Biodiversity Answers

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.

4

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.

5

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

A

T

B

F

6

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

7

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.

8

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

9

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.

10

Macroevolution occurs within a population.

A

T

B

F

11

A mutation that causes resistance in a population of beetles is an example of _______.

A

macroevolution

B

microevolution

C

migration

D

reproduction

12

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

13

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

A

T

B

F

14

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.

15

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.

16

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

17

Which of the following statements about migration is true?

A

Migration is always from one region to another.

B

Animals always migrate within a region.

C

Migration always negatively impacts an ecosystem.

D

Animals migrate for various reasons.

18

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?

A

the hawk population increases

B

the mouse population increases

C

the leaf population increases

D

the mouse population is not affected

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