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






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






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






4. 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






5. Include saprophytic organisms and organisms of decay






6. The study of interactions between organisms and their environment






7. Polar bears - musk oxen - and arctic hens






8. 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






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






10. The ultimate source of energy for all organisms






11. First to resettle a virgin area






12. 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






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






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






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






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






17. 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






18. Animals that eat both plants and animals






19. Links between oceans and land






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






21. Rivers - lakes - ponds - and marshes






22. 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






23. Only animal life and other heterotrophic life exists






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






25. Animals that consume dead animals






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






27. 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






28. Animals that consume green plants (herbivores)






29. Rock and soil surface






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






31. Consists of populations of different plants and animal species interacting with each other in a given environment






32. Forest floors contain moss and lichens






33. 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






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






35. The oceans






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






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






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






39. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere






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






41. Distinct community in a geographic region






42. Determines water holding capacity






43. Regiong beneatht he photic zone that receives no light






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






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






46. Composed of populations that are able to exist under the new conditions






47. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals






48. Developed long legs and many are hoofed






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






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







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