Biodiversity Lesson

Which organisms all consume the same producer?

• Crabs, pilchards, blennies

• Euphausiids, sweeps, water fleas

• Tiger sharks, dolphins, octopuses

• Sea urchins, crabs, octopuses

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• Ginkgo

• honey locust

• Horse chestnut

• black maple

Complete this statement. The more diverse an ecosystem is ----

• the more threatened its populations are

• the more similar the species will be

• the more stable it is

• the few varieties of species are present

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An ecosystem experiences a ten year drought. As a result of the drought, many plant and animal species are not able to survive. What will be the effect on the biodiversity and sustainability of the ecosystem?

• A. Increased biodiversity and increased sustainability

• B. Decreased biodiversity and increased sustainability

• C. Increased biodiversity and decreased sustainability

• D. Decreased biodiversity and decreased sustainability

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Why does higher biodiversity cause an ecosystem to be more sustainable?

• There are more types of organisms competing for living space in the ecosystem.

• There are a greater variety of genes and species in the ecosystem.

• There are more animals preying on one another in the ecosystem.

• More organisms decrease the rate of disease in and ecosystem.

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Which statement below best describes how biodiversity contributes to the sustainability of an ecosystem?

• A. A variety of plant and animal species allows for more survivors of a natural disaster.

• B. Having more species in an ecosystem allows the human population to increase in size.

• C. Low biodiversity reduces the competition for resources, which helps native species survive.

• D. Few species in the ecosystem reduces the likelihood that disease spreads through the ecosystem.

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Based on the table of observations, which ecosystem is likely to be the least sustainable?

• Ecosystem 1, because it has the fewest species

• Ecosystem 2, because it includes both aquatic and terrestrial species.

• Ecosystem 3, because it has few predators.

• Ecosystem 4, because it supports many animals.

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Aluminum is refined from bauxite, which is found in the ground under rainforests. Humans must destroy this habitat to mine the bauxite and make aluminum. This type of habitat destruction will most likely result in ---

• an increase in rainfall

• an increase in number of species

• a decrease in biodiversity

• a decrease in cloud formation

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Which of the following is not an example of how biodiversity contributes to the sustainability of an ecosystem?

• Controlling pest species

• Providing potential for medical discoveries

• Creating a limited gene pool for future generations

• Regulating the chemistry of air and water supply

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Refer to the food web. If the grasses in each ecosystem are attacked and killed by a disease, which ecosystem will most likely survive?

• The prairie ecosystem, because few organisms eat grass.

• The tundra ecosystem, because there is a variety of producers.

• The prairie ecosystem, because there a fewer top predators.

• The tundra ecosystem, because it has more herbivores.

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