Focus On Life Science: California Grade 7

Chapter 8: The History of Life on Earth

Standards Review

1.
Which is NOT a characteristic of an organism whose remains are index fossils? 4.g
A)The organism must have lived over a wide geographic range.
B)The organism must have lived for a long time before becoming extinct.
C)The organism must have hard parts that are easy to preserve in rocks.
D)The organism must have lived in many types of environments.
2.
Fossils are mainly preserved in ________. 4.g
A)rock
B)coral formations
C)glaciers
D)crystallized magma
3.
What is the name of the geologic time period in which we live? 4.g
A)Cambrian
B)Jurassic
C)Quartenary
D)Devonian
4.
Which is NOT a common explanation for mass extinctions? 4.b
A)asteroid impact
B)volcanic activity
C)changes in Earth's orbit around the Sun
D)climate change
5.
Which is NOT a possible outcome of global warming? 4.b
A)lower sea levels
B)decreased levels of oxygen in ocean water
C)mass extinctions
D)melting glaciers
6.
Which describes cyanobacteria? 4.g
A)They take in oxygen and release carbon dioxide.
B)They are one of the earliest organisms.
C)They became extinct several million years ago.
D)They are a multiple-celled plant that carries out photosynthesis.
7.
How does ozone in the upper atmosphere help protect life on Earth? 4.g
A)by causing meteors to burn up before hitting the surface of the Earth
B)by making oxygen for organisms to breath
C)by absorbing the gasses and dust put into the atmosphere by volcanoes
D)by shielding the Earth's surface from harmful radiation from the Sun
8.
Which is a characteristic of an amniote? 4.g
A)It lays its eggs on land.
B)It evolved from reptiles and dinosaurs.
C)It is an ancestor of the first amphibians.
D)It was the first vertebrate organism.
9.
Where did the first plants develop? 4.g
A)in the ocean
B)on the land
C)in swamps
D)in forests
10.
Which is true of dinosaurs? 4.d
A)They were ectotherms.
B)They lived only on land, not in the water.
C)They evolved during the same geologic period as mammals.
D)They evolved from birds.
11.
Which describes the general trend of organisms over geologic time scales? 4.g
A)They become less diverse over time.
B)They do not change over time.
C)They become more complex over time.
D)They learn to breed with other species over time.
12.
How are gymnosperms and angiosperms different? 4.g
A)Gymnosperms produce flowers, but not seeds. Angiosperms produce seeds, but not flowers.
B)Gymnosperms are now all extinct, but angiosperms are still on living today.
C)Gymnosperms live in the ocean, but angiosperms live on land.
D)Gymnosperms produce seeds, but not flowers. Angiosperms produce seeds and flowers.
13.
Which organisms from the Cambrian period made the first reefs? 4.g
A)corals
B)sponges
C)cyanobacteria
D)trilobites
14.
In which period did mammals evolve? 4.g
A)Jurassic Period
B)Mississippian Period
C)Triassic Period
D)Ordovician Period
15.
Of the two, which is more likely to be the cause of mass extinctions? 4.e, 4.g
A)physical changes
B)biological changes
Grade 7
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