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Interactions Of Organisms
Test Description: Interactions of organisms in an ecosystem
Instructions: Answer all questions to get your test result.
1) Different species of birds build nests in the same type of trees. This is an example of __.
A
mutualism
B
competition
C
commensalism
D
predator - prey
2) 'Athlete's foot' fungus causes your toes to itch and burn. This is an example of ____.
A
predation (predator-prey)
B
mutualism
C
commensalism
D
parasitism (parasite-host)
3) A hawk sits on a telephone line watching for mice. This is an example of ____.
A
commensalism
B
predation (predator-prey)
C
parasite-host
D
mutualism
4) A squirrel lives in an oak tree. The squirrel is provided food and shelter while the tree is not harmed. This is an example of ___.
A
parasitism (parasite-host)
B
mutualism
C
commensalism
D
predation (predator-prey)
5) Sea anemones ride on the shells of hermit crabs. The anemones fend off octopuses, which eat crabs. The crabs drive away starfish and other anemone predators.
A
mutualism
B
commensalism
C
competition
D
predation (predator-prey)
6) The tapeworm lives in the intestines of the dog, obtaining nutrients that normally would have been used by the dog.
A
mutualism
B
parasitism (parasite-host)
C
predation (predator-prey)
D
competition
7) If there is a drought which kills most of the producers in an ecosystem, which of the following is true?
A
The numbers of producers and secondary consumers will decrease; the primary consumers will increase.
B
The numbers of producers and primary consumers will decrease.
C
Only the numbers of producers will decrease, since they need water to live.
D
All organisms in the ecosystem will decrease in number.
8) There are less numbers of organisms on each level as you move up an energy pyramid because___.
A
only 10% of the energy is used by the previous level of organisms.
B
the consumers would fight each other for the food.
C
only 10% of the energy from the previous level is available for them to use.
D
they are eaten by the next level.
9) Why are decomposers important to the consumers in an ecosystem?
A
Decomposers are necessary for photosynthesis.
B
Decomposers recycle nutrients needed by the producers.
C
Decomposers keep the earth clean.
D
Decomposers provide nutrients for the consumers.
10) In a food web, the arrows represent ____.
A
food transfer
B
who eats what
C
energy lost
D
energy transfer
*select an answer for all questions
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