Q. No.A canal called the cerebral aqueduct passes through the:
1. Diencephalon
2. Midbrain
3. III ventricle
4. IV ventricle
The parasympathetic division of the autonomic nervous system is characterized by each of these except which one?
1. Preganglionic fibers arise from the thoracic and lumbar regions of the spinal cord.
2. Terminal ganglia are located close to effector organs.
3. It controls the digestive activities.
4. Parasympathetic postganglionic fibers secrete acetylcholine.
Which one of the following is the correct difference between rod cells and cone cells of our retina?
| Features | Rod cells | Cone cells | |
| (a) | Visual acuity | High | Low |
| (b) | Visual pigment contained | Iodopsin | Rhodopsin |
| (c) | Overall function | Vision in poor light | Colour vision and detailed vision in bright light |
| (d) | Distribution | More concentrated in centre of retina | Evenly distributed all over retina |
1. a
2. b
3. c
4. d
During the transmission of nerve impulses through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?
| 1. | First negative, then positive, and again back to negative |
| 2. | First positive, then negative, and continue to be negative |
| 3. | First negative, then positive, and then continues to be positive |
| 4. | First positive, then negative, and again back to positive |
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 proteinaceous ring of the eyeball |
| 3. | Cornea consists of dense connective tissue of elastin and can repair itself |
| 4. | The Cornea is convex, transparent layer which is highly vascularised |
Assertion: Neural signals through the parasympathetic nerves can increase the cardiac output.
Reason: Parasympathetic neurons stimulation can increase the activities of SA node and strength
of ventricular contraction.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion: Ear is a stato Acoustic organ.
Reason: Ear is related to hearing & balance.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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 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 the brain |
| 4. | Sympathetic nervous system is activated releasing epinephrine and norepinephrine from the adrenal cortex |
The human hindbrain comprises three parts, one of which is:
| 1. | Cerebellum | 2. | Hypothalamus |
| 3. | Spinal | 4. | Corpus callosum |
An action potential for a given axon is:
1. different in size each time it occurs
2. always the same size
3. larger when the information is to be carried faster
4. smaller when information goes to a gland rather than a muscle
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