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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. 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






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






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






4. Rock and soil surface






5. 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






6. Food chain is not a simple linear chain but an intricate web






7. Polar bears - musk oxen - and arctic hens






8. Community in an ecological succession is identified by a dominant species






9. Individuals belonging to the same species use the same resources and if a particular resource is limited - then these organisms must compete with one another






10. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






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






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






13. 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






14. 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






15. Recycle water - oxygen - and phosphorus






16. Animals that eat both plants and animals






17. 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






18. The oceans






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






20. Animals that consume only plants or plant foods






21. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms






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






23. First to resettle a virgin area






24. Animals that consume dead animals






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






26. Deer - fox - woodchuck - and squirrel






27. 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






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






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






30. Include saprophytic organisms and organisms of decay






31. 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






32. Animals that consume green plants (herbivores)






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






34. 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






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






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






37. 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






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






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






40. 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






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






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






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






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






45. 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






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






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






48. Adaptations for maintaining their internal osmolarity and conserving water






49. Symbiotic relationship from which both organisms derive some benefit






50. Distinct community in a geographic region






Can you answer 50 questions in 15 minutes?



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