66 



EXAMINATION QUESTIONS. 



green and what are not? What gives 

 the greenness to the green parts ? What 

 is the great difference in function be- 

 tween the parts which sire not green 

 and those which are? (S.K.E.) 



138. What is the nature of and 

 composition of chlorophyll? Where 

 is it found, and how is it formed? 

 (S.K.E.) 



139. What constituents of sunlight 

 are most effective in producing the 

 chemical changes on which the nutri- 

 tion of plants depends? (S.K.E.) 



140. What is the nature of starch ? 

 How is it formed, and what is its use? 

 (S.K.E.) 



141. Why do plants require nitrogen, 

 and in what form do they take it in? 

 (S.K.E.) 



142. From what source and iu what 

 forms do plants usually absorb their 

 nitrogenous food? Mention cases in 

 which the nitrogenous food is absorbed 

 from other sources and in other forms. 

 (S.K.E.) 



143. Give a brief account of the genus 

 Drosera, and describe its insectivorous 

 mechanism. (S.K.A.) 



144. Give an account of the move- 

 ment of water in the plant, and state 

 the tissues, that take part in it. 

 (S.K.A.) 



145. Trace the course of the sap from 

 the root to the leaves. (S.K.E.) 



146. What is meant by respiration ? 

 Describe an experiment for showing 

 that plants respire. (S.K.E.) 



147. What are stomata ? Where are 

 they found in the plant, and what is 

 their use? (S.K.E.) 



148. What is the difference in the 

 physiological action of green and 

 coloured leaves ? (S.K.A.) 



149. Explain precisely how a tendril 

 acts. (S.K.E.) 



150. What is the cause which enables 

 a plant to climb round a support? 

 (S.K.E.) 



151. Describe an experiment by 

 which it can be shown that the upward 

 growth of a stem and the downward 

 growth of a root is in each case to be 

 attributed to the action of gravity. 

 (S.K.A.) 



152. Explain why it is that, when 

 a seed germinates, the stem grows 

 upwards and the root downwards? 

 (S.K.E.) 



153. Describe the processes which 

 lead to the conversion of an ovule 

 into a seed, and state which is the 

 difference between albuminous and 

 exalbuminous seeds, giving examples. 

 (S.K.E.) 



