PCA Exam Questions and Answers Already Passed

PCA Exam Questions and Answers Already Passed 7. The nonliving components of an ecosystem are called: A. Biotic compounds B. Abiotic compounds C. Mineral components D. Environmental components B. Abiotic compounds 8. Which of the following ecological concepts is illustrated in a food web? A. Population equilibrium B. mutualism C. Biogeochemical cycles D. Competition B. mutualism 9. What is a limiting factor? A. A biotic factor that stops the growth of a plant of animal B. A factor that is required for the growth and survival of an organism C. One of many soil nutrients that regulates the growth of a plant D. An action made by a consumer that limits the population size of a species B. A factor that is required for the growth and survival of an organism 10. The mean population level around which a species' characteristic abundance fluctuates is the species? A. Density dependence B. Equilibrium position C. Population density D. Abundance level B. Equilibrium position 11. Many agricultural pest species such as foliar pathogens, aphids, mites and small seeded weeds are considered: A. S strategists B. K strategists C. R strategists D. C strategists C. R strategists 12. In general, how does the amount of biodiversity in an agroecosystem compare to that of a natural, more mature ecosystem? Biodiversity level is: A. Equal among most ecosystems B. Lower in an agroecosystem than a natural system C. Higher in an agroecosystem than a natural system D. Not measureable in agroecosystems B. Lower in an agroecosystem than a natural system 13. The goal of pest eradication is generally: A. To eliminate newly invading pests B. Aimed a eliminating exotic pests from a given county C. To reduce existing pest populations D. To discourage damaging pest populations form occurring in a given area A. To eliminate newly invading pests 14. Secondary pests are pests that: A. Damage crop plants but do not kill them B. Become prevalent after control actions have been taken to control key pests C. Damage the crop plant but do not damage the harvested part D. Harm crop plants but never cause enough damage to be economically important B. Become prevalent after control actions have been taken to control key pests 15. What is the relationship between a treatment threshold and an economic injury level? A. A treatment threshold is always higher than the economic injury level B. An economic injury level is always higher than the treatment threshold C. Economic injury levels are equal to treatment thresholds D. Economic injury levels have been determined for all classes of pests buy treatment thresholds have not. B. An economic injury level is