Biodiversity and Ecosystems Review

The variety of different organisms found in an ecosystem is called:

• a population

• biodiversity

• an ecosystem service

• symbiosis

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Why are invasive species a problem?

• Invasive species are originally from an area and take over it.

• Invasive species are prey to many animals so they must keep large populations.

• Invasive species have no predators in their new ecosystems so they grow quickly and become very large.

• Invasive species keep the ecosystems in equilibrium by having large numbers.

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An ecosystem with a large number of individuals can have a low biodiversity.

• True, if there are large numbers of only a few species

• False, larger numbers mean more biodiversity

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A rainforest has an abundance of different plant and animal species. This is an example of what?

• high biodiversity

• low biodiversity

• conservation of biodiversity

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Which is the biggest threat to biodiversity?

• human activity

• diseases

• habitat alteration

• introduced species

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What is an ecosystem?

• The area of land where animals live

• A community of insects that work together

• A community of organisms together with its environment

• The section of a terrarium where plants grow

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If fish are caught faster than they can breed the population will _____________

• increase
• stay the same
• emigrate
• decrease

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If all the members of a species disappears from Earth, the species is said to be?

• Threatened
• Endangered
• Extinct
• Keystone species

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The loss of a natural habitat is called?

• Habitat development
• biodiversity
• Pollution
• Habitat destruction

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Which activity can disrupt provisioning services?

• Planting trees

• Overharvesting

• Recycling

• Composting

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