impulses
In mammalian eye, the 'fovea' is the center of the visual field where
1. high density of cones occur, but has no rods
2. the optic nerve leaves the eye
3. only rods are present
4. more rods than cones are found
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Injury localised to the hypothalamus would most likely disrupt
1. short term memory
2. coordination during locomotion
3. executive function, such as decision making
4. regulation of body temperature
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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 photo pigment rhodopsin, while cones have three different photo pigments
3. Retinal is a derivative of vitamin-C
4. Rhodopsin is the purplish red protein present in rods only
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Which part of the human ear plays no role in hearing as such but is otherwise very much required?
1. Eustachian tube
2. Organ of Corti
3. Vestibular apparatus
4. Ear ossicles
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A person entering an empty room suddenly finds a snake, right in front, on opening the door. Which one of the following is likely to happen in his neurohormonal control system?
1. Sympathetic nervous system is activated, releasing epinephrine and norepinephrine from adrenal medulla
2. Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse
3. Hypothalamus activates the parasympathetic division of brain
4. Sympathetic nervous system is activated, releasing epinephrine and norepinephrine from adrenal cortex
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