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Chapter 8.2 Review (8th)
Test Description: Eras of the Geologic Time Scale
Instructions: Answer all questions to get your test result.
1) The time from the formation of Earth 4.6 billion years ago to about 543 million years ago. Life on Earth began during this time
A
Precambrian time
B
Paleozoic era
C
Cenozoic era
D
Holocene epoch
2) Organisms that contain a nucleus and other complex structures in their cells. These organisms appeared about 1 billion years ago
A
eukaryotes
B
ozone
C
prokaryotes
D
cyanobacteria
3) A gas in the atmosphere which absorbs harmful radiation from the sun
A
carbon
B
oxygen
C
nitrogen
D
ozone
4) The most recent geologic era, beginning 65 million years ago; also called the Age of Mammals
A
Cenozoic era
B
Mesozoic era
C
Paleozoic era
D
Precambrian time
5) What are the four biggest eras in geologic history?
A
Precambrian, Prehistoric, Mesozoic, and Cenozoic
B
Precambrian, Paleozoic, Mesozoic, and Cenozoic
C
Prehistoric, Paleozoic, Mesozoic, and Modern
D
Prehistoric, Mesozoic, and Cenozoic, and Modern
6) How many cells did the first living things, prokaryotes, have?
A
hundreds
B
one
C
none
D
thousands
7) living things that first made food from sunlight
A
ozone
B
cyanobacteria
C
oxygen
8) gas that cyanobacteria sent into oceans and air
A
cyanobacteria
B
oxygen
C
ozone
9) a layer of gas around the earth that keeps out radiation
A
oxygen
B
cyanobacteria
C
ozone
10) A billion years after Earth formed, what kind of living things appeared?
A
fossil
B
larger, more complex
C
gas
D
smaller, less complex
11) What happened to almost all living things from the Paleozoic era?
A
They came to land.
B
They moved to the oceans.
C
They died out.
D
They were eaten.
12) What are the best-known reptiles of the Mesozoic era?
A
plants
B
dinosaurs
C
salamanders
D
birds
13) Unlike the atmosphere today, the atmosphere 3.5 billion years ago did not contain
A
nitrogen.
B
ozone.
C
carbon dioxide.
D
gases.
14) Before an ozone layer formed and reduced the radiation reaching the Earth’s surface, most life existed
A
in oceans and underground.
B
on land.
C
in trees and plants.
D
in the air.
15) Fossils indicate that some of the first animals to live on land were
A
crawling insects.
B
large salamanders.
C
reptiles.
D
dinosaurs.
*select an answer for all questions
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