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An increase in the biodiversity of an ecosystem leads to an increase in its productivity.
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TRUE.
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How can an increase in biodiversity lead to an increase in ecosystem stability?
a.
A more biodiverse ecosystem is not subject to change.
b.
A more biodiverse ecosystem has a higher chance of adapting to species changes.
c.
A more biodiverse ecosystem has fewer species types to balance.
d.
A more biodiverse ecosystem is subject to fewer natural disasters.
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B.
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Ecosystems with greater biodiversity have an increased stability.
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TRUE.
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Migration is always temporary.
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FALSE.
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Consider the following food chain:
Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes.
What will happen to snakes in the long term if mice become extinct?
a.
The number of snakes will increase temporarily, and then decrease.
b.
The number of snakes will decrease permanently, but they will not die out completely.
c.
The number of snakes will decrease temporarily and then increase.
d.
Snakes will die out if they do not find an alternative food source.
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D.
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When the comb jelly, Mnemiopsis leidyi, was introduced into the Black Sea, its population exploded to 500 comb jellies per cubic yard in 1988. The jellies devoured all the zooplankton and fish larvae, drastically reducing the numbers of the native fish populations. This situation demonstrates _______.
a.
the difference between biotic and abiotic factors in an ecosystem.
b.
effects of local evolution or migration on an ecosystem.
c.
the impact of removing or adding organisms to an ecosystem.
d.
the types of interactions between organisms in an ecosystem.
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NOT B.
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Consider the following food chain:
Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes.
What will happen to the other members of the food chain if the grasshoppers are removed?
a.
the number of plants will increase, the number of mice will decrease, the number of snakes will decrease
b.
the number of plants will decrease, the number of mice will increase, the number of snakes will increase
c.
the number of plants will decrease, the number of mice will increase, the number of snakes will decrease
d.
the number of plants will increase, the number of mice will increase, the number of snakes will increase
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A.
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A variety of different mechanisms in nature help create diversity in organism populations. The tundra found in the northernmost parts of the planet is the world’s youngest biome. The tundra is home to a variety of plants and animals. Organisms that can be found in the tundra include shrubs, mosses, caribou, polar bears, and wolves. Which mechanism do the different organism populations found across the tundra exemplify?
genetic diversity
ecosystem diversity
species diversity
variation
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NOT A.
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What is a possible cause for a decrease in ecosystem productivity?
a.
an increase in the biodiversity of the ecosystem
b.
a decrease of the biodiversity of an ecosystem
c.
the biodiversity of an ecosystem experiencing no change
d.
an ecosystem becoming more stable
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…
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Consider the following food chain:
Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes.
What is likely to happen if a new organism that feeds off mice is introduced?
a.
The mice population will increase in response to the arrival of the new organism.
b.
The mice population, grasshopper population, and plant population will all increase.
c.
The new organism will compete with the snake population for resources.
d.
The populations of the existing organisms will remain unaffected.
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…
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