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 continue to be positive |
| 4. | First positive, then negative, and again back to positive |
In the central nervous system, myelinated fibres form the............., while the non-myelinated fibre cells form the.................... .
1. Grey matter, white matter
2. White matter, grey matter
3. Ependymal cells, neurosecretory cells
4. Neurosecretory cells, ependymal cells
Which cranial nerve has the highest number of branches?
1. Facial nerve
2. Trigeminal
3. Vagus nerve
4. None of these
The junction between the axon of one neuron and the dendrite of the next is called:
1. junction point
2. a synapse
3. a joint
4. constant bridge
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 |
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