AnswersFL-2001340-Environmental Science BHuman Impact on the Environment

Human Impact on the Environment — Unit test Answers

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1
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How would a harsh winter most likely affect the rabbit population size?

A
population decreases
B
population increases
C
population reaches carrying capacity
D
population completely dies off
2
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How could the loss of biodiversity affect humans?

A
It may cause an increase in the human population as competition is reduced.
B
It may lead to the loss of potential medicines, foods, and products.
C
It could lead to a decrease in infectious and other diseases that affect humans.
D
It could cause a decrease in the amount of pollutants on the planet.
3

Actinobacteria sp. are organisms called chemoorganohetereotrophs. They do not use oxygen to breathe. They break down organic material and convert it to inorganic material.Which part of the carbon cycle does this describe?

A
photosynthesis
B
respiration
C
decomposition
D
assimilation
4

A population of zebras experienced ten births, six deaths to predation, three deaths to disease, three individuals joining the population, and zero individuals leaving. What is happening to the population growth?

A
It is increasing.
B
It is decreasing.
C
It is staying the same.
D
It reaches carrying capacity.
5

A population of wolves in Wyoming experienced a rapid decline. Scientists found that 20 wolves died from rabies, 15 wolves died from mange (a parasitic mite), and 10 wolves died from natural causes. Wyoming experienced a recent drought, and many populations, including deer, bison, and bear, have diminished in the past year. What is best described in this scenario?

A
Wolves reached their greatest population growth.
B
Wolves were exposed to too many limiting factors.
C
Wolves were unaffected by other populations in Wyoming.
D
Wolves’ breeding season was affected by the drought.
6

Which statement best compares the carbon cycle and the nitrogen cycle?

A
Both cycle water from Earth's surface to the atmosphere.
B
Both involve the work of decomposers.
C
Both release oxygen as a waste product.
D
Both require fixation in order to convert molecules.
7

What could explain the curve in this population growth graph?

Question illustration
A
an unlimited food supply
B
a natural disaster
C
a population crash
D
a reduction in predators
8

Humans process some foods by adding chemicals to reduce harmful bacterial growth. This allows foods to be edible for longer periods of time. Which best describes the advantages of food processing?

A
control of density-independent limiting factors such as disease spread
B
control of density-dependent limiting factors such as disease spread
C
control of density-dependent limiting factors such as predation
D
control of density-independent limiting factors such as predation
9

Which of the following could result in secondary succession?

A
the formation of a tall sand dune on a previously grassy beach
B
a vast glacier in motion forming a U-shaped valley in its wake
C
a volcanic eruption that covers most of what used to be a forest
D
an introduced species that destroys all the native plants in an area
10

What most likely happened to the population of deer in 1963 and 1964?

Question illustration
A
The population increased its death rate.
B
The population exceeded past carrying capacity.
C
The population crashed down to 0.
D
The population steadily increased to get closer to carrying capacity.
11

What could explain the curve in this population growth graph?

Question illustration
A
an unlimited food supply
B
a natural disaster
C
a population crash
D
a reduction in predators
12

The size of a food chain can vary, but the number of levels that a food chain can reach is limited.Why does this limit exist?

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.
13

What most likely happened to the population of deer in 1963 and 1964?

Question illustration
A
The population increased its death rate.
B
The population exceeded past carrying capacity.
C
The population crashed down to 0.
D
The population steadily increased to get closer to carrying capacity.
14

What is the primary source of energy in a food chain?

A
oxygen
B
sun
C
carbon dioxide
D
water
15

How does mining impact the environment?

A
It has a positive impact on the environment by permanently altering the ecosystem.
B
It has a positive impact on the environment by releasing chemicals into the environment.
C
It has a negative impact on the environment by allowing toxic chemicals to harm wildlife.
D
It has a negative impact on the environment by providing new niches for wildlife to inhabit.

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