Q. No.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
1. vitamin-C
2. vitamin-D
3. vitamin-A
4. vitamin-B
| 1. | equally permeable to both Na+ and K+ ions |
| 2. | impermeable to both Na+ and K+ ions |
| 3. | comparatively more permeable to K+ ions and nearly impermeable to Na+ ions |
| 4. | comparatively more permeable to Na+ ions and nearly impermeable to K+ ions |
The nerve centres which control the body temperature and the urge for eating are contained in:
1. hypothalamus
2. pons
3. cerebellum
4. thalamus
Which part of the human brain is concerned with the regulation of body temperature?
1. Medulla oblongata
2. Cerebellum
3. Cerebrum
4. Hypothalamus
Given below is a diagrammatic cross-section of a single loop of human cochlea.
Which one of the following options correctly represents the names of three different parts?
| 1. | B: Tectorial membrane C: Perilymph D: Secretory cells |
| 2. | C: Endolymph D: Sensory hair cells A: Serum |
| 3. | D: Sensory hair cells A: Endolymph B: Tectorial membrane |
| 4. | A: Perilymph B: Tectorial membrane C: Endolymph |
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
1. K+ ions from extracellular fluid to intracellular fluid
2. Na+ ions from intracellular fluid to extracellular fluid
3. K+ ions from intracellular fluid to extracellular fluid
4. Na+ ions from extracellular fluid to intracellular fluid
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 part of the brain is responsible for thermoregulation?
1. Medulla oblongata
2. Cerebrum
3. Hypothalamus
4. Corpus callosum
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