Focus On Life Science: California Grade 7

Lesson 2: Adaptation and Extinction

Standards Check

1.
The thick skin of a cactus helps prevent water loss in the dry desert. This is an example of _________ 3.a
A)camouflage
B)structural adaptation
C)mimicry
D)behavioral adaptation
2.
An insect on a branch looks like a small stick. This is an example of _______ 3.a
A)camouflage
B)mimicry
C)structural adaptation
D)behavioral adaptation
3.
Some birds fly to warmer climates when it gets cold. This is an example of _______ 3.a
A)structural adaptation
B)behavioral adaptation
C)mimicry
D)camouflage
4.
When the last individual of a species dies, __________ occurs. 3.e
A)selective breeding
B)natural selection
C)mutation
D)extinction
5.
According to the theory of natural selection, organisms that are better adapted to an environment __________ than organisms that are not. 3.b
A)are stronger
B)grow larger
C)run faster
D)survive and reproduce at a greater rate
6.
The many species of finches and tortoises Darwin observed on the Galapagos Islands are an example of __________. 3.b
A)extinction
B)selective breeding
C)adaptive radiation
D)phenotype variability
7.
Which of the following is an example of Darwin's theory of evolution by natural selection? 3.b
A)Giraffes that stretch their necks have necks that grow longer.
B)Insects that blend into trees survive because they are not seen, and thus not eaten, by birds.
C)A breeder of cats specifically chooses cats to breed that have long, white fur.
D)Native Americans do not kill an albino animal because it is thought to be bad luck.
8.
A species that once was present on Earth but has died out is a(n) __________ species. 3.e
A)extinct
B)stable
C)endangered
D)threatened
9.
Unlike the extinction of dinosaurs, many extinctions that have taken place in the past 20 years probably have been caused by __________. 3.e
A)dust and ash
B)meteorites
C)volcanoes
D)human activities
10.
A mouse population develops an adaptation that results in white fur. They live in a forest with a population of hawks. Which of these statements is true? 3.a
A)The population of white mice will most likely increase.
B)The population of white mice will most likely stay the same.
C)The population of white mice will most likely decrease.
D)The population of hawks will most likely decrease.
Grade 7
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