Name Class Date Ecology Unit Test Multiple Choice Write the letter that best answers the question or completes the statement on the line provided. _____ 1. All the interconnected feeding relationships in an ecosystem make up a food a. interaction. c. network. b. chain. d. web. _____ 2. Nitrogen fixation is carried out primarily by a. humans. c. bacteria. b. plants. d. consumers. _____ 3. Animals that get energy by eating the carcasses of other animals that have been killed by predators or have died of natural causes are called a. scavengers. c. heterotrophs. b. omnivores. d. detritivores. 4. There are 150 Saguaro cactus plants per square kilometer in a certain area of desert. To which population characteristic does this information refer? a. growth rate c. age structure b. geographic range d. population density _____ 5. The movement of organisms from one ecosystem into another ecosystem is called a. immigration. c. population b. emigration. d. carrying capacity. _____ 6. For most populations that are growing, as resources start to become less available, the population declines rapidly. reaches carrying capacity. a. c. b. increases more rapidly. d. enters a of exponential growth. _____ 7. Sea otters live in the ocean. Which of the following is NOT likely to be a limiting factor on the sea otter population? a. disease c. drought b. competition d. predation _____ 8. Each of the following is a density-dependent limiting factor EXCEPT a. competition. c. crowding. b. temperature. d. disease. _____ 9. Which of the following is a biotic aspect of an organism’s niche? the water in the area amount of sunlight a. b. c. the way it gets food d. composition of soil _____ 10. An interaction in which an animal feeds on plants is called a. carnivory. c. predation. b. herbivory. d. symbiosis. _____ 11. A symbiotic relationship in which both species benefit is a. commensalism. c. predation. b. mutualism. d. parasitism.
Name Class Date Ecology Unit Test Multiple Choice Write the letter that best answers the question or completes the statement on the line provided. _____ 1. All the interconnected feeding relationships in an ecosystem make up a food a. interaction. c. network. b. chain. d. web. _____ 2. Nitrogen fixation is carried out primarily by a. humans. c. bacteria. b. plants. d. consumers. _____ 3. Animals that get energy by eating the carcasses of other animals that have been killed by predators or have died of natural causes are called a. scavengers. c. heterotrophs. b. omnivores. d. detritivores. 4. There are 150 Saguaro cactus plants per square kilometer in a certain area of desert. To which population characteristic does this information refer? a. growth rate c. age structure b. geographic range d. population density _____ 5. The movement of organisms from one ecosystem into another ecosystem is called a. immigration. c. population b. emigration. d. carrying capacity. _____ 6. For most populations that are growing, as resources start to become less available, the population a. declines rapidly. c. reaches carrying capacity. b. increases more rapidly. d. enters a of exponential growth. _____ 7. Sea otters live in the ocean. Which of the following is NOT likely to be a limiting factor on the sea otter population? a. disease c. drought b. competition d. predation _____ 8. Each of the following is a density-dependent limiting factor EXCEPT a. competition. c. crowding. b. temperature. d. disease. _____ 9. Which of the following is a biotic aspect of an organism’s niche? a. the water in the area b. amount of sunlight c. the way it gets food d. composition of soil _____ 10. An interaction in which an animal feeds on plants is called a. carnivory. c. predation. b. herbivory. d. symbiosis. _____ 11. A symbiotic relationship in which both species benefit is a. commensalism. c. predation. b. mutualism. d. parasitism.