U.C.E BIOLOGY 2003 PAPER 1 QN 31

a) What is ‘transpiration’?

b) Figures 1 (a) and (b) show how temperature and humidity affect the rate of transpiration.

(i) From fig. 1(a), describe how the rate of transpiration changes with temperature.

(ii) From fig. 1(b), describe how the rate of transpiration changes with humidity.

c) Explain why:

(i) Temperature affects the rate of transpiration as shown in figure 1(a)

(ii) Humidity affects the rate of transpiration as shown in figure 1(b).

d) State the importance of transpiration in plants.

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