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Unit 7
Test Description: 7th grade unit 7 review
Instructions: Answer all questions to get your test result.
1) What type of succession happens where there is only bare rock?
A
Secondary Succession
B
Primary Succession
C
Tertiary Succession
2) If your local area became a desert, what would happen to the organisms that live there?
A
Everything would become extinct and barren.
B
The current organisms would increase.
C
Nothing. They would not be affected.
D
Different organisms would move in and be supported.
3) What would happen if you left a garden alone for a couple of months?
A
It would look the exact same.
B
Small weeds and grass would be sprouting.
C
Mature trees would be present with new organisms.
4) The more diverse an ecosystem-
A
the fewer varieties of species are present.
B
the species are all alike.
C
the more stable it is.
D
the less stable it is.
5) How does biodiversity contribute to the sustainability of an ecosystem?
A
Low biodiversity reduces the competition for resources, which helps native species survive.
B
A variety of plant and animal species allows for more survivors of a natural disaster.
C
Fewer species in the ecosystem reduces the likelihood that disease spreads through the ecosystem
D
Having more species in an ecosystem allows the human population to increase in size.
6) A forest fire would start the process of ________
A
Primary Succession
B
Tertiary Succession
C
Secondary Succession
7) What is the role of pioneer species?
A
They help create soil by helping to break down rock and adding organic matter.
B
They only live where there is already soil.
C
They do not have a different purpose.
D
They test out the environment for other species.
8) Pioneer species must be able to......
A
carry out photosynthesis
B
run very fast
C
migrate during the winter
D
hide from predators
9) What is the relationship between ecological succession and equilibrium in an ecosystem?
A
There is no relationship between ecological succession and equilibrium.
B
Ecological succession prevents ecosystems from ever reaching equilibrium.
C
Ecological succession and equilibrium are the same thing.
D
Ecological succession leads to equilibrium in an ecosystem.
10) When observing succession in an abandoned field, what would you see first?
A
Growth of shrubs and trees
B
Formation of topsoil.
C
Growth of grasses and weeds.
D
A mature grassland community
11) A field with 10 different types of crops will be more sustainable than a field with only 2 types of crops. This is due to:
A
biodiversity
B
succession
C
magic
D
erosion
12) What is ecological succession?
A
process of creating soil only
B
Rebuilding a community only after fires
C
process of building farmland
D
process of change in the species and structure of an ecological community
13) In both primary and secondary succession, the vegetation will go from smaller to larger.
A
False
B
True
14) Which ecosystem would most likely have the lowest biodiversity and population sizes 3 years later?
A
A river floods a cornfield.
B
Clearing land for a highway.
C
Lava erupts to create a new section of land.
D
Forest fire destroys plant growth
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