PROBLEM QUESTIONS 81 



Problem (Questions 



1. Why is the root call('<l I lie iiioulh of a plant? 



2. From where would wat(M' come tiial roots take in? 



3. How could water pass from the root hairs into the woody 

 center of a root? 



4. What has osmosis to do with plant mitrition ? 



5. What has osmosis to do with our own nutrition ? 



6. How do you know gravity affects roots? 



7. Why might forests have an effect upon the climate of a 

 given part of the country? 



8. Why is it important not to cut down trees near the sources 

 of our rivers ? 



9. What do roots have to do with the holding and distribu- 

 tion of water? 



10. Why do peas and beans contain a large amount of nitroge- 

 nous food ? 



11. Very much larger yields are had from crops in some pai'ts 

 of the world than in others. How do you account for this? 



12. Why do some farmers plant beans or cowpeas in their 

 corn fields between the hills of corn? Is the custom good or bad? 

 Explain. 



13. What plants store food in their roots? 



14. How do foods become stored in roots? 



15. For what reason should a city boy or girl study about 

 roots ? 



16. Why do farmers plant seeds a short distance below the sur- 

 face of the ground? 



17. Why do farmers cultivate (break up) the soil? 



18. What is the reason for placing dead leaves or other dead 

 organic matter on the surface of the ground early in th(^ winter? 



19. What is weathering? How does it affect rocks? 



20. Find the factors that influence the making of soil. 



21. Why should plants not be crowded togetlu>r in the soil? 



22. What kinds of soil retard evaporation? Why? 



23. Why do we hear so much nowadays of going back to the 

 soil ? What does this term mean ? 



HUNTER LAB. PROB. — G 



