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






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






3. 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






4. 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






5. Animals that consume green plants (herbivores)






6. Forest floors contain moss and lichens






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






8. Include saprophytic organisms and organisms of decay






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






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






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






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






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






14. Animals that feed on secondary consumer






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






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






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






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






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






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






21. Links between oceans and land






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






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






24. 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






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






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






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






28. The oceans






29. 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






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






31. Regiong beneatht he photic zone that receives no light






32. 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






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






34. 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






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






36. Only animal life and other heterotrophic life exists






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






38. Each member of a food chain uses some of the energy it obtains from its food for its own metabolism and loses some additional energy in the form of heat






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






40. 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






41. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






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






43. Affect the type of vegetation that can be supported






44. Polar bears - musk oxen - and arctic hens






45. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months






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






47. Lichens and moss






48. 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






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






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