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






2. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants






3. Rock and soil surface






4. Organisms that manufacture their own food






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






6. Include saprophytic organisms and organisms of decay






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






8. 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






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






10. The ultimate source of energy for all organisms






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






12. Conserve water actively






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






14. Animals that consume green plants (herbivores)






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






16. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food






17. Animals that consume dead animals






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






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






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






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






22. Elemental nitrogen is chemically inert and cannot be used by most organisms. Lightning and nitrogen-fixing bacteria in the roots of legumes change the nitrogen into the usable - soluble nitrates






23. Determines water holding capacity






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






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






26. Forest floors contain moss and lichens






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






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






29. Recycle water - oxygen - and phosphorus






30. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat






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






32. 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






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






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






35. 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






36. Include reproduction and protection from predators and destructive weather






37. The study of interactions between organisms and their environment






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






39. 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






40. Affect the type of vegetation that can be supported






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






42. 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






43. Links between oceans and land






44. Animals that consume only plants or plant foods






45. Rivers - lakes - ponds - and marshes






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






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






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






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






50. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia