Unit Test — Unit test Answers

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Ground squirrels are found in many areas of the United States. They live in underground burrows and are often attacked by birds of prey, coyotes, and bobcats. Which of the following is a limiting factor for a ground squirrel population?

A
a population of tree squirrels
B
a population of hawks
C
genetic variability
D
breeding season
22
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Charles Darwin hypothesized that some individuals would be better equipped for survival than others, and that those that were less equipped would not survive. Darwin formulated this hypothesis based on the work of which scholar?

A
John Gould, who compared mainland and island finches
B
Thomas Malthus, who studied population growth
C
Sir Isaac Newton, who formulated the laws of motion
D
Gregor Mendel, who determined genetic inheritance of traits
23

The burrowing owl is found in dry, open areas such as grasslands, prairies, savannas, deserts, farmlands, golf courses, and urban areas throughout most of western United States and Florida, Central America, and most of South America. It makes its home in burrows of other animals and primarily eats insects and small rodents. As humans build more cities, nearby burrowing owl habitats change due to destruction of burrows and loss of prey. Which is the least likely outcome of the habitat changes that are described?

A
The niche of the burrowing owl may change as it adapts to the changes.
B
The niche of the burrowing owl may change as it moves to a new habitat.
C
The population of the burrowing owl may be reduced or even become extinct.
D
The population of the burrowing owl may increase in its new surroundings.
24

A student has written a paper about a deer population that was separated when a canyon developed between members of the group. In her paper, she showed that the two groups adapted differently and can no longer interbreed. What would be the best title for her paper?

A
Speciation by Geographic Isolation
B
Speciation by Reproductive Isolation
C
How Natural Selection Creates Species
D
How Adaptation Creates Species
25

A trout population grew from 4 in 1992 to 16 in 1993 and then to 64 in 1994. If it continued to grow exponentially, approximately how many trout were there in 1995?

A
100
B
128
C
256
D
320

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