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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. 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






2. 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






3. Distinct community in a geographic region






4. Developed long legs and many are hoofed






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






6. Animals that consume primary consumers (carnivores)






7. Lichens and moss






8. First to resettle a virgin area






9. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes






10. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat






11. 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






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






13. Rock and soil surface






14. Regiong beneatht he photic zone that receives no light






15. Animals that feed on secondary consumer






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






17. Animals that eat both plants and animals






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






19. Organisms that manufacture their own food






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






21. Animals that consume dead animals






22. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place






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






24. 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






25. Vegetation such as vines and eppiphytes






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






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






28. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes






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






30. 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






31. Polar bears - musk oxen - and arctic hens






32. Forest floors contain moss and lichens






33. Links between oceans and land






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






35. More than 70% of earth -plants have little controlling influence in communities -most stable ecosystems; the conditions affecting temperature - amount of available oxygen and cabon dioxide - and amount of suspended or dissolve materials are very stab






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






37. 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






38. 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






39. 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






40. Affect the type of vegetation that can be supported






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






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






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






44. The oceans






45. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion






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






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






48. Rivers - lakes - ponds - and marshes






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






50. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food







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