Q. No.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
1. vitamin-C
2. vitamin-D
3. vitamin-A
4. vitamin-B
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Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
1. nerve fibre is insulated by a medullary sheath
2. sodium pump starts operating only at the cyton and then continues into the nerve fibre
3. neurotransmitters are released by dendrites and not by axon endings
4. neurotransmitters are released by the axon endings and not by dendrites.
Hearing impairment affects which part of the brain?
| 1. | Frontal lobe | 2. | Parietal lobe |
| 3. | Temporal lobe | 4. | Cerebellum |
Column I list the parts of the human brain and column II lists the functions. Match the two columns and identify the correct choice from those given :
|
Column I |
Column II |
||
|
A. |
Cerebrum |
p. |
Controls the pituitary |
|
B. |
Cerebellum |
q. |
Controls vision and hearing |
|
C. |
Hypothalamus |
r. |
Controls the rate of heartbeat |
|
D. |
Midbrain |
s. |
Seat of intelligence |
|
t. |
Maintains body posture |
| A | B | C | D | |
| 1. | t | r | q | p |
| 2. | r | t | q | p |
| 3. | t | s | p | q |
| 4. | t | s | p | q |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Electrical synapses are faster but rare in human beings. |
| Reason (R): | Electrical synapses contain gap junctions that allow electric current to flow directly from one neuron to another. |
In the light of the above statements choose the correct answer from the options given below:
| 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 but (R) is false. |
| 4. | Both (A) and (R) are false. |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Most of the synapses in vertebrates conduct information in only one direction. |
| Reason (R): | Only the postsynaptic cells can bind and respond to neurotransmitters. |
In the light of the above statements choose the correct answer from the options given below:
| 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 but (R) is false. |
| 4. | Both (A) and (R) are false. |
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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
In the internal ear, the membranous labyrinth is filled with:
1. cerebrospinal fluid
2. plasma
3. endolymph
4. perilymph
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Very fast correction during the ongoing rapid muscular activity initiated elsewhere is done by:
| 1. | Primary motor cortex | 2. | Wernicke’s area |
| 3. | Basal ganglia | 4. | Cerebellum |
A duct within the mesencephalon, contains cerebrospinal fluid (CSF), and connects the third ventricle to the fourth ventricle is called:
| 1. | interventricular foramen | 2. | cerebral aqueduct |
| 3. | foramen of Monro | 4. | foramen of Magendie |
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