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Name
Class
Date
7.2 Extinction and Biodiversity Loss
Biodiversity at Risk
1. Is extinction a natural process? Explain.
2. Compare and contrast extinction with extirpation.
8. What human activities lead to habitat loss?
9. What are “habitat islands,” and how do they occur?
10.
How did studies of oceanic islands help scientists understand the effect of habitat
fragmentation on species diversity?
11.
What is the greatest cause of biodiversity loss today?
12.
What factors determine whether nonnative species are considered invasive?
13.
List two nonnative species—one that is invasive, and another that is not invasive.
14. Many protected animals are lost to poaching. What is a main motivation behind poaching?
15. How do warming temperatures affect animals that live in cold climates?
Name
Class
Date
7.3 Protecting Biodiversity
1. Complete the following paragraph with terms from the word bank.
biodiversity treaty
CITES
DDT
In the United States, the main
Endangered Species .Act
law
treaties
that protects biodiversity is the
. In effect since 1973, it has helped with the recovery of a number
of species including the bald eagle and other birds that were at risk of extinction due to
effects of the pesticide
protect biodiversity on an international level.
. Several
help to
, for example, has
been in effect since 1975 and bans the international transport of endangered species.
The Convention on Biological Diversity, sometimes commonly referred to as the
, has the commitment of about 200 nations. Although it has been
signed by the United States, it has not yet been ratified.
For Questions 2-6, circle the letter of the correct answer.
2. Tigers living in warm climates have thinner coats of fur than tigers living in cool climates. This is
a result of
a.
genetic diversity.
b.
species diversity.
c.
ecosystem diversity.
d.
general diversity.
3. The Sikhote-Alin Mountains, and the Siberian tigers living on them, are separated from other
mountain regions in which the tigers could live. The mountains are an example of a(n)
a.
mass extirpation.
b.
invasive species.
c.
mass extinction.
d.
habitat fragment.
4. The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES)
and the Convention on Biological Diversity are examples of
a.
organizations that promote poaching.
b.
polls measuring American opinion about biodiversity.
c.
treaties to protect biodiversity.
d.
laws to increase the number of species.
5. Relieving a nation from repaying some of the money it owes other nations in exchange for
protecting its biodiversity is called a
a.
debt-for-nature swap.
b.
conservation concession.
c.
Species Survival Plan.
d.
wildlife corridor.
6. There is a plan to establish an 8000-kilometer-long strip of land across eight southeast Asian
countries to rejoin fragments of tiger habitat. This is an example of a
a.
wildlife corridor.
b.
worldwide biodiversity treaty.
c.
captive breeding program.
d.
conservation concession.