AnswersTX-Biology B-CRUnit Test

Unit Test — Unit test Answers

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The map shows the distribution of wild boars in the United States (shaded area). Which of these facts about wild boars is best supported by the evidence provided?

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A
Wild boars were brought to the United States by humans.
B
Wild boars have quickly spread through the United States.
C
Wild boars have established successfully mostly in areas with warm climates.
D
Wild boars have a high reproductive rate and no natural predators.
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Wolves are predators of deer. What is most likely to happen to the deer population if the wolf population increased?

A
stay the same
B
increase
C
decrease
D
become extinct
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Rainforests around the world are being cleared at an alarming rate to make room for new communities, agriculture, mining, and roads, and to provide lumber for construction and furniture. How might the destruction of rainforests affect the balance of gases in Earth's atmosphere?

A
by increasing carbon dioxide and decreasing oxygen
B
by increasing carbon dioxide and increasing oxygen
C
by decreasing carbon dioxide and increasing oxygen
D
by decreasing carbon dioxideand decreasing oxygen
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48

What best describes the association between the carbon cycle, plants, and animals?

A
Plants fix carbon and release oxygen, and animals release carbon and use oxygen.
B
Animals fix carbon and release oxygen, and plants release carbon and use oxygen.
C
Animals fix carbon through respiration, and plants fix carbon through photosynthesis.
D
Plants decompose fixing carbon, and animals decompose releasing carbon.
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What is the difference between food chains and food webs?

A
Food webs show the flow of energy from producers to consumers, and food chains show the flow of energy from consumers to producers.
B
Food chains show a single path of energy in an ecosystem, and food webs show overlapping pathways of energy in that ecosystem.
C
About ten percent of the energy is passed on to the next trophic level in food webs, but in food chains, about ninety percent is passed on to the next trophic level.
D
Heat is lost when energy is passed on to the next trophic level in food chains, but in food webs, heat is not lost when energy is passed on to the next trophic level.
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Which molecule would be the most affected by limited nitrogen?

A
myofibrillar proteins in muscle
B
glucose molecules in starch
C
fat molecules surrounding organs
D
cellulose molecules in plant cell walls
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54

What would happen to the size of the carnivore population if the herbivore population increased?

A
decrease
B
increase
C
die off
D
stay the same
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56

What is a snake that eats a mouse an example of?

A
predation
B
competition
C
mutualism
D
parasitism
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As human travel increases, the number of introduced species likely

A
decreases.
B
increases.
C
stays the same.
D
is eliminated.
58

Which organisms are heterotrophs?

A
photosynthesizers
B
producers
C
consumers
D
plants
59

Which is a sustainable practice?

A
operating wind farms
B
clear cutting
C
flood irrigation
D
overfishing
60

Which describes the greenhouse effect?

A
an artificial process
B
a dangerous process
C
a natural process
D
a new process

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