QUESTIONS AND SUGGESTIONS 67 



it begins to grow again. And this food is also the principal 



source of food for mankind. It is for the food in their 



seeds that men cultivate rice and 



wheat, corn and oats, barley and 



rye. So in seeds we have not only 



the means to create crops of value ; 



we have also the most valuable crop 



itself. 



QUESTIONS AND SUGGESTIONS 



Section 12. 1. State your idea of what 

 a seed is. 2. Of what uses are seeds to 

 plants? 3. Name the kinds of seeds you 

 can identify when you see them. 4. Name Fig. 23. — Diagram of a sec- 

 seeds which are used for food. 5. Do you tion taken through a grain 



know any uses of seeds to man except for of corn near one of its broad 

 . , . . . _, Tr . .. , surfaces. The oval struc- 



food and planting ? If so, describe them. ture in the Wr part is a 



6. What plants do you know, other than suce through the embryo. 



those named in the text, which do not 



produce seed? 7. In what month do most seeds ripen? 8. Where 



you live when does corn ripen ? When does wheat ripen ? 9. What 



are some of the crops whose seeds are not allowed to ripen ? 



10. Does the size of a seed seem to bear any relation to the size of 



the plant which produces it? n. Find out what you can about 



how seeds are stored in order to keep them in good condition. 



12. How is seed corn stored? How is it tested before planting? 



13. Will young seeds grow as well as seeds which have been kept 

 over winter? 



Section 13. 1. What are the things which you and a plant must 

 both do in order to keep alive ? 2. Describe a life relationship of 

 plants which is not found among animals. 3. Does grass grow where 

 the shade is dense ? Describe the appearance of grass after it has 

 been covered for a few days. 4. Describe the shape of a plant which 

 is kept indoors with the same side constantly toward the window. 

 5. What are the principal things which plants seem to try to do? 



