520 MAN CONTROLS HIS ENVIRONMENT FOR WEALTH 



PROBLEM I. HOW ARE PLANTS USED AS FOOD? 



Leaves as food. Grazing animals feed almost entirely on tender 

 shoots, leaves, or blades of grass. We can realize the economic 

 value of grass when we consider the fact that for the last ten years 

 the hay crop in this country was worth well over $1,000,000,000 a 

 year. And this does not take into account the wild grasses used 

 as forage by numerous grazing animals. 



Certain leaves and buds are used as food by man. Lettuce, 

 kale, spinach, and broccoli are examples. A cabbage head is a 



What vegetables are leaves? Do you know any others? 



Wright Pierce 



large leaf bud. An onion is a compact budlike mass of thickened 

 leaves which contain stored food. 



Practical Exercise 1. Make a table of foods to be filled out from material 

 found in this unit and in books of reference. Fill out the first column of this 

 table by placing in it ten leaves used as food by man. 



FOOD OF MAN 



Leaves 



Stems 



Roots 



Seeds 



Flowers 



Fruits . 















Stems as food. If one were asked to name a stem used as food, 

 he would probably mention either asparagus or celery. Sugar 



