Florida Science Grade 7

Section 1: Biodiversity

Biodiversity

1
Because a forest has more species than a wheat field, the forest is said to have a higher __________.
A)ecosystem
B)ozone layer
C)extinction rate
D)biodiversity
2
Why would you expect biodiversity to be greater in Mexico than in Canada?
A)Mexico is closer to the equator.
B)Canada is too wet.
C)Mexico has less pollution.
D)Canadians don't like animals.
3
How have people used biodiversity to help improve food crops?
A)weaving fibers from plants into clothing
B)treating disease with medicines from plants
C)crossbreeding crop plants with wild plants
D)using building materials from plants
4
Although most medicines now are made in factories, many originally came from __________.
A)mammals
B)Mexico
C)wild plants
D)Canada
5
Which one of the following ecosystems would you predict to be the most stable?
A)a tropical rain forest
B)a wheat field
C)a vineyard of grapevines
D)a pond full of catfish
6
A species that once was present on Earth but has died out is a(n) __________ species.
A)stable
B)extinct
C)endangered
D)threatened
7
Unlike the extinction of dinosaurs, many extinctions that have taken place in the past 20 years probably have been caused by __________.
A)meteorites
B)volcanoes
C)dust and ash
D)human activities
8
Why is it important to identify endangered species?
A)to help poachers find them
B)so they can be used for food
C)to help prevent extinctions
D)so they do not kill humans
9
Which one of the following is a threatened species?
A)black rhinoceros
B)dinosaur
C)house cat
D)Australian koala
10
The Lake Erie water snake is classified as a threatened species because of __________.
A)habitat loss
B)introduced species
C)acid rain
D)global warming
11
Which one of the following would you expect to have reduced biodiversity?
A)large habitats
B)stable ecosystems
C)divided habitats
D)unpolluted ecosystems
12
A(n) __________ is a species that moves into an ecosystem as a result of human actions.
A)endangered species
B)extinct species
C)introduced species
D)native species
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