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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. The chief disruptive force






2. Developed long legs and many are hoofed






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






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






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






6. Animals that consume only plants or plant foods






7. Include saprophytic organisms and organisms of decay






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






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






10. 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






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






12. 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






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






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






15. 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






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






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






18. Algae - crabs - crustacea - and many different species of fish






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






20. 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






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






22. First to resettle a virgin area






23. 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






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






25. Polar bears - musk oxen - and arctic hens






26. Include reproduction and protection from predators and destructive weather






27. Crawling and sessile organsms






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






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






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






31. Only animal life and other heterotrophic life exists






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






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






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






35. Vegetation has evolved adaptations for water conservation such as needle shaped leaves






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






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






38. Animals that consume dead animals






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






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






41. 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






42. Determines water holding capacity






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






44. Forest floors contain moss and lichens






45. 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






46. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals






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






48. 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






49. Links between oceans and land






50. Conserve water actively







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