QUESTIONS 9 



the exhaustion of the oyxgen, calculate what fraction of the air still remains. 

 This is chiefly nitrogen. After the fumes dissolve in the water study the color 

 and other properties of the nitrogen. 



8. Properties of phosphorus and potassium should be studied by follow- 

 ing directions given in some elementary book on chemistry . 



9. A collection of fertilizer materials should be made by getting samples 

 from dealers. Study these as to appearance, composition, and other properties 

 Put the samples in bottles and label plainly. 



10. Leaf Structure. — If a compound microscope is available let each stu- 

 dent study the structure of leaves by first making sections and mounting them 

 in water on glass slips. Surface views should also be mounted to study the 

 stomates. 



11. Bud formation on fruit trees should be observed during the spring 

 season while the leaves and shoots are growing. How soon can you detect the 

 new buds for the following year? Why are they formed so early? 



12. Preparation for Winter. — Try to find on trees all the seven methods 

 mentioned in this chapter by which the tree prepares for winter. 



QUESTIONS 



1. Mention the conditions which influence the growth of plants. 



2. What can you say of their temperature requirements? 



3. What are the three plant societies when classified with reference to moist- 



ure? 



4. How could you prove that plants need air? How do they get it? 



5. Describe examples you have observed showing the light requirements of 



6. What is the office of chloropyll? Where is it found? 



7. What are the best conditions for germination? 



8. What are the uses of roots? 



9. Describe an experiment to show osmosis, and give its analogy to plant 



life. 



10. What are the four most essential elements required in fertilizing soils? 



11. Trace the function of water in the growth of plants. 



12. How do trees prepare for winter? 



13. How can you distinguish between fruit buds and shoot buds on a plum or 



peach tree? 



References. — Foundations of Botany, Bergen. Ginn & Co.; Botany for 

 Secondary Schools, Bailey, Macmillan Co.; Applied Economic Botany, 

 Mel. T. Cook, J. B. Lippincott Co. 



