U.C.E BIOLOGY 2009 PAPER 1 QN 32

Figure 4. Shows part of a section of a human eye.

a) Name the parts labelled a and b.

a……………………………………………………………………………………………..

b……………………………………………………………………………………………..

b) What is the function of structure b in the eye?

c) If a person entered a room with bright light, state the changes that would occur in each of parts a and b of the eye.

(i) a………………………………………………………………………………….

(ii) b………………………………………………………………………………….

d) In the space below, draw the shape of the lens only, when the eye is focusing on a near and distant object respectively.

When focusing on a When focusing on a distant near object

object

e) Describe how the shape of the lens is brought when the eye is focusing on a near object.

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