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






2. 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






3. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes






4. 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






5. Crawling and sessile organsms






6. Conserve water actively






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






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






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






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






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






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






13. The chief disruptive force






14. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






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






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






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






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






19. Rivers - lakes - ponds - and marshes






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






21. Recycle water - oxygen - and phosphorus






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






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






24. Determines water holding capacity






25. 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






26. Animals that consume only plants or plant foods






27. 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






28. 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






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






30. Animals that feed on secondary consumer






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






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






33. Affect the type of vegetation that can be supported






34. First to resettle a virgin area






35. Animals that consume primary consumers (carnivores)






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






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






38. Organisms that manufacture their own food






39. 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






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






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






42. Lichens and moss






43. Symbiotic relationship from which both organisms derive some benefit






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






45. Include reproduction and protection from predators and destructive weather






46. Deer - fox - woodchuck - and squirrel






47. 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






48. Animals that eat both plants and animals






49. Animals that consume green plants (herbivores)






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