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Basic Biology Practice Test: Community Ecology
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Community ecology is a branch of ecology that studies the factors that affect biodiversity and community structure. It examines the interactions between organisms in a habitat, including the distribution, structure, abundance, and interactions between coexisting populations.  Community ecology seeks to answer questions such as: How does the depth of a lake affect the complexity of the community living within it? Why do some places have more species than others? Is there competition in nature?   Community ecology focuses on interactions between populations as determined by specific... Show more
Basic Biology Practice Test: Community Ecology
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25 Questions

1. The feeding relationships among the species in a community determine the community's
2. What percent of all species on Earth are parasites?
3. Which of the following is an example of aposematic coloration?
4. Evidence shows that some grasses benefit from being grazed. Which of the following terms would best describe this plant-herbivore interaction?
5. The principle of competitive exclusion states that
6. Which of the following is an example of Batesian mimicry?
7. Imagine five forest communities, each with 100 individuals distributed among four different tree species (W, X, Y, and Z). Which forest community would be most diverse?
8. In a particular case of secondary succession, three species of wild grass all invaded a field. By the second season, a single species dominated the field. A possible factor in this secondary succession was
9. Which statement best describes the evolutionary significance of mutualism?
10. As you study two closely related predatory insect species, the two-spot and the three-spot avenger beetles, you notice that each species seeks prey at dawn in areas without the other species. However, where their ranges overlap, the two-spot avenger beetle hunts at night and the three-spot hunts in the morning. When you bring them into the laboratory and isolate the two different species, you discover that the offspring of both species are found to be nocturnal. You have discovered an example of
11. Food chains are sometimes short because
12. Which of the following is an example of Müllerian mimicry?
13. A community's actual evapotranspiration is a reflection of
14. The energetic hypothesis and dynamic stability hypothesis are ideas that attempt to explain
15. According to bottom-up and top-down control models of community organization, which of the following expressions would imply that an increase in the size of a carnivore (C) population would negatively impact on its prey (P) population, but not vice versa?
16. Approximately how many kg of carnivore biomass can be supported by a field plot containing 1,000 kg of plant material?
17. During the course of the formation of a parasite/host relationship, a critical first step in this evolution would be
18. Zoonotic disease
19. The oak tree pathogen, Phytophthora ramorum, has migrated 650 km in 10 years. West Nile virus spread from New York State to 46 other states in 5 years. The difference in the rate of spread is probably related to
20. Resource partitioning would be most likely to occur between
21. Species richness increases
22. Elephants are not the most dominant species in African grasslands, yet they influence community structure. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario?
23. Monarch butterflies are protected from birds and other predators because of cardiac glycosides they incorporate into their tissues from eating milkweed when they were in their caterpillar stage. The wings of a different species of butterfly, the Viceroy, look nearly identical to the Monarch so predators that have learned not to eat the bad-tasting Monarch avoid Viceroys as well. This example best describes
24. Based on the intermediate disturbance hypothesis, a community's species diversity is increased by
25. Why do tropical communities tend to have greater species diversity than temperate or polar communities?

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