AP Biology : Understand biodiversity

Study concepts, example questions & explanations for AP Biology

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Example Questions

Example Question #91 : Ecology

Which of the following is true regarding keystone species?

Possible Answers:

They are always the most abundant species in an ecosystem

The presence of a keystone species collapses the ecosystem

There will be no effect if a keystone species is removed from an ecosystem

Keystone species have a large effect on the ecosystem

Correct answer:

Keystone species have a large effect on the ecosystem

Explanation:

Despite their relatively small abundance, keystone species have a large impact on the environment in which they inhabit. If a keystone species is removed from an ecosystem, then there may be a large change in ecosystem’s stability.

Example Question #92 : Ecology

How does human initiated deforestation impact ecosystems?

Possible Answers:

Decrease in soil erosion

None of these

Decrease in greenhouse gas emissions

Increase in biodiversity

Correct answer:

None of these

Explanation:

Deforestation can be defined as the removal of forests by humans. Deforestation has many negative environmental impacts including soil erosion, a decline in biodiversity, and an increase in greenhouse gas emissions.

Example Question #92 : Ecology

Which of the following is true regarding tropical rainforest biomes?

Possible Answers:

There are three seasons: rainy, dry, and winter

There is little rainfall

Soil is nutrient-rich

They have the greatest biodiversity

Correct answer:

They have the greatest biodiversity

Explanation:

Tropical rainforest biomes have the greatest biodiversity of all biomes. They have only two seasons (rainy and dry) and the soil in these environments is generally nutrient-poor. Tropical rainforests also have a multi-layered canopy that allows little light to penetrate to the ground.

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