Plant Biology?

My textbook was woefully insufficient with assistance. Thanks for the help.

1. One would predict that a plant in a tropical rainforest (where rain is plentiful and plant density is high) would have _____.

a. a relatively deep root system and a large shoot system
b. a relatively shallow root system and a small shoot system
c. a relatively deep root system and small shoot system
d. a relatively shallow root system and a large shoot system


2. What structure serves to protect the tree?
   
a. secondary phloem
b. vascular cambium
c. wood
d. bark