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 are not green 
and those which are? (S8.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 in what 
forms do plants usually absorb their 
nitrogenous food? Meution cases in 
which the nitrogenous food is absorbed 
from other sources and in other forms. 
(S.K. E.) 
143. Givea 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.) 
179 
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? Whereare 
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.) 
