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






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






3. 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






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






5. 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






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






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






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






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






10. Conserve water actively






11. Determines water holding capacity






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






13. Distinct community in a geographic region






14. Organisms that manufacture their own food






15. Determines the nature of plant and animal life in the soil






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






17. Links between oceans and land






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






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






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






21. Animals that consume primary consumers (carnivores)






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






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






24. 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






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






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






27. 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






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






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






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






31. The chief disruptive force






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






33. 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






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






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






36. Include saprophytic organisms and organisms of decay






37. Rivers - lakes - ponds - and marshes






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






39. 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






40. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes






41. 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






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






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






44. Recycle water - oxygen - and phosphorus






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






46. Symbiotic relationship from which both organisms derive some benefit






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






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






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






50. 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