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Ecology: Organisms and Their Environments True or False

1. An organism that has a low risk of dying young will probably have which type of survivorship curve? -> Type II
2. How does nitrogen enter a food chain? -> Bacteria extract it directly from the atmosphere.
3. Food chains and food webs are related in what way? -> Food webs are complexes of multiple food chains.
4. Most of the nitrogen in the world is found in -> the atmosphere.
5. For a species, what is a possible consequence of competitive exclusion? -> The first and second choices
6. The human population size is currently about 7 billion. If the human growth rate decreased from 0.012 to 0.001 today, how many people would be added to the human population next year? -> About 7 million
7. An age pyramid for a country has a small base, bulges in the middle, and has a top that is slightly larger than the base. The country is likely -> developing.
8. What happens to population growth rate as population size approaches the carrying capacity? -> It approaches zero.
9. Density-dependent factors lead to -> negative growth.
10. An energy pyramid for a community would contain which of the following information? -> The number of trophic levels

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