Name: _______________________________
Period: ___
Ecosystems and Energy Review
1. In most ecosystems, the energy originally comes from ____________________.
2. This energy is first captured by plants using the process of ___________________________.
3. This process creates C6H12O6, commonly called _________________, and _________________.
4. Plants require three things to make C6H12O6. They are:
a.
b.
c.
5. So plants are converting _______________________ energy into ______________________ energy.
6. Organisms that create their own food are called _______________________. Organisms that cannot create
their own food, and so eat other things, are called ____________________________.
7. The opposite of the process in #2 is commonly known as breathing. The technical term is
_________________________.
8. What do the arrows in food chains represent?
9. In ecology we no longer use food chains. Instead we use food ________. Why?
10. In the diagram below what are the names of each of the trophic levels?
a. Bottom level:
b. Middle level:
c. Top level:
d. If there were one
more level at the top,
what would it be called?
11. On the diagram in #10:
a. Which level would have the most biomass? In other words, which are there more of in an ecosystem?
b. Why are there more organisms at this level? In other words, what is limiting growth?
12. Organisms that cannot produce their own food are typically organized into four categories:
a. Organisms that eat animals: ____________________
b. Organisms that eat plants: _____________________
c. Organisms that eat both: ______________________
d. Organisms that eat dead material: _______________________
13. _____________________ is when two organisms live in close connection with each other. There are three
kinds:
a. Mutualism is when:
b. Commensalism is when:
c. Parasitism is when:
14. When many species die out all at once it is known as a ___________________________________.
15. Name three different types of pollution humans produce:
a.
b.
c.
16. How have humans affected the ability of environments to sustain living things? Explain using at least one
example.