Biology
With reference to the functioning of the eye, answer the questions that follow:
(a) What is the shape of the lens during (1) near vision (2) distant vision?
(b) Name the two structures in the eye responsible for bringing about the change in the shape of the lens.
(c) Name the cells of the retina and their respective pigments which get activated (1) in the dark and (2) in the light.
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Answer
(a) The shape of the lens during (1) near vision is more convex or rounded (2) distant vision is more flattened or thinner.
(b) Ciliary muscles and suspensory ligament
(c) In the dark:
Cells — rod cells
Pigment — rhodopsin
In the light:
Cells — cone cells
Pigment — iodopsin
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