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Study Guide Answers

1.     Who accompanied most exploring expeditions of the Nineteenth Century?
     scientists
2.     What North American animal was facing extinction at the end of the last century?
     bison (or buffalo)
3.     Why is the total number of living species only an approximation?
     Tropical areas haven't been studied.
4.     What are the most abundant and diversified forms of life on the planet?
     the insects
5.     How many known species of insects are there in the world?
     990,000
6.     What is one estimate for the total number of insect species?
     30 million
7.     The tropics, with six percent of the world's land surface, contain what percentage of insect species?
     90%
8.     Which kind of natural community is more stable--simple or diverse?
     diverse
9.     Would a cornfield be considered a simple or diverse natural community?
     simple
10.     Genetic diversity is aesthetically pleasing, but scientists can always recreate genetic material if a species becomes extinct. True or false?
     false
11.     Shaking pollen from one variety of a species onto another variety is called what?
     cross-pollination
12.     One-half of all prescription drugs are derived from plants and animals. True or false?
     true
13.     Without man's interference, about how often do species become extinct?
     1 every 1,000 years
14.     What is the rate of species extinction today?
     10 per day
15.     What does it mean to say that a species is endemic to a region?
     It is found nowhere else.
16.     Where is the largest unbroken rain forest in the world?
     Amazon jungle of Brazil
17.     What percent of the world's species faces extinction today?
     20%
18.     Animals that exist only in zoos or in other protected areas are called "________________ ."
     extinct in the wild
19.     Where are seeds kept for protection against their species' extinction?
     seed banks
20.     To preserve seeds, should they be kept cool and dry or warm and damp?
     cool and dry
21.     What can one person do to preserve the state of the earth?
     discussion
© Educational Video Network, Inc. 2005 - www.evndirect.com
Your leading source for curriculum-based educational videos and DVDs.