Biology
The figure given below refers to the vertical section of the eye of a mammal. Study the figure carefully and answer the following questions.
(a) Label the guidelines shown as 1 to 10.
(b) Write one important role of parts shown as 3 and 7.
(c) Write one structural difference between the parts shown as 9 and 10.
(d) Mention one functional difference between the parts shown as 6 and 8.
Sense Organs
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Answer
(a) The guidelines are labelled below:
- 1 → Aqueous chamber
- 2 → Lens
- 3 → Iris
- 4 → Cornea
- 5 → Conjunctiva
- 6 → Sclera
- 7 → Choroid
- 8 → Retina
- 9 → Yellow spot
- 10 → Optic nerve (Blind spot)
(b) Part 3 (Iris) — It contains radial muscles to dilate the pupil and circular muscles to constrict the pupil.
Part 7 (Choroid) — It is the middle layer of the eyeball, richly supplied with blood vessels and provides nourishment to the eye.
(c) Part 9 (yellow spot) contains sensory cells especially the cone cells while part 10 (blind sport) contains no sensory cells.
(d) Part 6 (sclera) gives shape to the eyeball and part 8 (retina) acts as screen to form image of an object.
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Related Questions
The figures (A) and (B) given below are showing some kind of adjustment. Study the figures and answer the questions that follow.
(a) Identify the kinds of adjustments done in the figure (A) and (B).
(b) Distinguish between the adjustments of figures (A) and (B) on the basis of :
(i) The size of pupil.
(ii) The pigment which gets regenerated.
(iii) Cells of the retina.
Given below is a diagram depicting a defect of the human eye? Study the same and answer the questions that follow:
(a) Name the defect shown in the diagram.
(b) Give two possible reasons for this defect.
(c) Name the parts labelled 1 to 4.
(d) Name the type of lens used to correct this eye defect.
(e) Draw a labelled diagram to show how the above mentioned defect is rectified using the lens named above.
(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.
With reference to human eye and ear answer the questions that follow :
(a) Name the parts of the eye associated with:
(i) Regulation of the size of pupil.
(ii) Regulation of the shape of lens.
(iii) Keeping the lens moist and protecting it from physical shock.
(iv) The layer providing nourishment to the eye.
(b) Name the part of the ear associated with :
(i) Static balance.
(ii) Dynamic balance.
(iii) Hearing.
(iv) Amplification of vibrations.