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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. Lichens and moss






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






3. Affect the type of vegetation that can be supported






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






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






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






7. 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






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






9. Conserve water actively






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






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






12. 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






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






14. 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






15. Polar bears - musk oxen - and arctic hens






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






17. 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






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






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






20. Symbiotic relationship from which both organisms derive some benefit






21. Links between oceans and land






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






23. 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






24. Only animal life and other heterotrophic life exists






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






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






27. The chief disruptive force






28. Include saprophytic organisms and organisms of decay






29. Animals that consume primary consumers (carnivores)






30. Adaptations for maintaining their internal osmolarity and conserving water






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






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






33. Distinct community in a geographic region






34. The study of interactions between organisms and their environment






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






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






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






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






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






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






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






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






43. 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






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






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






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






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






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






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






50. 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