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






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






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






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






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






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






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






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






9. Animals that eat both plants and animals






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






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






12. 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






13. 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






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






15. Determines water holding capacity






16. 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






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






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






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






20. Links between oceans and land






21. 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






22. 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






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






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






25. 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






26. Symbiotic relationship from which both organisms derive some benefit






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






28. Animals that consume only plants or plant foods






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






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






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






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






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






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






35. 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






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






37. The chief disruptive force






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






39. Conserve water actively






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






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






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






43. Polar bears - musk oxen - and arctic hens






44. Animals that consume green plants (herbivores)






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






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






47. 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






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






49. Animals that feed on secondary consumer






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