AnswersAEC 4340 BiologyIIEcologyTopic Test

Topic Test Answers

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1
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How does water enter the atmosphere?

A
Liquid water evaporates from lakes when heated by the sun.
B
Frozen water sublimates from ice and snow.
C
Liquid water is lost from tree leaves during evapotranspiration.
D
All of the above.
2
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The sun is the ultimate source for energy on the Earth.

A
T
B
F
3

__________ helps organisms transport nutrients.

A
Soil
B
Sap
C
Water
D
Wind
4

Carbon in the ocean originates from the atmosphere.

A
T
B
F
5

How are the carbon, oxygen, and nitrogen cycles vital to sustaining life on Earth?

A
Carbon, oxygen, and nitrogen are vital components of life on Earth.
B
The carbon, oxygen, and nitrogen cycles allow vital elements to return to usable form by organisms.
C
The carbon, oxygen, and nitrogen cycles are an important interface between biotic and abiotic factors.
D
All of the above are reasons the carbon, oxygen, and nitrogen cycles are vital to life on Earth.
6

Which of the following cycles is crucial to living organisms?

A
phosphorus
B
water
C
carbon
D
all of the above
7

How is nitrogen returned to the atmosphere during the nitrogen cycle?

A
It is returned to the atmosphere in a process called nitrogen fixation.
B
It is returned to the atmosphere through denitrification.
C
It is returned to the atmosphere through cellular respiration.
D
It is returned to the atmosphere through evapotranspiration.
8

A large portion of precipitation in the rainforest occurs as a result of _______.

A
perspiration
B
respiration
C
oxidation
D
transpiration
9

Which of the following can be natural sources of water pollution?

A
volcanic activity
B
earthquakes
C
algae blooms
D
all of the above
10

Phosphorus plays an important role within the structures of the body. Which of the following structures is phosphorus found in?

A
bones
B
cell membranes
C
DNA
D
all of the above
11

Biogeochemical cycles on Earth serve a variety of different purposes. What do the biogeochemical cycles have in common?

A
They all serve the same function in sustaining life on Earth.
B
They all include only nonliving components of an ecosystem.
C
They are all essential for sustaining life on Earth.
D
They all include only living components of an ecosystem.
12

What happens to groundwater when the rate of infiltration is less than the rate of water being pumped out of the ground?

A
The water table is unchanged.
B
The water table increases.
C
The water table lowers.
D
The water table is unaffected by infiltration.
13

The cycling of carbon throughout the environment is critical to ensuring the survival of all organisms. Suppose a mountain lion kills a deer in the forest. Photo by US Department of Agriculture What would likely happen first to the carbon in the deer carcass as it lies on the forest floor after the mountain lion has finished feeding on it?

Question illustration
A
It would be incorporated into other organisms.
B
It would be released back into the atmosphere.
C
It would be turned into coal.
D
It would be incorporated into the soil.
14

Which of the following does not take place in the water cycle?

A
precipitation
B
evaporation
C
carbonation
D
condensation
15

The carbon cycle involves an exchange of carbon between the atmosphere and geosphere only.

A
T
B
F
16

Plants in the rainforest _______.

A
effectively conserve and retain water
B
have low levels of transpiration
C
release 50-80% of their water back into the ecosystem
D
are adapted to conditions of drought
17

Fluctuations in the phosphorus cycle in aquatic ecosystems _______.

A
can lead to changes in the growth rates of aquatic populations
B
are never caused by human impact on the environment
C
lead to a decrease in the amount of phosphorus found in sediment
D
never occur naturally
18

The biogeochemical cycles move through biotic and abiotic regions.

A
T
B
F
19

Cycles are essential to all living organisms.

A
T
B
F
20

What is desertification?

A
method of using desert land for agriculture
B
the process of turning arable land into deserts
C
drying up of stream beds and lakes
D
the expansion of current deserts land areas

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