Biodiversity, Sustainability, Biotic Interactions

What is biodiversity?

• It's the number of animals in nature.

• It's the genetic variation in a species.

• It's the number of species that exist in a particular area or in the world.

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The more diverse an ecosystem is the more...

• ... vulnerable it is to climate change.

• ... endangered it is to habitat fragmentation.

• .... resistant it is to environment changes.

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Food provides animals with the materials and energy they need for growth, warmth, and motion. Plants get material for growth mostly from air and water, and obtain energy from sunlight.

Producers provide food to consumers because ―

• many animals prefer eating plants to eating meat
• plants can easily make food from soil and water
• animals cannot produce their own food
• plants are more abundant in ecosystems

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A drought has hit this grassland biome. How will this effect the rabbit population?

• The rabbits will increase in number.
• The rabbit population will stay the same.
• The rabbit population will decrease.
• The rabbit population will become extinct immediately.

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Sustainability refers to

• how many species are present in an ecosystem
• when a species goes extinct
• how long a species lives
• the ability to maintain ecological process over long periods of time.

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

• True
• False

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Which best explains why producers are at the beginning of all food chains?

• They turn dead animals into nutrients
• They provide shelter for smaller animals
• The transfer energy from the sun into food

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Brown trout consume (eat) more tadpoles when the fly larvae reduce in number (decrease).  This proves...

• The dependence of organisms and biodiversity in an ecosystem
• Diversity increases as organisms decrease
• Losing an animal is good for ecosystems
• Changes in ecosystems create new organisms

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Field mice eat corn. Which would most likely happen if the field mouse population grew?

• There would be more corn to feed the field mice.
• There would be less corn due to the mice eating it.
• The habitat would get overpopulated because the mice woudl eat too much.

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In this tundra food web, if grasses were removed what would happen to the sustainability of the ecosystem?

• There would be an overpopulation of arctic hares and lemmings.
• Polar bears would move to a new ecosystem
• The ecosystem would collapse because it lost its main producer
• Wildflowers would die out from the ecosystem

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