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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. Affect the type of vegetation that can be supported






2. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants






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






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






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






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






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






8. 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






9. 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






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






11. 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






12. Crawling and sessile organsms






13. Polar bears - musk oxen - and arctic hens






14. The chief disruptive force






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






17. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms






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






19. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






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






21. 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






22. Animals that feed on secondary consumer






23. Organisms that manufacture their own food






24. Regiong beneatht he photic zone that receives no light






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






26. First to resettle a virgin area






27. Lichens and moss






28. 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






29. The study of interactions between organisms and their environment






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






31. One that exerts control over the other species that are present






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






33. Two fates await the ammonia (NH3). some are nitrified or dentrified






34. 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






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






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






37. Animals that consume green plants (herbivores)






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






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






40. 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






41. Elemental nitrogen is chemically inert and cannot be used by most organisms. Lightning and nitrogen-fixing bacteria in the roots of legumes change the nitrogen into the usable - soluble nitrates






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






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






44. Forest floors contain moss and lichens






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






46. Conserve water actively






47. Determines water holding capacity






48. Include reproduction and protection from predators and destructive weather






49. Recycle water - oxygen - and phosphorus






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