Plant Defences 1 1 7 



■ curtains " of cells filled with red sap which further protects 



Fig. 104. - ^-L/iacainfserus papvracea^ 

 small green fleshy leaves. 



h^. M. Papery itipules cover the 



the chlorophyll from the 

 chemical rays of the sun. 



This chapter has dealt 

 with the way some plants 

 have become adapted to cer- 

 tain regions in South Africa 

 so that they have survived 

 in the "struggle for exist- 

 ence ". Plants growing in 

 shaded forests or floating in 

 ponds have quite different 

 habits from these we have 

 been describing. 



The study of plants in 

 relation to their surround- 

 ings is known as Ecology. Tt seeks to explain the origin of 



l^'Ki. 105. — A aacampseros papyracea, E. 

 M. A, small green leaf with large 

 papery stipule toward the a.xis ; H, 

 The stipule curled back upon being 

 moistened. 



