Unit 3 Biomes, Microhabitats, and Biodiversity

Which best explains biodiversity?

• The population of a species in an ecosystem

• The variety of species in an ecosystem

• The study of life

• The difference number of biomes on Earth

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Which ecosystem has the greatest amount of biodiversity?

• Polar regions

• Deciduous forest

• Tundra

• Tropical rainforest

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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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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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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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Why do these two microhabitats located in the same biome support different varieties of life?

• Because the climates are very different in each location.

• Different animals prey on the different insects.

• Because the microhabitats each have different resources.

• Because the tree is dead, it can't support life.

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Which of the following situations contributes to stability in an ecosystem?

• increase in biodiversity

• decrease in biodiversity

• extinction of a population from the ecosystem

• removal of many populations of organisms

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Some plants have a waxy thick coat with thorns. Where would you find this type of plant?

• Grassland

• Tundra

• Desert

• Forest

Which food web would be likely to survive if a one species of plant were lost due to disease?

• Food Web 2, the feeding relationships are less complex

• Food Web 1, most herbivores can eat other organisms.

• Food Web 1, has the greater number of 1st level consumers.

• Food Web 2, a greater number of predators competing for food

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The ocean ecosystem has a high sustainability because of

• strong, persistent currents

• predator/prey relationships

• green plants growing on the bottom

• the large variety of different organisms

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