12 



PLANT GROWTH 



Fig. 4. Seedlings of hollyhock (left). The smallest seedling shows the early root 

 growth, the next the cotyledons protecting the shoot as it pushed through the ground, 

 and the largest shows the two cotyledons and the shoot between them. Oats (right). 

 The pointed coleoptile pushes through the soil, after which it splits and the true shoot 

 emerges (2/3 natural size). (By Antoinette K. Ketner.) 



