AnswersFL-2000310-Biology 1 Sem 2 - FlexHuman Impact on the Environment

Week 5: Fire and Nature Answers

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1
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Why have forest fires in ponderosa pine forests become more damaging to that ecosystem than they were historically?

A
Following a policy of fire suppression in these forests makes fires burn hotter.
B
Fires in ponderosa pine forests are generally low-intensity fires.
C
Following a policy of fire suppression in these forests clears out underbrush..
D
Forest fires are a natural part of ponderosa pines forest ecosystems.
2
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Which of the following is not a benefit of wildfires to ecosystems?

A
habitat loss
B
underbrush reduction
C
new growth
D
plant regeneration
3

Prescribed burns are used to _______.

A
clear out undergrowth
B
prevent larger forest fires
C
manage forests
D
all of the above
4

How are the benefits of wildfires in deciduous and northern forests similar?

A
increased tree quantity
B
increased amount of lichens
C
increased nutritional value of growth
D
all of the above
5

Which of the following statements about the use of prescribed fires in the Everglades is true?

A
It controls the amount of moisture in the environment.
B
It controls the spread of exotic organisms.
C
It helps maintain plant communities.
D
All of the above
6

Soil _______ as a result of wildfires in grasslands.

A
improves
B
degrades
C
is unchanged
D
is lost
7

How are forest fires beneficial to conifers like Jack Pines?

A
Jack pine seeds are protected by forest fires.
B
Pine cones are carried on the winds produced by forest fires.
C
Forest fires release the seeds stored in Jack pine cones.
D
All of the above.
8

How do wildfires help control plant disease?

A
Wildfires are more likely to kill off plants that are likely to spread disease.
B
Wildfires help control populations of fungi and insects that can lead to plant disease.
C
Wildfires thin underbrush which leads to plant disease.
D
All of the above
9

Which of the following statements about prescribed burns is true?

A
Prescribed burns will always have detrimental effects on ecosystems, but should be used to protect homes.
B
Prescribed burns are necessary for preventing natural wildfires.
C
Prescribed burns can help maintain healthy ecosystems.
D
None of the above
10

Fire ecology is _______.

A
an old branch of science
B
a way for scientists to prevent accidental wildfires
C
the study of how fire affects ecosystems
D
all of the above

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