AnswersSY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRUnit Test

Unit Test — Cumulative exam Answers

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1
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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
2
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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.
3

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.
4

Which correctly lists three greenhouse gases?

A
oxygen, carbon dioxide, helium
B
carbon dioxide, nitrous oxide, methane
C
helium, methane, oxygen
D
methane, oxygen, carbon dioxide
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

How does La Niña affect the climate of the Pacific Ocean?

A
The ocean becomes cooler.
B
The warm water moves toward the east.
C
The cold water sinks deeper into the ocean.
D
The strength of the prevailing winds decreases.
7

The image illustrates a human-induced environmental change.

Question illustration
A
pollution
B
wildlife hazard
C
eutrophication
D
non-sustainable harvesting
8

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
9

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.
10

Which substance is a greenhouse gas that is emitted by human activities, is the most widespread, and remains in the air the longest?

A
water vapor
B
methane
C
fluorinated gas
D
carbon dioxide
11

Which factors are causes of short-term climate change?

A
changes in wind and ocean currents
B
an increase of thunderstorms and rain
C
changes in daily wind shifts and snowfall
D
an increase of hurricanes and volcanic eruptions
12

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.
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 of the following are effects of environmental change on an entire species?

A
individual deaths and impacts on growth and development
B
impacts on growth and development and losses of habitats
C
species competition and individual deaths
D
extinction and change in species competition
15

Which chemicals are major contributors to ozone layer destruction? Select two answer choices.phosphorusnitrogenbrominechlorinecarbon dioxidemethane

A
phosphorus
B
nitrogen
C
bromine
D
chlorine
E
carbon dioxide
F
methane
16

Human-induced environmental changes can affect living things at which level(s)?

A
organisms only
B
organisms and populations only
C
species only
D
organisms, populations, and species
17

According to some scientists, which is a cause of global warming?

A
decrease of nitrous oxide
B
increase in cloud cover
C
decrease of methane gas
D
increase in carbon dioxide
18

Which is a nonpoint source of pollution?

A
Tourists throw trash into the ocean.
B
A car mechanic pours oil on the ground.
C
Rain contains chemicals that seep into the ground.
D
A pipe dumps waste from a factory into a stream.
19

Ariel drew a diagram to compare two human-induced environmental changes.

Question illustration
A
Introduces substances into an environment
B
Involves the overhunting of resources
C
Causes organisms to use up resources
D
Results from the building of roads and bridges
20

Which of the following shows the order of events that scientists believe will likely lead to the disappearance of many species?

A
increase in human population, increase in short-term human-induced changes, ozone layer destruction
B
increase in short-term human-induced changes, increase in human population, ozone layer destruction
C
increase in human population, increase in short-term human-induced changes, mass extinction
D
increase in short-term human-induced changes, increase in human population, mass extinction

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