HOW PLANTS GROW 17 



QUESTIONS 



1. Name the 10 elements essential for plant growth and 4 others which are 

 commonly found in plants. 



2. Make a sketch of a growing plant, showing where it secures each essen- 

 tial element. 



3. How do legumeis indirectly use free nitrogen gas from the air? 



4. How are the first simple plant compounds formed? 



5. Define carbohydrates. State what classes of compounds are included in 

 this group and tell what you can about each. 



6. How do fats and carbohydrates differ in composition? 



7. Distinguish between crude protein, proteins, and amids. 



8. Why do not the amids accumulate in the plant during its growth? 



9. In analyzing feeding stuffs, what groups of plant substances do chemists 

 usually determine? 



10. How is the amount of each found? 



11. What is meant by concentrates and roughages? 



12. Discuss the storage in the growing corn plant of the various nutrients, 

 especially the carbohydrates. 



