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Skills Worksheet
Active Reading
Section: What Is Biodiversity?
Read the passage below and answer the questions that follow.
Humans benefit from biodiversity every time they eat. Most of the crops
produced around the world originated from a few areas of high biodiversity.
Most new crop varieties are hybrids, crops developed by combining genetic
material from other populations. History has shown that depending on too
few plants for food is risky. For example, famines have resulted when an
important crop was wiped out by disease. But some crops have been saved
from diseases by being crossbred with wild plant relatives. In the future,
new crop varieties may come from species not yet discovered.
IDENTIFYING MAIN IDEAS
One reading skill is the ability to identify the main idea of a passage. The main
idea is the main focus or key idea. Frequently, a main idea is accompanied by
supporting information that offers detailed facts about main ideas.
In the space provided, write the letter of the term or phrase that best completes
each statement.
_____ 1. Depending on a few plants for food is
a. healthy for humans.
b. risky for humans.
c. good for crops.
d. beneficial for some species.
_____ 2. Relying on one important crop can cause
a. famine if the crop is wiped out.
b. hybrids if the crop mixes with another population.
c. disease if the crop came from wild plants.
d. a new crop variety if a new species is introduced.
_____ 3. Some types of crops can be saved from disease if
a. they can be genetically isolated.
b. they are sprayed with enough pesticide.
c. areas of high biodiversity are destroyed.
d. they are crossbred with their wild plant relatives.
Read the question and write the answer in the space provided.
4. What is the main idea of this passage?
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Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Biodiversity
Name ______________________________ Class __________________ Date __________________
Active Reading continued
VOCABULARY DEVELOPMENT
Read each question and write the answer in the space provided.
5. What key term is in this passage?
_______________________________________________________________
6. What is a hybrid crop?
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RECOGNIZING SIMILARITIES AND DIFFERENCES
One reading skill is the ability to recognize similarities and differences between
two phrases, ideas, or things. This is sometimes known as comparing and
contrasting.
Read the question and write the answer in the space provided.
7. How is a hybrid different from its originating crops?
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RECOGNIZING CAUSE AND EFFECT
One reading skill is the ability to recognize cause and effect.
Read each question and write the answer in the space provided.
8. The crops we enjoy today originated from.
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9. A hybrid crop is developed by.
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10. Explain one reason why a famine might occur.
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11. How can crossbreeding help save a type of crop plant?
_______________________________________________________________
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Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Environmental Science
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Biodiversity
TEACHER RESOURCE
probably no way to know beforehand
whether one or more wolf populations will
begin preying on livestock. (Note: Studies
have shown that there is little evidence to
support the claim that wolves are responsible
for killing large numbers of livestock.)
17. No; we do not fully understand what effects
we are having on the environment when we
eliminate a species from an ecosystem.
However, we have seen many cases where
the results have been negative. Such
tampering has been at least partly responsible
for the losses of additional populations and
species that have occurred over the last
several centuries.
8. Both contain biodiversity; both serve
important purposes but are being threatened
by human activity.
9. developments along waterways, over-fishing,
and pollution10. They aren’t well studied and
aren’t as well protected by laws.
11. travel routes for migrating species and links
to ecosystems on land
12. Answers may vary. Students might list any of
the following: Services provided by coral
reefs are worth an estimated $375 billion per
year; the reefs provide food, tourism revenue,
coastal protection, and sources of new
chemicals; it is important to protect areas of
vast biodiversity.
Active Reading
SECTION: THE FUTURE OF
BIODIVERSITY
SECTION: WHAT IS BIODIVERSITY?
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
b
a
d
Answers may vary; for example: Biodiversity
is critical to world food supplies.
biodiversity
a crop developed by combining genetic
materials from other populations
It has been crossbred with other plant
populations.
a few areas of high biodiversity
combining genetic material from other
populations
If humans rely on one crop and that crop
becomes diseased, the entire crop could be
wiped out and there would not be enough
food.
If the crop is diseased and the plants are
crossbred with their wild plant relatives, the
resulting hybrid may be more resistant to
disease.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
b
d
a
983
the federal government
The federal government is not allowed to
carry out any project that might harm a listed
species.
everyone
d
a
compile a list of all endangered and
threatened species in the United States
a fine
The second provision is violated if people
harm, buy, or sell any part of an endangered
species.
Map Skills
1. fork-marked lemur; golden-brown mouse
lemur
2. endangered
3. golden bamboo lemur; fork-marked lemur
4. Answers may vary. Students should indicate
an understanding of the fact that the map
shows distribution of the population, not the
population itself. So, although the golden
bamboo lemur does not have the smallest
distribution, it may have the smallest overall
population.
SECTION: BIODIVERSITY AT RISK
1.
2.
3.
4.
5.
6.
a small fraction
60 percent
the majority of it
$375 billion per year
terrestrial areas
Coral reefs are a source of food, money from
tourism, coastal protection, and new
chemicals.
7. swamps, marshes, shores, and kelp beds
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Environmental Science
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Biodiversity