Question 1

List and briefly explain one way each how human activities are impacting biogeochemical cycles of carbon,nitrogen,phosphorous and water.

Accepted Answer

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Question 2

All of the following traits are characteristic of the adaptations of prey EXCEPT:
A)producing toxins
B)having the appearance of twigs or leaves.
C)warning coloration.
D)All of the above are characteristic prey adaptations.

Accepted Answer

All of the listed traits are examples of adaptations that prey can use to avoid being eaten by predators. Therefore, none of the options are incorrect and the correct answer is D, as it states that all of the listed traits are characteristic of prey adaptations.

Question 3

In relationships that involve predation or herbivory,the organism that is the victim often has various defenses against being consumed.Compare and contrast plant defenses against herbivores and animal prey defenses against predators.

Accepted Answer

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Question 4

Define keystone species and discuss an example of an organism that is a keystone species.

Accepted Answer

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Question 5

Define ecological niche and explain the role of limiting resources as well as resource partitioning in the determination of an organism's ecological niche.Use examples to illustrate your response.

Accepted Answer

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Question 6

Define competition.Compare and contrast intraspecific competition and interspecific competition.

Accepted Answer

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Question 7

Explain the meaning and importance of "nitrogen fixation." Give a specific example of an organism capable of this process and discuss the relationship this organism has with plants.

Accepted Answer

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Question 8

Define coevolution and list two examples.

Accepted Answer

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Quiz 5: How Ecosystems Work