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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. Symbiotic relationship from which both organisms derive some benefit






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






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






4. The nitrogen locked up in the wastes and dead tissues is released by the action of the bacteria of decay - which convert the proteins into ammonia






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






6. Include saprophytic organisms and organisms of decay






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






8. 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






9. First to resettle a virgin area






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






11. Receive less than ten inches of rain each year; the rain is concentrated within a few heavy cloudbursts -ex: Sahara in Africa and Gobi in Asia






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






13. 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






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






15. Lichens and moss






16. Animals that consume green plants (herbivores)






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






18. Include reproduction and protection from predators and destructive weather






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






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






21. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat






22. The ultimate source of energy for all organisms






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






24. Recycle water - oxygen - and phosphorus






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






26. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food






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






28. 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






29. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins






30. 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






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






32. Animals that consume dead animals






33. 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






34. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






35. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures






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






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






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






39. Sunlit layer of the open sea extending to a depth of 250-600ft






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






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






42. Only animal life and other heterotrophic life exists






43. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids






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






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






46. Nekton and benthos - scavengers - and predators (fiercely competitive)






47. 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






48. Rivers - lakes - ponds - and marshes






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






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