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






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






3. Composed of populations that are able to exist under the new conditions






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






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






6. One species may be competitively superior to the other and drive the second to extinction






7. Individuals belonging to the same species use the same resources and if a particular resource is limited - then these organisms must compete with one another






8. The chief disruptive force






9. Forest floors contain moss and lichens






10. 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






11. Animals that consume dead animals






12. Animals that eat both plants and animals






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






14. Conserve water actively






15. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada






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






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






18. Include saprophytic organisms and organisms of decay






19. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






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






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






22. Animals that consume primary consumers (carnivores)






23. Includes climate - temperature - availability of light and water - and the local topology






24. Algae - sponges - clams - snails - sea urchins - starfish - and crabs






25. 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






26. Integrated system of species that are dependent upon one another for survival






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






28. Include reproduction and protection from predators and destructive weather






29. Animals that consume green plants (herbivores)






30. Crawling and sessile organsms






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






32. 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






33. Lichens and moss






34. Organisms that manufacture their own food






35. The metabolically produced CO2 is released to the air. The rest of the orgnaic carbon remains locked whthin an organism until its death (except for wastes given off) - at which time decay processes by bacteria return the CO2 to the air






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






37. Recycle water - oxygen - and phosphorus






38. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels






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






40. 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






41. 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






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






43. The ultimate source of energy for all organisms






44. Animals that consume only plants or plant foods






45. Determined by the same decisive factors-temperatures and rainfall






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






47. The study of interactions between organisms and their environment






48. Animals that feed on secondary consumer






49. The oceans






50. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish