68 THE PLANT: A GENERAL EXTERNAL VIEW 



6. What are the two great tasks of all living things ? Describe them. 



7. Do you know any structures, other than seeds, by means of which 

 plants are reproduced ? If so, describe them. 



Section 14. i. Define nutrition. 2. What are the external con- 

 ditions which are necessary to your life? 3. What are the lowest 

 and highest temperatures we can endure without great discomfort? 

 4. Why is sunlight necessary to your life ? 5. What is food ? 6. Where 

 do green plants get their food ? 7. What is digestion ? 8. What is 

 assimilation? 9. What is photosynthesis? 10. What do the dif- 

 ferent parts of the word photosynthesis mean ? 1 1 . Is photosynthesis 

 the only process by means of which food is made ? Explain your 

 answer. 12. What is an organ? 13. What is a function? 14. Ex- 

 plain how an organ which protects may be properly considered an or- 

 gan of nutrition. Give an example. 1 5. Define species, genus, family. 



Section 15. i. Describe the way roots grow. 2. What things 

 affect their growth? 3. Compare them with stems. 4. What is 

 meant by response ? 5. Compare as to length the above-ground and 

 underground parts of a plant. 6. Describe the appearance of a 

 young root. 7. What are the principal functions of roots ? 8. What 

 parts of roots do the work of absorption ? 9. Why cannot all parts 

 of the roots absorb ? 10. Give some idea of the amount of water 

 absorbed by the roots. 11. Of what advantage is it to the plant to 

 use roots for storage? 12. What advantages have roots over stems 

 as places of storage ? 13. Name some plants other than radish which 

 have fleshy roots. 14. Are the organs of living things limited to 

 certain functions ? Illustrate your answer with examples of roots. 

 15. Give and describe examples of the use of underground parts of 

 plants in reproduction. 16. Define tuber and give an example. 

 17. Define bulb and give an example. 18. Are there any roots which 

 give rise directly to new plants while continuing their ordinary func- 

 tions ? Give examples. 



Section 16. 1. Compare stems with roots as to the way in which 

 they grow, and as to the work which they do. 2. What are nodes ? 

 3. What are internodes? 4. What stems do you know, besides that 

 of corn, which show nodes and internodes plainly? 5. Describe leaf 

 work done by stems. Give examples. 6. What sort of positions do 

 you consider of advantage to fruit? Why? 7. Describe uses of 

 stems to man. 8, What is forestry ? 



