NUTRITION 



87 



Digestive enzymes are probably secreted by every 

 active plant-cell. In the corn grain the corn starch 

 (endosperm), surrounding the embryo, is digested during 

 germination by diastase secreted by a glandular epithe- 



FiG. 64.— Bladderwort {Utricularia sp.). Aquatic insects are held captive 

 in the tiny floating bladders, where they are digested and absorbed. 



Fig. 65.— a sundew {Drosera intermedia), showing the glandular tipped 

 tentacles on the leaves. When an insect alights on a leaf he is held by 

 the sticky secretion; the tentacles then bend over in contact with his body, 

 holding him more firmly, and pouring out a protein-digesting enzyme 

 secreted by their glands. «= & / 



