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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. Includes climate - temperature - availability of light and water - and the local topology






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






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






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






5. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






6. Crawling and sessile organsms






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






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






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






10. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada






11. Vegetation such as vines and eppiphytes






12. Rivers - lakes - ponds - and marshes






13. Lichens and moss






14. Algae - sponges - clams - snails - sea urchins - starfish - and crabs






15. Affect the type of vegetation that can be supported






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






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






18. 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






19. Conserve water actively






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






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






22. Polar bears - musk oxen - and arctic hens






23. 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






24. Determines water holding capacity






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






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






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






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






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






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






31. 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






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






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






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






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






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






37. Animals that consume only plants or plant foods






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






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






40. Links between oceans and land






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






42. Animals that consume green plants (herbivores)






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






44. The oceans






45. Organisms that manufacture their own food






46. 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






47. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






48. First to resettle a virgin area






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






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