Biodiversity Answers

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1
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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.
2
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Which of the following is not a possible reason for migration?

A
climate changes
B
diminished food supply
C
reproduction patterns
D
increased biodiversity
3

Consider the following food chain: Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes. What would happen to the other members of the food chain if the plant population was wiped out?

A
The populations of grasshoppers, mice, and snakes would increase.
B
The populations of grasshoppers and mice would increase, while the population of snakes would decrease.
C
The populations of grasshoppers would decrease, while the population of mice and snakes would increase.
D
The populations of grasshoppers, mice, and snakes would decrease.
4

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?

A
genetic diversity
B
ecosystem diversity
C
species diversity
D
variation
5

Organisms are dependent on each other for the energy they need to survive. Photos (left to right) by Mehmet Karatay, Jens Buurgaard Nielsen, Furryscaly, and Walter Siegmund What would occur if the snake population is removed from the ecosystem pictured above?

Question illustration
A
the hawk population increases
B
the mouse population increases
C
the leaf population increases
D
the mouse population is not affected
6

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
7

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.
8

Migration causes a temporary appearance of new organisms in an ecosystem, but not a permanent one. Please select the best answer from the choices provided

A
T
B
F
9

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.
10

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.
11

An increase in biodiversity generally causes _______.

A
a decrease in ecosystem stability
B
random fluctuations in ecosystem stability
C
an increase in ecosystem stability
D
no change to ecosystem stability
12

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
13

An increase in the biodiversity of an ecosystem leads to an increase in its productivity.

A
T
B
F
14

The water hyacinth is an invasive species that can spread extremely fast, blanketing a water surface in a very short period of time. It can limit boat traffic, swimming, and fishing, and it can deprive native plants and animals of sunlight and oxygen, thus reducing the local biodiversity. This situation demonstrates _______.

A
how migratory patterns change in response to alterations in an ecosystem
B
the effects of symbiosis
C
the effects of local evolution or migration on an ecosystem
D
how changes in biodiversity impact an ecosystem
15

Consider the following food chain: Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes. In the short term, what will happen to the other members of the food chain if the mice were removed?

A
the number of plants will decrease, the number of grasshoppers will increase, the number of snakes will decrease
B
the number of plants will decrease, the number of grasshoppers will decrease, the number of snakes will decrease
C
the number of plants will increase, the number of grasshoppers will increase, the number of snakes will decrease
D
the number of plants will increase, the number of grasshoppers will increase, the number of snakes will increase

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