QUESTIONS AND SUGGESTIONS 87 



assumes a form different from its predecessors. Its un- 

 folding leaf-like parts do not all turn green. Some of them 

 show white, or delicate shades of blue or pink or yellow. 

 This new kind of little branch does not continue to elongate. 

 In the center of its tip appear organs which do not look 

 like leaves at all, though they follow the rule of leaves in 

 the manner of their birth. From the swollen tips of some 

 of these a soft powder escapes. It is the pollen. The 

 flower has appeared, and the plant has entered upon the 

 second stage of its existence. It is ready for the task of 

 reproduction. 



SECTION 22. i. Make a list of the wild plants whose fruits, roots, 

 or other parts you have eaten. 2. What wild plants do you know 

 which are used for medicine? What parts are used? 3. At what 

 time of year are maple trees tapped ? How is this done ? 4. What 

 plants do you know which have hollow stems ? 5. What plants do 

 you know which have pith in the stems ? 6. What plants have stems 

 which are good to eat ? 7. Of the trees that you know, which kinds 

 have the largest stems? Which have hard wood? Which have 

 soft wood ? Which are most valuable for lumber ? 8. What kind 

 of wood is easiest to whittle ? Why ? What kinds are best for 

 floors ? Why ? 



SECTION 23. i. What are cells? To examine them, how would 

 you proceed? 2. Describe protoplasm. 3. What is a protoplast? 

 4. Define cytoplasm and nucleus. What appears to be the division 

 of work between them? 5. Define chloroplast and chlorophyll. 

 6. Define vacuole and sap. 7. What is turgidity and how is it pro- 

 duced ? 8. What is meant by differentiation ? How is it illustrated 

 in plants ? 9. What are the principal processes performed by stomach, 

 lungs, and heart? Are these processes also performed in the body 

 of a plant ? If so, by what parts ? 



SECTION 24. i. What is a tissue ? Give examples. 2. How many 

 different kinds of tissue can you observe in a banana ? In an orange ? 



