AnswersCR03051B BiologyTest

Test — Cumulative exam Answers

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Review the chart, which shows the population sizes of three African animals in 1990 and in 2000. Population Estimates of Animals in Africa in 1990 and in 2000 19902000Lions100,00047,000Cheetahs25,0007,500Zebras750,000450,000Which explanation is best supported by the numbers in the chart?

A
Lion and cheetah populations compete for the food source of zebras, and lions outcompete cheetahs.
B
The dwindling zebra population has led to the decline of the predator lion and cheetah populations.
C
Overhunting of lion and cheetah populations has led to a decline in the food source population.
D
Lion and cheetah populations compete for the food source of zebras, and cheetahs outcompete lions.
2
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Earth scientists have concluded that the methods of harnessing energy that have been used over the past two centuries, such as the burning of fossil fuels, are causing climates around the world to change more quickly and suddenly than ever before in human history. Evidence includes increased air temperatures, rising sea levels, and the shrinking of glaciers in Greenland, Alaska, and other regions of Earth. The most complex level of organizational hierarchy that climate change could potentially affect is Earth’s

A
biosphere.
B
communities.
C
organisms.
D
populations.
3

White perch is a fish that is native to Atlantic coastal regions and is invasive to the Great Lakes. It feeds on native species and is thought to be the cause of the decline of the Great Lakes walleye fish populations. What was most likely its mode of introduction?

A
produce brought from the eastern states
B
trapped in a ship's ballast or a water tank
C
trapped in a cargo crate carrying nonperishable items
D
luggage brought in an overseas flight
4

Scientists use specific levels of organization to analyze the biosphere. The Everglades consist of a large area of subtropical wetlands in Florida. Various species of plants and animals can be found in the Everglades, including panthers, cypress trees, herons, and alligators.The group of ecosystems on Earth that feature climate, vegetation, and wildlife similar to the Everglades is

Question illustration
A
a biosphere.
B
a community.
C
a population.
D
a biome.
5

Which environmental policy must consider the expensive startup costs associated with building machines that harvest energy from clean sources?

A
reducing air pollution
B
regulating deforestation
C
introducing new farming methods
D
protecting ocean reefs
6

Which human-induced change results in increased competition caused by an initial increase in the number of organisms in a habitat?

A
non-sustainable harvesting
B
nonnative species introduction
C
ozone layer depletion
D
mass extinction
7

Which statement explains how smog forms?

A
Volcanoes erupt and release ash into the sky.
B
Strong storms pick up soil and mix it with fog.
C
Sunlight and heat react with gases in the atmosphere.
D
Gases move high into the atmosphere and then fall to Earth in rain.
8

The image illustrates a human-induced environmental change.

Question illustration
A
pollution
B
wildlife hazard
C
eutrophication
D
non-sustainable harvesting
9

Why is urbanization contributing to pollution?

A
People in urban areas strip the soil of nutrients and make it difficult to grow crops.
B
People in urban areas consume more energy, food, and water.
C
People in urban areas remove minerals and metals from the ground, which increases erosion.
D
People in urban areas log forests and mine, which causes climate change.
10

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
11

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?

Question illustration
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.
12

Which best matches objects that a scientist would include on a list describing a forest ecosystem?

A
different types of animals and plants and the forest soil
B
one animal species, the soil, water, and nutrients
C
all the living things in the forest ecosystem
D
different types of soil, rocks, and water sources in the forest
13

How does the construction of dams positively affect natural resources?

A
by providing water for irrigation and restoring trees to areas where forests once existed
B
by creating reservoirs, preventing flooding, and renewing destroyed ecosystems
C
by preventing flooding, creating reservoirs, and providing water for irrigation
D
by renewing destroyed ecosystems and restoring trees to areas where forest once existed
14

Which statement describes the current theory about the relationship between the human population and mass extinction?

A
The human population is increasing, so the likelihood of a mass extinction is also increasing.
B
The human population is increasing, so the likelihood of a mass extinction is decreasing.
C
The human population is decreasing, so the likelihood of a mass extinction is also decreasing.
D
The human population is decreasing, so the likelihood of a mass extinction is increasing.
15

What is the difference between a community and a population?

A
A community has only one organism, while a population has many organisms.
B
A population has only one ecosystem, while a community has many ecosystems.
C
A community has only one biome, while a population has many biomes.
D
A population has only one species, while a community has many species.
16

Which best explains the effect of reforestation on land?

A
It allows crops to grow in wide steps along slopes.
B
It turns land slowly into desert.
C
It turns habitable land uninhabitable.
D
It restores trees to areas where they once grew.
17

In the 1980s laws were passed to reduce the amount of certain chemicals used by companies and individuals. According to these laws, the use of chlorofluorocarbons, or CFCs, should be reduced and eventually eliminated. These compounds contain chlorine and cause problems when released into the Earth’s atmosphere.

A
nonnative species introduction
B
non-sustainable harvesting
C
ozone layer depletion
D
eutrophication
18

A scientist is conducting research about all the plants and wildlife in the Mojave Desert as well as the desert’s resources, such as water and soil. The scientist is studying

A
a community.
B
a population.
C
a species.
D
an ecosystem.
19

What is one way people positively affect water resources?

A
polluting from nonpoint sources
B
increasing farming and construction
C
disposing of chemicals in water
D
limiting use of acid and other pollutants
20

A coral reef, shown below, is an underwater structure that is home to many sea animals that use the water as a resource. Some animals are called stony corals because they have hard bodies that resemble rocks. Stony corals provide protection to other animals that live on the reef.Which is the largest organizational level found in one coral reef?

Question illustration
A
organism
B
population
C
ecosystem
D
biome

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