Why is biodiversity valuable in the biosphere?

it is the biological life-support system of our planet

Why is ozone important?

it absorbs harmful UV radiation

Which of the following is NOT a goal of conservation biology?

introducing foreign species to new environments

Which is a way to limit deforestation?

plant and harvest trees on tree farms

For what are early hunters and gatherers in North America responsible?

a major extinction event of large animals

What is NOT true about the practice of monoculture?

it is a sustainable farming practice

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Chapter 6

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Questions 17

Answers

1
Which of the following is NOT a threat to biodiversity?
invasive species
biological magnification of toxic compounds
species preservation
habitat fragmentation
2
Why is biodiversity valuable in the biosphere?
it provides humans with resistance to disease
it is the biological life-support system of our planet
it tells us about many other species
it gives us interesting things to look at
3
Which is a property of DDT that makes it hazardous over time?
it is an insecticide
it is deadly to herbivores
it is a perfect pesticide
it is nonbiodegradable
4
The number of different species in the biosphere is called
biodiversity
species diversity
ecosystem diversity
genetic diversity
5
Why is ozone important?
it removes carbon dioxide from the atmosphere
it helps with the water cycle
it reduces smog
it absorbs harmful UV radiation
6
What is a major cause of ozone depletion?
sulfuric acid
ultraviolet light
nitric acid
chlorofluorocarbons
7
What happens as DDT moves up the trophic levels in food chains?
its concentration stays the same
its concentration increases
its concentration is eliminated
its concentration decreases
8
Protecting ecosystem diversity is a goal of
the green revolution
the World Health Organization
the United Nations
conservation biology
9
Which of the following is NOT a goal of conservation biology?
wise management of natural resources
introducing foreign species to new environments
protection and management of individual species
preservation of habitats and wildlife
10
How can you describe an old-growth forest?
poor in biodiversity
a renewable resource
a microclimate
a nonrenewable resource
11
Which is a way to limit deforestation?
increase carbon dioxide levels
use more wood products
fertilize the soil
plant and harvest trees on tree farms
12
How can farmers reduce soil erosion?
contour plowing
graze cattle on the land
plow up roots
increase irrigation
13
For what are early hunters and gatherers in North America responsible?
natural plant and animal populations
inventing technology such as manufactured tools
a major extinction event of large animals
producing new crop varieties
14
What is NOT true about the practice of monoculture?
it often involves the use of chemical fertilizers
it is a sustainable farming practice
it was a strategy of the Green Revolution
it is a large field planted with the same crop each year
15
When sulfur and nitrogen compounds in smog combine with water they form
chlorofluorocarbons
acid rain
ozone
ammonia
16
What can overexposure to UV radiation cause?
it can decrease organisms' resistance to disease
all of the above
it can cause cancer
it can damage eyes
17
Some scientists think that global warming is
a natural variation in climate
melting polar ice caps
a result of human activity
all of the above

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