84 INTRODUCTION TO BOTANY 
5. Would you expect to find any kind of compass plants in wood- 
lands? Why? 
6. Why do most aquatic flowering plants have leaves that are ex- 
posed to the air, rather than submerged leaves? 
7. Why are trees of the moist tropical regions usually evergreen? 
8. May a shrub or a tree be deciduous or evergreen, according to 
circumstances? Give examples. 
9. If you wanted to make a cactus plant produce leaves, how would 
you treat it? Why? 
10. If an aquatic plant were transplanted into desert soil and an 
extreme xerophyte into a shady swamp, what appearances would in 
each case soon show that the plant was dying? 
11. What mesophytes do you know that can grow under a very wide 
range of conditions as regards light and moisture? Compare, with 
regard to their tolerance of drought, some common plants important in 
agriculture. 
