WORK OF THE SHOOT 



83 



is able, under the influence of sunlight, to absorb carbon 

 dioxide and give off oxygen, and further, that the light 

 rays absorbed are converted into forms of energy capable 



Fig. 52. Experiment to show that a Leaf of Pelargonium 

 exposed to Light in Air devoid of Carbon Dioxide does not 

 form Starch. 



of bringing about chemical changes resulting in the forma- 

 tion of starch. But starch is found only in those parts 

 of leaves which contain the green pigment chlorophyll, 

 and the experiment just performed proves to us another 



F 2 



