Habitat Destruction and Endangered Species

In 2002, fewer than 200 Siberian tigers remained in the wild due to overhunting and habitat destruction. If this trend continues, what will most likely happen to the Siberian tiger species?

• they may decrease to the point of extinction

• they may develop into a new species

• they will increase in number

• they will find a new place to live

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Which of the following human activities have helped to save the biodiversity of an ecosystem?

• draining water from wetlands

• removing predators from an ecosystem

• setting up wildlife refuges and protected parks

• introducing new species to ecosystems

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When a species is so rare that it may become extinct it is considered _______________.

• diverse

• endangered

• well camouflaged

• recovered

Explain the relationship between extinction and biodiversity.

• Extinction contributes to an increase in biodiversity

• Extinction contributes to a decrease in biodiversity

• Extinction randomly changes biodiversity in one direction or the other

• Extinction has no impact on biodiversity

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If none of the individuals within a particular species can survive to reproduce, what will happen to that species?

• They will increase in number

• They will adapt to a new environment

• They will become extinct

• They will evolve into a new species.

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If you are talking about the variety of species that make up a community, you are talking about ________.

• biodiversity

• biomass

• biotic factors

• biomes

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Key deer are the smallest species of deer found in North America. Clearing the land to build houses has slowly destroyed their habitat. Laws do not allow the deer to be hunted as the species is in danger of dying out. The Key deer can be classified as ________.

• a thriving species

• an extinct species

• a balanced species

• an endangered species

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What happens when an ecosystem becomes less biodiverse?

• The health of the ecosystem increases.

• The health of the ecosystem decreases.

• The health of the ecosystem remains the same.

• The ecosystem cannot survive.

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2. If the last three animals of a species are all females, what will happen to the species?

• Since females have babies, no males are needed to reproduce.

• The species will become extinct because it takes a male and a female to reproduce.

• The species will slowly grow in numbers.

• The species will not be affected by all three members being female.

If all of the predators in an ecosystem are killed off, what happens to organisms that are their food source?

• The number of remaining organisms decreases.

• The number of organisms reaches a balance and stays the same.

• The number of organisms increases.

• Some of the consumers evolve into predators.

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