Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 1997PP1QN13
An experiment was carried out to determine the rate of transpiration in three plants A, B and C. Plants, A and B belonged to different species while plants B and C belonged to the same species. Plant C had all its leaves removed. The three plants were of similar size and were exposed to the same environment conditions. The results are as shown below in the graphs below
​(a) Suggest possible environment conditions under which the experiment was carried out between 30 and 60 minutes
(b) Account for the results obtained for plant C (c) Suggest the habitat for plant A and B. Give reasons for your answer. Habitat for plant A Habitat for plant B
ANSWERS
​(a)strong air/ winds
High temperature Low humidity; accept dry conditions/ sunlight (b)Absence of leaves/ stomata absent Transpiration; / little transpiration (c)Arid/dry/ desert/ accept semi- desert Reason Low rate of water loss; accept more/ a lot of water loss Wet/Moist/aquatic Reason High rate of water/ high rate of transpiration /acc. A lot of water loss
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