AnswersEnvironmental Science APopulation Size

Population Size Answers

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1
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A population’s distribution can be even, clumped, or random.

A
T
B
F
2
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Identify the biotic limiting factor from the choices below.

A
space
B
vegetation
C
water
D
climate
3

Which of the following statements is true?

A
Biotic factors are nonliving components of an ecosystem.
B
Abiotic factors are living components of an ecosystem.
C
The available space in an ecosystem is an abiotic limiting factor.
D
The available water supply in an ecosystem is a biotic limiting factor.
4

Which of the following factors would have the least effect on the carrying capacity of an ecosystem?

A
the total number of organisms
B
the available water supply
C
the available food supply
D
competitive exclusion
5

Lions live in groups called prides. Lion populations would most likely fall in which category of population distribution?

A
even
B
random
C
clumped
D
density
6

Which of the following factors would have the smallest impact on a population’s size?

A
the total number of organisms
B
the available water supply
C
the variety of organisms
D
adequate shelter
7

Which of the following statements about population distribution is not true?

A
Population distribution can be even, clumped, or random.
B
Population distribution applies only to animals.
C
A population distribution shows where organisms are located.
D
A population distribution shows the arrangement of organisms in a location.
8

How does population density differ from population size?

A
Population size takes all organisms into account, while population density only takes specific age groups of the population into account.
B
Population size is the total number of organisms, while population density is the total number of organisms within a given area.
C
Population size is the total number of organisms within a given area, while population density is the total number of organisms of a specific age.
D
Population size is the total number of organisms of all species, while population density is the total number of organisms of a specific species.
9

R-selected species have a short life span and an early reproduction cycle.

A
T
B
F
10

Which of the following species is a K-selected species?

A
Redwood trees
B
Fruit flies
C
Algae
D
Grasshoppers
11

Which of the following is an example of an even population distribution?

A
corn planted in a field
B
flocks of birds
C
people in a park
D
deer in a forest
12

Which of the following factors would have the least effect on the carrying capacity of an ecosystem?

A
the total number of organisms
B
the available water supply
C
the available food supply
D
competitive exclusion
13

When population growth increases in an area, what is happening to the birth rate and age structure of that population?

A
increasing birth rate with a greater number of young organisms
B
increasing birth rate with a smaller number of old organisms
C
increasing birth rate with a smaller number of young organisms
D
increasing birth rate with a greater number of old organisms
14

Which of the following is not a factor in determining population size?

A
the food supply
B
birth rate
C
available niches
D
detritivore activity
15

Which of the following statements about tolerance range is true?

A
Tolerance range is different for different organisms.
B
The tolerance range is the total number of organisms that can be supported by an ecosystem.
C
Tolerance range is affected by biotic factors in an ecosystem.
D
The available water supply does not impact an organism’s tolerance range.
16

Lions live in groups called prides. Lion populations would most likely fall in which category of population distribution?

A
even
B
random
C
clumped
D
density
17

Identify the biotic limiting factor from the choices below.

A
space
B
vegetation
C
water
D
climate
18

In a particular environment there is plenty of food, water, cover, and space to support a large population of pheasants, but a larger quantity of predators are introduced. The predators become the _______ for pheasants in that environment.

A
carrying capacity
B
abiotic factor
C
limiting factor
D
biotic factor
19

A high birth to death ratio leads to smaller populations.

A
T
B
F
20

Which of the following factors would have the smallest impact on a population’s size?

A
the total number of organisms
B
the available water supply
C
the variety of organisms
D
adequate shelter

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