Unit 7 Question Preview (ID: 41718)
7th Grade Unit 7 Review.
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What type of succession happens where there is only bare rock?
a) Primary Succession
b) Secondary Succession
c) Tertiary Succession
d)
If your local area became a desert, what would happen to the organisms that live there?
a) Nothing. They would not be affected.
b) Everything would become extinct and barren.
c) Different organisms would move in and be supported.
d) The current organisms would increase.
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.
d)
The more diverse an ecosystem-
a) the less stable it is.
b) the more stable it is.
c) the fewer varieties of species are present.
d) the species are all alike.
How does biodiversity contribute to the sustainability of an ecosystem?
a) Fewer species in the ecosystem reduces the likelihood that disease spreads through the ecosystem
b) Low biodiversity reduces the competition for resources, which helps native species survive.
c) Having more species in an ecosystem allows the human population to increase in size.
d) A variety of plant and animal species allows for more survivors of a natural disaster.
A forest fire would start the process of ________
a) Primary Succession
b) Secondary Succession
c) Tertiary Succession
d)
What is the role of pioneer species?
a) They test out the environment for other species.
b) They do not have a different purpose.
c) They only live where there is already soil.
d) They help create soil by helping to break down rock and adding organic matter.
Pioneer species must be able to......
a) hide from predators
b) carry out photosynthesis
c) run very fast
d) migrate during the winter
What is the relationship between ecological succession and equilibrium in an ecosystem?
a) Ecological succession leads to equilibrium in an ecosystem.
b) Ecological succession prevents ecosystems from ever reaching equilibrium.
c) There is no relationship between ecological succession and equilibrium.
d) Ecological succession and equilibrium are the same thing.
When observing succession in an abandoned field, what would you see first?
a) Growth of shrubs and trees
b) Formation of topsoil.
c) A mature grassland community
d) Growth of grasses and weeds.
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
What is ecological succession?
a) Rebuilding a community only after fires
b) process of creating soil only
c) process of change in the species and structure of an ecological community
d) process of building farmland
In both primary and secondary succession, the vegetation will go from smaller to larger.
a) True
b) False
c)
d)
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) Forest fire destroys plant growth
d) Lava erupts to create a new section of land.
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