Enter your Name:   Enter your E-mail Address:  Define the following terms: 01a. Ecology 01b. Abiotic 01c. Biotic 01d. Carrying capacity 01e. Limiting resource 01f. Detritus 01g. Productivity 01h. Carbon fixation 02. A certain species of fish feeds exclusively on green macroalgae within an ecosystem. Suppose there was a drastic change in an abiotic factor of the ecosystem that did not directly affect the fish. Could the fish population still be affected? How? 03. Give two factors that keep most populations in creation from experiencing a population explosion. 04. A species of lobster inhabits the crevices beneath a fringing coral-reef ecosystem. There are few openings under the corals, and every nook seems to be filled with a lobster. Is this struggle for living space an example of intraspecific or interspecific competition? 05. If a company is considering mass-harvesting a natural population of a specific organism, why is it important to know the organism's feeding habits as well as its predators? 06a. The dinoflagellates called zooxanthellae are in a symbiotic relationship with coral. What type of symbiosis is this? 06b. Cleaner fishes set up stations in the ocean, where they will feed on parasites and dead tissue of other fishes. What type of symbiosis is this? 06c. What is the difference between these two examples of symbiosis? 07. Name the trophic levels in the following food chain: kelp, sea urchins, sea otters. In an ecological pyramid, which level has the most energy and largest population? 08. Is detritus a completely nonliving material? 09. Explain why knowing the primary productivity within an ecosystem does not help a scientist to guess the population of phytoplankton in that system. 10. What is the one important difference between the carbon cycle and the nitrogen cycle? 11. Describe the difference between a benthic organism and a pelagic organism. 12. Where is the aphotic zone in the ocean? 13. A benthic organism never sees sunlight, but it lives on the continental shelf. In what region of the ocean does it live? 14. In an aquarium, if there are not enough of a certain type of bacteria, the wastes from the fish cause a rise in the ammonia levels in the tank, which can harm the fish. In our discussion of the nitrogen cycle, what did we call the process by which these bacteria get rid of the ammonia? 15. In the carbon cycle, what gets rid of dissolved carbon dioxide in the ecosystem?