Biology
The figure given below shows the principal parts of a human ear. Study the diagram and answer the following questions.
(a) Label the parts 1 to 8.
(b) State the role of parts 6, 7 and 8.
(c) Why is it harmful to use a sharp object to remove ear wax? Mention the number and name of the part involved.
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Answer
(a) The labelled parts are:
- 1 → External ear (pinna)
- 2 → Ear drum (tympanum)
- 3 → Auditory canal
- 4 → Malleus
- 5 → Semicircular canals
- 6 → Cochlea
- 7 → Auditory nerve
- 8 → Eustachian tube
(b) Part 6 (Cochlea) — It contains sensory cells for hearing.
Part 7 (Auditory nerve) — It transmits impulse of hearing to the brain.
Part 8 (Eustachian tube) — It equalizes air pressure on both the sides of the tympanum.
(c) It is harmful to use a sharp object to remove ear wax as it can rupture the ear drum.
The part involved is part 2 — Ear drum (tympanum).
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Given below is a diagram of a part of the human ear. Study the same and answer the questions that follow:
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(iii) State the functions of the parts labelled 'A' and 'B'.
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(a) Draw a neat and well labelled diagram of the membranous labyrinth found in the inner ear.
(b) Based on the diagram drawn above in (a), give a suitable term for each of the following descriptions:
(i) The structure responsible for hearing.
(ii) The sensory cells that help in hearing.
(iii) The membrane-covered opening that connects the middle ear to inner ear.
(iv) The nerves that carry impulses from the ear to the brain.
(v) The tube which equalises the air pressure on either side of the ear drum.