AnswersCO-Biology B-CRUnit Test

Energy Flow in Ecosystems Answers

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1
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Food chains show energy transfer between organisms. The size of a food chain can vary, yet there is a limit to the number of levels that a food chain can reach. Why is there a limit to the number of levels that a food chain can reach?

A
Plants are not infinite in number.
B
Producers are limited by consumers.
C
Carnivores are too large to be eaten.
D
Energy is lost at each trophic level.
2
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Why are mushrooms important to the food chain?

A
They recycle nutrients into the ecosystem.
B
They produce food energy for other living things.
C
They recycle oxygen into the atmosphere.
D
They consume excess herbivores in the ecosystem.
3

Which organism is a primary consumer in the food web below?

Question illustration
A
herbivorous duck
B
bald eagle
C
osprey
D
vegetation
4

Which is the primary consumer in this food chain?

Question illustration
A
rabbit
B
grass
C
snake
D
hawk
5

Which kind of organism is an autotroph?

A
consumer
B
producer
C
decomposer
D
herbivore
6

From the producer level to which level does energy flow directly?

A
decomposer
B
tertiary consumer
C
secondary consumer
D
primary consumer
7

In the food chain below, which is the producer?grass mouse snake hawk

Question illustration
A
grass
B
mouse
C
snake
D
hawk
8

Which is an interconnection of food chains in an ecosystem?

A
food web
B
trophic chain
C
energy web
D
producer web
9

Maggots feed on dead and decaying organisms for energy. What are maggots?

A
autotrophs
B
producers
C
decomposers
D
heterotrophs
10

A diagram illustrates that grass is eaten by insects, birds, and mice. The insects are eaten by hawks, snakes, and toads. The birds and mice are eaten by foxes, hawks, and snakes. The toad is also eaten by the snake. Which best describes the diagram?

A
pyramid
B
food chain grid
C
food web
D
trophic level

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