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.
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).
Related Questions
(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.
Have a look at the posture of this girl who is reading a book and answer the questions which follow:
(a) Name the problem she is facing.
(b) What are the two conditions shown in sections A and B of the eye as applicable to her?
(c) What kind of reading glasses does she need ?
Given below is a diagram of a part of the human ear. Study the same and answer the questions that follow:
(i) Give the collective biological term for Malleus, Incus and Stapes.
(ii) Name the parts labelled A, B and C in the diagram.
(iii) State the functions of the parts labelled 'A' and 'B'.
(iv) Name the audio receptor region present in the part labelled 'A'.
Draw a labelled diagram of the inner ear. Name the part of the inner ear that is responsible for static balance in human beings.