Biodiversity Quiz Review

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Questions and Answers

Variation of ecological habitats within a species is characteristic of which type of diversity? (Select all that apply)

  • Species diversity
  • Regional diversity
  • Genetic diversity
  • Ecosystem diversity (correct)

The variety of organisms within an ecosystem is characteristic of which type of diversity? (Select all that apply)

  • Species diversity (correct)
  • Ecosystem diversity
  • Regional diversity
  • Genetic diversity

What happens to the other organisms in a food chain when an organism in the middle of the food chain is lost?

The organisms below it will increase in number, while the organisms above it will decrease in number.

What are the possible consequences of adding an organism to a food chain?

<p>The organism that is added will compete for food resources with an existing organism, possibly leading to competitive exclusion.</p> Signup and view all the answers

How does a decrease in biodiversity impact an ecosystem?

<p>A decrease in biodiversity causes a decrease in ecosystem stability.</p> Signup and view all the answers

The loss of an organism at the bottom of a food chain negatively impacts all organisms in the chain.

<p>True (A)</p> Signup and view all the answers

Adding an organism to a food chain does not affect the other members of the food chain, but removing an organism does.

<p>False (B)</p> Signup and view all the answers

Explain how microevolution and migration can affect an ecosystem.

<p>Migration can negatively impact an ecosystem if it leads to the loss of native species; temporary migration can maintain biodiversity.</p> Signup and view all the answers

When might an increase in biodiversity lead to a decrease in the stability of an ecosystem?

<p>An increase in biodiversity usually increases stability, but an invasive species can lead to decreased stability.</p> Signup and view all the answers

What happens when an organism is removed from a food chain?

<p>Removing an organism from a food chain causes the populations of the other organisms in the food chain to change as well.</p> Signup and view all the answers

Flashcards

Ecosystem diversity

Variation of ecological habitats within a species.

Species diversity

The variety of different organisms living within an ecosystem.

Loss of middle organism

Organisms below increase, organisms above decrease in number.

Adding an organism consequences

New organism competes, possibly leading to competitive exclusion.

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Biodiversity decrease impact

A decrease in biodiversity causes a decrease in ecosystem stability.

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Migration's effect on ecosystems

Migration can negatively impact an ecosystem if it leads to the loss of native species; temporary migration can maintain biodiversity.

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Removing an organism

Removing an organism from a food chain causes the populations of the other organisms in the food chain to change as well.

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Biodiversity vs Stability

An increase in biodiversity usually increases stability, but an invasive species can lead to decreased stability.

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Study Notes

Ecological Diversity

  • Ecosystem diversity refers to the variation of ecological habitats within a species.
  • Species diversity describes the variety of organisms present within an ecosystem.

Food Chain Dynamics

  • Loss of an organism in the middle of a food chain results in increased numbers of organisms below it and decreased numbers of organisms above it.
  • Adding an organism to a food chain increases competition for resources, which can lead to competitive exclusion of existing species.

Impact of Biodiversity on Ecosystems

  • Decreased biodiversity leads to lower ecosystem stability; changes to one organism significantly affect the entire system.
  • Higher biodiversity allows for some species loss to be compensated by adaptations from other organisms, enhancing resilience.

Food Chain Consequences

  • The loss of an organism at the base of a food chain negatively affects all organisms in that chain, disrupting the entire ecosystem.
  • Both the removal and addition of an organism can impact all members of a food chain; it's a false statement to claim only removal affects the chain.

Migration and Microevolution

  • Permanent migration can harm ecosystems by leading to the loss of native species.
  • Temporary migrations can help maintain ecosystem biodiversity; for example, migratory birds in winter.
  • Microevolution, similar to migration, can aid in the survival of native species by allowing adaptation to changing conditions.

Invasive Species and Stability

  • While increased biodiversity generally enhances ecosystem stability, the introduction of invasive species can result in decreased stability due to competitive advantages over native species.

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