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Science
Grade 07
TCS Life Science Unit 5 Test
Tift/ESMS/Life Science
TCS Life Science
Unit 5:
Evolution
Science
Grade 07
Student Name: DO NOT WRITE ON THIS TEST
Revised January 2014
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Science
Grade 07
TCS Life Science Unit 5 Test
Question
1.
The mechanism that Darwin used to explain evolution is
2.
A. over production.
B. competition.
C. variation.
D. natural selection.
Remains of an organism which have been changed to rock are called
3.
A. imprints.
B. footprints.
C. molds.
D. petrified fossils.
Fossils provide evidence of Earth’s past
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A. climate.
B. environment.
C. life forms.
D. climate, environment, and life forms.
4.
Fossils are usually found in
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A. caves.
B. sedimentary rock.
C. sand.
D. water.
5.
The most obvious difference in Darwin’s finches was the variation in
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A. wingspan
B. beak size and shape.
C. eye color.
D. size.
6.
The manatee is an herbivore that lives its entire life in the water. Although they look like
whales, manatees are actually closely related to elephants, and are descended from fourlegged land animals. According to Darwin’s theory of evolution, the loss of the manatee’s
hind limbs most likely
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A. occurred suddenly.
B. is the result of a single point mutation.
C. happened to make the manatee swim better in the water
D. happened over many generations as the manatee’s ancestors moved to the water.
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Science
Grade 07
TCS Life Science Unit 5 Test
7.
Horseshoe crabs, or Limulus polyphemus, are very common along the east coast of the United
States. Fossil horseshoe crabs have revealed that they have changed very little in the past 300
million years. Which statement best explains why this is the case?
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A. Horseshoe crabs have a low reproductive rate.
B. Horseshoe crabs need to change only if humans are present in their environment.
C. Horseshoe crabs have a high mutation rate.
D. The horseshoe crab is well adapted to its environment, and its environment has not
changed much in the last 300 million years.
8.
Which of the following is not a factor that affects the process of evolution by natural
selection?
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A. overproduction
B. variation of phenotype
C. environmental change
D. inheritance of acquired characteristics
9.
Darwin’s observation of giant fossil sloths led him to believe that
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A. these fossil organisms are related to the sloths alive today.
B. the giant sloths must still be alive somewhere.
C. the giant sloths are not related to any sloth alive today.
D. the giant sloths were killed off by present-day sloths.
10.
11.
How did Darwin explain the similarities between organisms in South America and the
Galapagos islands?
A. He suggested that identical organisms were in both places.
B. He suggested that a small number of organisms broke off of the island and
populated South America and evolved.
C. He suggested that a few organisms came to the islands from the mainland and
evolved.
D. He suggested that all of the organisms originated in North America.
Darwin’s theory of evolution by natural selection explains all of the following except
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A. the fossil record.
B. the origin of life on Earth.
C. the diversity of living things.
D. the characteristics of organisms Darwin saw on the Galapagos Islands.
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Science
Grade 07
TCS Life Science Unit 5 Test
12.
Which question about the finches does the diagram answer?
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A. Are ground finches better adapted for survival than tree finches?
B. Are large beaks favored over small beaks?
C. Are different beak shapes associated with certain types of food?
D. Will more beak shapes evolve in the future?
13.
The species shown have similar bone structures. This is an example of which kind of
adaptation?
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A. vestigial
B. chemical
C. structural
D. behavioral
14.
The fossil record shows that fossils occur in a particular order. What does this order tell us
about life on Earth?
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A. Life forms have changed over time.
B. Life forms have become simpler over time.
C. Life forms have become less diverse over time.
D. Life forms represented by fossils are extinct.
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Science
Grade 07
TCS Life Science Unit 5 Test
15.
Evolution is often represented as a branching tree similar to the one shown above. The names
shown represent different groups of organisms alive today; the lines represent their
evolutionary histories. Which statement is best supported by the diagram?
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A. Annelida and Arthropoda have an ancestor in common.
B. Echinodermata are more closely related to Mollusca than they are to Chordata.
C. Mollusca and Arthropoda probably evolved before Porifera.
D. Annelida and Arthropoda evolved from Echinodermata.
16.
A branching tree shows
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A. how different groups of organisms are related.
B. where different fossils of organisms can be found.
C. how embryos of different organisms develop.
D. which DNA bases are found in different organisms.
17.
Which of the following is NOT a way in which scientists determine evolutionary relationships S7L5a/
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among species?
A. similarities in DNA
B. similarities in body structure
C. similarities in early development
D. similarities in diet
18.
Scientists have found several major mass extinctions in the fossil record. What does a
mass extinction look like in the fossil record?
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A. Many new kinds of fossils suddenly appear in the fossil record.
B. No fossils can be found during these layers in the fossil record.
C. Many kinds of fossils suddenly stop appearing in the fossil record.
D. There is a large gap in the fossil record caused by an unconformity.
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Science
Grade 07
TCS Life Science Unit 5 Test
19.
20.
Which of these organisms does the fossil record indicate lived during the Paleozoic Era?
A.
B.
C.
D.
In his observations of the finches in the Galapagos Islands, Darwin stated that we could never
"watch" natural selection in action. Why did Darwin believe this?
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A. Natural selection happens so quickly, it is difficult to see.
B. Natural selection is an internal process that cannot be outwardly observed.
C. Natural selection occurs over so many generations, it is impossible to see changes
occur.
D. Natural selection is a process that occurs randomly, and it is unlikely that a human
would be present when it occurs.
21.
Which part of an organism is most likely to become a fossil?
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A. bones
B. skin
C. sense organs
D. internal organs
22.
Which of the following is a fossil that preserves the remains of an organism with little or no
change?
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A. a piece of petrified wood
B. a cast of a clam shell in sandstone
C. a carbon film imprint of a leaf
D. a frozen mammoth
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Science
Grade 07
TCS Life Science Unit 5 Test
23.
A fossil that forms when hardened minerals replace all or part of an organism is called a(n)
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A. petrified fossil.
B. carbon film fossil.
C. mold.
D. trace fossil.
24.
Geologists classified organisms in the fossil record and arranged them in order from
earliest to latest. The geologists found evidence that
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A. most present-day organisms have existed without change for billions of years.
B. there are fewer kinds of organisms today than there were in the past.
C. organisms have evolved, or changed over time.
D. few organisms have become extinct during the Cenozoic Era.
25.
Animal fossils are more plentiful than plant fossils because animals contain
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A. hard parts such as bones, teeth, and shells.
B. soft parts such as flesh and hair.
C. large amounts of water.
D. small amounts of chemicals.
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Science
Grade 07
TCS Life Science Unit 5 Test
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