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PCAT Biology Ecology

Subjects : pcat, biology
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures






2. Crawling and sessile organsms






3. When one organism is benefited by the association and the other is not affected






4. Consists of populations of different plants and animal species interacting with each other in a given environment






5. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die






6. Lichens and moss






7. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by






8. Rock and soil surface






9. Free-living organisms that feed on other living organisms






10. Vegetation has evolved adaptations for water conservation such as needle shaped leaves






11. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include






12. Region exposed to low tides that undergoes variations in temperature and periods of dryness






13. The chief disruptive force






14. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe






15. Animals that consume only plants or plant foods






16. Region typical of the open seas and can be divided into photic and aphotic zones






17. Frozen area with no vegetation and terrestrial animals -animals that do inhabit polar regions generally live near the polar oceans






18. Animals that consume green plants (herbivores)






19. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival






20. Rivers - lakes - ponds - and marshes






21. Include reproduction and protection from predators and destructive weather






22. Animals that consume primary consumers (carnivores)






23. Food chain is not a simple linear chain but an intricate web






24. Needs constant energy source and cycling of materials between the living system






25. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition






26. Encompasses all that is external to the organism and is necessary for its existence






27. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches






28. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms






29. Organisms that manufacture their own food






30. Determine by the amount of decaying plant and animal life in the soil






31. Algae - crabs - crustacea - and many different species of fish






32. Symbiotic relationship from which both organisms derive some benefit






33. Group of organisms of the same species living together in a given location






34. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere






35. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active






36. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae






37. Any group of similar organisms that are capable of reproducing






38. Have adaptations enabling them to survive in very cod water - with high pressures - and in complete darkness






39. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






40. The oceans






41. When a parasite benefits at the expense of the host






42. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria






43. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






44. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment






45. Forest floors contain moss and lichens






46. The study of interactions between organisms and their environment






47. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds






48. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores






49. The ultimate source of energy for all organisms






50. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying