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Exam__4 - Exam 4 WHITE 1 Although primary producers can...

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Page 1 Spring 07 1362 Exam 4 WHITE 1. Although primary producers can capture light (solar) energy to fix CO 2 , they are absolutely dependent upon the _______ to provide them with usable forms of nitrogen and minerals. A) carnivores B) decomposers C) autotrophs D) omnivores Ans: B 2. Species richness has been observed to increase with primary productivity—to a point. At high levels of productivity, species richness decreases. Which of the following explains this phenomenon? A) Competitive exclusion B) Predation C) Herbivory D) Decomposition E) None of the above Ans: A 3. The populations of different species that live in a given region is called a ___________; a(n) ___________ is the term used to describe these groups and the physical environment they live in. 4. The feeding relationships among the species in a community determine the community's Use the following to answer questions 5-7: A B C D Number of individuals Time 5. This graph 6. This population would be more susceptible to the effects of density-independent factors at what point? A) A B) B C) C D) D E) The population would be equally susceptible to such factors at all of these points. Ans: E
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Page 2 7. The consequence(s) of reducing the number of individuals in this population to a level just below B would be to 8. The following are true concerning altruistic behavior except :
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