7 Science - Ecosystems Test |
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Write or print neatly and use complete sentences when appropriate. |
1. Draw a food web for a pond ecosystem.
2. List 2 abiotic and 2 biotic factors in a pond ecosystem .
3. Use the bank of words to help you fill in the blanks.
a) An organism that can make it's own food is called a
b) A consumer that eats other animals is called
c)A _____________ is a collection of related ecosystems.
d) Products that break down very slowly and do not provide food energy for the growth of decomposers.
e) _____________ are chemicals designed to reduce the
populations of unwanted plant and animal organisms.
4. Answer "TII for True and "FII for False for the following statements :
a) _ Polar bears are more active in the summer.
b) _ Polar bears feed mostly on seals.
c) _ The polar bear is considered a marine mammal.
5. In your own words, define the following terms:
Global warming:
Greenhouse effect:
6. A lake was checked in 1907 and again in 2007. Fish were lIected and the followina data were obtained
year |
ph |
trout |
salmon |
bottom |
|
|
|
|
feeders |
1907 |
6.7 |
40 |
18 |
12 |
2007 |
4.2 |
20 |
0 |
10 |
What happened to the acidity of the lake?
What conclusions can you draw about the effect of acid rain on fish?
7. Write a brief essay (half page) about what it means to be
environmentally responsible ,
Now that you are finished ...
Read p. 317-319 quietly.
Homework: Explain in your own words what you think is happening in figure 2.