AnswersEF Environmental Science 1st Nine WeeksEcology 102

Population Genetics Answers

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1
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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
2
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R-selected species have a short life span and an early reproduction cycle.

A
T
B
F
3

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
4

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.
5

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.
6

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

A
Redwood trees
B
Fruit flies
C
Algae
D
Grasshoppers
7

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
8

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
9

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
10

A high birth to death ratio leads to smaller populations.

A
T
B
F
11

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
12

When two species compete for the same ecological niche, they cannot coexist because they are competing for the exact same resources. One species is always slightly better adapted for the niche than the other, so over time the disadvantaged species will either go extinct or shift to a different ecological niche. This situation highlights the concept of _______.

A
carrying capacity
B
competitive exclusion
C
limiting factor
D
biotic factor
13

Identify the biotic limiting factor from the choices below.

A
space
B
vegetation
C
water
D
climate
14

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

A
T
B
F
15

Migration is _______.

A
the movement of organisms from a native location to a foreign location
B
the movement of organisms from a foreign location to a native location
C
the movement of organisms from their water supply to their food supply
D
the seasonal movement of organisms between locations
16

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.
17

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
18

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.

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