U.C.E BIOLOGY 2002 PAPER 1 QN 28

Figure 3 shows the effect of unidirectional light on the growth of plant shoots. Study the figure and answer and answer the questions that follow.

(i) Intact coleoptiles,

(ii) Coleoptiles with cut tip.

(iii) Coleoptiles with tip covered with aluminum foil.

a) Explain why each coleoptile appears as shown after 5 days.

i) ………………………………………………………………………………….

ii) ………………………………………………………………………………….

iii) ………………………………………………………………………………….

b) What is the importance of the response shown in the diagram, to plants?

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