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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. Distinct community in a geographic region






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






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






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






5. Affect the type of vegetation that can be supported






6. Polar bears - musk oxen - and arctic hens






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






8. Regiong beneatht he photic zone that receives no light






9. One or both organisms can't survive without the other






10. 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






11. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho






12. Symbiotic relationship from which both organisms derive some benefit






13. Determines water holding capacity






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






15. Animals that consume dead animals






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






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






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






19. Receive less rainfall than the temperate forests - have long - cold winters - and are inhabited by single coniferous tree-the spruce -extreme northern parts of Canada and Russia






20. Rhododendrons and pines are more suited for growth in acid oil






21. An essential component of amino acids and nucleic acids - which are the building blocks of all living things






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






23. Include saprophytic organisms and organisms of decay






24. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat






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






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






27. The major component of the internal environment of all living things






28. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia






29. Include reproduction and protection from predators and destructive weather






30. Treeless - frozen plain found between the taiga lands and the northern ice sheets - very short summer and thus a very short growing season during which time the ground becomes wet and marshy






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






32. Crawling and sessile organsms






33. One species may be competitively superior in some regions - and the other may be superior in other regions under different environmental conditions. this would result in the elimination of one species in some places and the other in other places






34. Animals that feed on secondary consumer






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






36. Includes the community and the environment and usually all five kingdoms






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






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






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






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






41. Animals that eat both plants and animals






42. Characterized by low rainfall - although considerably more than the desert biomes receive -provide no shelter for herbivorous mammals from carnivorous predators -ex: East of the Rockies - steppes of the Ukraine - and the pampas of Argentina






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






44. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor






45. The vegetation that becomes dominant and stable after years of evolutiionary development






46. Used to include only the population and not their physical environment






47. The study of interactions between organisms and their environment






48. Lichens and moss






49. Without a constant input of energy from the sun - an ecosystem would soon run down - as food is transferred from one level of the food chain to the next - a transfer of energy occurs






50. Forest floors contain moss and lichens