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






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






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






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






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






6. Rivers - lakes - ponds - and marshes






7. 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






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






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






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






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






12. The ultimate source of energy for all organisms






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






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






15. Two fates await the ammonia (NH3). some are nitrified or dentrified






16. 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






17. The chief disruptive force






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






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






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






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






22. Includes the community and the environment and usually all five kingdoms






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






24. Recycle water - oxygen - and phosphorus






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






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






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






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






30. Include saprophytic organisms and organisms of decay






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






32. Links between oceans and land






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






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






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






36. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food






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






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






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






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






41. Animals that consume only plants or plant foods






42. Animals that consume green plants (herbivores)






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






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






45. Polar bears - musk oxen - and arctic hens






46. Organisms that manufacture their own food






47. Animals that consume primary consumers (carnivores)






48. Forest floors contain moss and lichens






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






50. 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