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






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






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






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






5. 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






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






7. First to resettle a virgin area






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






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






10. 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






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






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






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






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






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






16. Crawling and sessile organsms






17. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down






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






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






20. One species may be competitively superior to the other and drive the second to extinction






21. 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






22. Organisms that manufacture their own food






23. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor






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






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






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






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






28. Animals that feed on secondary consumer






29. 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






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






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






32. Include saprophytic organisms and organisms of decay






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






34. Rivers - lakes - ponds - and marshes






35. Rock and soil surface






36. 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






37. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms






38. Symbiotic relationship from which both organisms derive some benefit






39. Determines water holding capacity






40. Polar bears - musk oxen - and arctic hens






41. Conserve water actively






42. 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






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






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






45. Affect the type of vegetation that can be supported






46. Deer - fox - woodchuck - and squirrel






47. 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






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






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






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