AnswersScience 7 B M12 2526 S2Unit Test

Unit Test — Unit test Answers

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What is an ice age?

A
a recent increase in the average global temperature near Earth’s surface
B
a period of time when temperatures across the planet are colder than normal
C
a characteristic of winter that returns seasonally
D
the loss of heat in coastal areas from La Niña storms
2
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Which best describes primary succession?

A
the quick introduction of a species to an area where none exist
B
the quick introduction of a species to an area where organisms already exist
C
the gradual introduction of a species to an area where none exist
D
the gradual introduction of a species to an area where organisms already exist
3

This Venn diagram is being used to compare pioneer species and climax communities.

Question illustration
A
often involve many species
B
often involve lichens
C
feature very stable environments
D
feature very diverse environments
4

A change occurs in an environment that lasts for three days and causes an immediate, dramatic impact. What can be known about this change?

A
It is a short-term change.
B
It is a long-term change.
C
It is a flood.
D
It is an ice age.
5

Which is an effect of short-term environmental changes?

A
adaptation
B
speciation
C
extinction
D
death
6

Which is an example of biodiversity contributing to the sustainability of an ecosystem?

A
A meadow covers a large area of land, providing shelter to many organisms.
B
The ocean can only support organisms that can survive salty conditions.
C
One species of plant has been growing in a field for several years.
D
Many kinds of fruit trees support a variety of birds and other animals in a forest.
7

What is common between the environmental changes of ice ages and global warming?

A
They influence global temperatures in the same way.
B
They have the same causes.
C
They can lead to extinction.
D
They disrupt the same species in the same ways.
8

organismpopulationecosystemspecies

A
organism
B
population
C
ecosystem
D
species
9

Which is an example of primary succession?

A
an oak growing in an abandoned field
B
ferns growing in a forest
C
a new cactus growing next to an old cactus
D
lichens growing on cooled lava rock
10

The Chesapeake Bay is an important natural resource. Over the years, the number of oysters in the bay has declined dramatically, largely because of fishers who catch them and sell them as food. This has affected many other organisms that depend on oysters.

A
eutrophication
B
non-sustainable harvesting
C
nonnative species introduction
D
pollution
11

Which best defines a pioneer species?

A
a species that enters an area and makes its own food
B
a species that enters a community that is stable and balanced
C
the first species to populate an uninhabited area
D
the first species that eats other organisms in an area
12

Dan drew a diagram to compare the effects of human-induced environmental changes on organisms and species.

Question illustration
A
Impact on growth and development
B
Extinction
C
Change in competition
D
Loss of habitat
13

Which graph best represents the relationship between niche diversity and biodiversity?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
14

Which two human activities are believed to be the greatest contributors to global warming?

A
nonnative species introduction and the burning of fossil fuels
B
deforestation and the burning of fossil fuels
C
deforestation and nonnative species introduction
D
non-sustainable harvesting and nonnative species introduction
15

A large manufacturing company releases chemicals into the air every day. The chemicals eventually make their way into local bodies of water, killing many of the organisms that live in these areas.

A
habitat destruction due to pollution
B
habitat destruction due to poaching
C
pollution due to poaching
D
poaching due to habitat destruction

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