QUESTIONS 133 



seeds, give the same amount of water from time to time, keep in a warm 

 room, but keep one in the light and one in the dark ( closet or box ) . Note 

 the time of germination and rate of growth. 



QUESTIONS 



1. Name the four most important factors in plant growth. 



2. Tell of the importance of water in plants. 



3. What are the hydropliytos? Give examples. 



4. What are the mesophytes? Give examples. 



5. What are the xerophytes? Give examples. 



6. What are the halophytes? 



7. What are the tropophytes? 



8. How may plants olitain the nitrogen found in air? 



9. What elements arc likely to be deficient in some soils? 



10. How does temperature att'ect growth of plants? 



11. Tell of the influence of light on plant growth. 



12. Make a list of plants that thrive in partial shade. 



13. Make a list of common food plants and tell in what part of the 

 United States or of the world they are grown. 



14. Same for common fibre plants, ^^'hy are thoy not grown over 

 wider ranges of country? 



15. What are some of the geographic influences governing the plant 

 life of a region? 



