694 



LIGHT AND LIFE 



DARK 



12 3 



Sucrose concentration (%) 

 Fig. 5. Effect of sucrose concentration on the growth of green pea 

 stem sections in light and dark. 



Apical 5 mm 

 Q " 4mm 



'o " 3mm 

 II 2 mm 



Fig. (). Effect of indole acetic acid {\.\.\) concentration on the growth in iength 

 of terminal etiolated pea stem sections of various lengths. 



