QUESTIONS ON WHERE PLANTS GROW 211 



Explain immersed, emersed, free-swimming. What is plankton? Ex- 

 plain terrestrial. Amphibious. Why are some plants rare or local? 

 Why are some plants common? Name some unusual places in which 

 you have seen plants growing. Give examples of how plants occupy 

 the new places. How do plants aid in the formation of soil? Explain 

 what is meant by peat, muck, humus. How are peat bogs formed? 

 What relation have plants to scenery? 



377. A landscape with vegetation. Holland. 



