Parasites 9 1 



(c) Perfect parasites. — Of this group the Broom-rape and 

 Dodder are types. These plants possess no chlorophyll, hence 

 they cannot decompose the atmospheric carbon dioxide, so 

 they obtain from the plants on which they live sap which is 

 already elaborated. 



In the case of the Broom-rape the leaves are modified into 

 scales destitute of chlorophyll, whilst in the Dodder leaves are 

 entirely absent. 



