1. True or false? The Amazon rainforest has nutrient-poor soils.

2. True or false? Trees in temperate rainforests and tropical rainforests are mostly evergreen.

3. True or false? The geographic distribution of the boreal forest, tundra, tropical alpine scrubland, and tropical savanna all are controlled by low temperatures.

4. True or false? Of all the biomes, deserts have the lowest biomass and tropical rainforests have the highest biomass.

5. True or false? At small spatial scales, climate is the most important determinant of vegetation structure.

6. Multiple choice: Which of the following biomes is characterized by summer drought, winter rain, and frequent fire?

7. Multiple choice: Which of the following biomes is treeless due to chronic moisture deficits, grazing, and fire?

8. Multiple choice: Today, the most important agent of extinction is

9. Fill in the blank: _____________ marks the uppermost elevations of trees in mountains.

10. Fill in the blank: An _____________ is a plant that lives on other plants.