Week 5 Test Answers

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1
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Which of the following is true about the efficiency of energy transfer in an ecosystem?

A
The more energy the organism requires, the more efficient the energy transfer.
B
All energy transfers have the same efficiencies.
C
The less energy the organism requires, the more efficient the energy transfer.
D
The most efficient energy transfers are in large, warm-blooded animals.
2
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Using prescribed wildfires can prevent natural wildfires from posing as great a risk to property owners.

A
T
B
F
3

Which of the following best explains why ecosystems need a continual influx of new energy?

A
Photosynthesis feeds herbivores, carnivores, and decomposers.
B
As energy is recycled, a small amount is lost as heat.
C
Energy flows through an ecosystem and cannot be recycled.
D
Cellular respiration does not feed back into other processes.
4

Which of the following statements about wildfires in deciduous forests is not true?

A
Deciduous forests are unaffected by wildfires.
B
Lichen and moss growth increases in deciduous forests as a result of wildfires.
C
Nutritional quality of new growth increases temporarily after a wildfire.
D
The quantity of trees in deciduous forests is unaffected when it occurs less than once every five years.
5

What is the effect of wildfires on biodiversity?

A
temporary decrease, but long-term increase
B
temporary increase, but long-term decrease
C
increases
D
decreases
6

By which process do plants obtain carbon from the atmosphere?

A
photosynthesis
B
cellular respiration
C
decomposition
D
consumption
7

Which shows the most direct path that carbon can take through the carbon cycle?

A
plant ® atmosphere ® animal
B
animal ® plant ® atmosphere
C
plant ® animal ® atmosphere
D
atmosphere ® animal ® fossil fuel
8

Which process is performed by both plants and animals to break down sugars to provide energy in the form of ATP?

A
photosynthesis
B
cellular respiration
C
consumption
D
decomposition
9

Which macromolecule is the main source of energy for living things?

A
fat
B
nucleic acid
C
protein
D
carbohydrate
10

Explain why energy in most ecosystems must flow from the sun, then to autotrophs and finally to heterotrophs, in that order.

Answer not available
11

Explain why cold-blooded organisms like reptiles have a higher rate of secondary productivity than warm-blooded mammals.

Answer not available
12

Explain how wildfires help restore soil nutrients to forest ecosystems.

Answer not available
13

Wildfires benefit forest ecosystems by _______.

A
stimulating growth
B
reducing underbrush
C
stimulating plant reproduction
D
all of the above
14

Which of the following is not a direct fate of the energy flowing through photosynthesis?

A
carnivores
B
cellular respiration
C
herbivores
D
heat sinks
15

What are some possible consequences of preventing prescribed burns and natural wildfires?

Answer not available

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