STRUCTURE AND PHYSIOLOGY OF PLANTS 21 



REVIEW. 



1. Name the five parts of a plant. 



2. What two purposes have roots ? 



3. What is the use of the root cap ? 



4. Describe the location and appearance of root hairs 



5. Give several purposes of plant stems. 



6. What are the uses of leaves ? 



7. Draw and describe the structure of the leaf, showing the air cav- 

 ities and the stomates. 



8. What food do plants get from the air ? What do they make 

 from this ? 



9. What plants use sunlight ? How does it help them ? 



10. Tell of the balance in nature in the production and use of 

 carbon dioxide and of oxygen. 



11. Tell how the oxygen supply is produced and used in an aqua- 

 rium in the window. 



12. How do field crops get their water ? 



13. What is osmosis ? 



14. Give one or two examples of osmosis. 



15. How much of the food of plants comes from the air, and how 

 much from the soil ? 



16. From what source is the ash or mineral matter derived? The 

 starch ? 



17. Mention four climatic needs of the growing crop. 



18. Tell of suitable temperatures for the sprouting of corn and of 

 wheat. 



19. What is the effect of no air in the soil, for germinating seeds 

 and for growing crops ? 



20. Tell of the purpose of flowers. 



21. Name the two essential organs of a perfect flower, and give the 

 use of each 



22. Whac are the two chief ways by which pollen is carried ? 



23. Give two ways in which flowers attract bees and other insects. 



24. What is cross pollination ? Of what benefit is it in orchards T 



25. Why should fruit growers keep bees ? 



26. What is the purpose of the germ in a seed ? 



27. Where is the storage matter in the bean ? In the corn kernel ? 



28. Give the life cycle of an annual. 



29. Describe the work each year of the biennial plant. 



30. Define a perennial. Give examples. 



References. United States Farmers' Bulletins: 382, Seed Adultera- 

 tion; 884, Saving Seed. Applied Economic Botany, by Cook (Lippincott) 



