SELF-TESTING EXERCISE 



127 





Brooklyn Botanical Garden, Brooklyn, N. Y. 

 The upper picture shows date palms growing in Algeria ; the lower left shows a white oak 

 tree ; and the lower right shows a white pine tree. Why are these trees classified as mono- 

 cotyledons, dicotyledons, and polycotyledons respectively. 



Self-Testing Exercise 



Seed plants are divided into three groups : (1), (2), 



and (3). In the first, the food is stored in the (4), 



while in the second group it is in the (5). Corn is a (6), 



while the bean is a (7). The pine is an example of a 



(8). 



