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






3. Developed long legs and many are hoofed






4. 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






5. Crawling and sessile organsms






6. Include saprophytic organisms and organisms of decay






7. Links between oceans and land






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






9. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying






10. Vegetation such as vines and eppiphytes






11. Only animal life and other heterotrophic life exists






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






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






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






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






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






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






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






19. 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






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






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






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






23. Determines water holding capacity






24. Animals that eat both plants and animals






25. Animals that consume primary consumers (carnivores)






26. The nitrogen locked up in the wastes and dead tissues is released by the action of the bacteria of decay - which convert the proteins into ammonia






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






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






29. 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






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






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






32. Deer - fox - woodchuck - and squirrel






33. 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






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






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






36. Polar bears - musk oxen - and arctic hens






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






38. The study of interactions between organisms and their environment






39. Symbiotic relationship from which both organisms derive some benefit






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






41. Regiong beneatht he photic zone that receives no light






42. Organisms that manufacture their own food






43. Animals that feed on secondary consumer






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






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






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






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






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






50. The chief disruptive force