Unit 7 Review

When biodiversity goes up...

• sustainability stays the same
• sustainability goes down
• sustainability goes up
• sustainability is unaffected

Which of these explains why an ecosystem is healthy when it has a variety of species?

• An increased number of species allows for fewer food chains.

• A larger number of species reduces competition for abiotic resources

• A larger number of species allows for greater diversity in interdependence.

• An increased number of species contributes to greater chances for adaptability.

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Biodiversity refers to

• extinct species
• the variety of species on Earth
• nonrenewable resources
• the rate of species decline

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The higher the biodiversity, the more sustainable an ecosystem is.

• True
• False

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Succession that occurs in an area with no soil is called

• ecological succession

• primary succession

• secondary succession

• pioneer speciles

If a biome begins to change from one type to another (Due to climate change), what will most likely happen to the organisms in the biome?

• The organisms will increase population.

• The new biome will not be able to support the existing organisms.

• There will be no change.

What factor contributes the most to the sustainability of a habitat?

• competition among large predators
• large variety of organisms
• presence of volcanic rock
• absence of bacterial species

Even a small area, such as a schoolyard, contains many microhabitats. Each microhabitat would probably contain a wide variety of organisms. What would the organisms in a single microhabitat have in common?

• They would all be about the same size
• They would all depend on each other for food and shelter
• They would all be the same species
• They would not have anything in common

Increasing biodiversity affects the sustainability of an ecosystem by

• always decreasing competition for limited resources within an ecosystem

• allowing an ecosystem to survive many changes

• preventing an ecosystem from surviving many changes

• always increasing competition for limited resources within an ecosystem

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Why is biodiversity so important?

• Because all species depend on each other to survive, so if one becomes extinct another species that relies on it could go extinct as well
• Because it’s better to have only one variation of each species.
• Because it better to only have a few species on Earth.
• Honestly, I have no idea what biodiversity is!

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NGSS.MS-LS2-5