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Ecology: Organisms and Their Environments

Ecology: Organisms and Their Environments

Ecology: Organisms and Their Environments: You Are Our Density 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 inthe 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 likelydeveloping.
8. What happens to population growth rate as population size approaches the carrying capacity?It approaches zero.
9. Density-dependent factors lead tonegative growth.
10. An energy pyramid for a community would contain which of the following information?The number of trophic levels