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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. 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






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






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






4. Animals that eat both plants and animals






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






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






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






8. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria






9. Animals that consume dead animals






10. 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






11. More than 70% of earth -plants have little controlling influence in communities -most stable ecosystems; the conditions affecting temperature - amount of available oxygen and cabon dioxide - and amount of suspended or dissolve materials are very stab






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






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






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






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






16. Characterized by low rainfall - although considerably more than the desert biomes receive -provide no shelter for herbivorous mammals from carnivorous predators -ex: East of the Rockies - steppes of the Ukraine - and the pampas of Argentina






17. The oceans






18. 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






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






20. Only animal life and other heterotrophic life exists






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






22. 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






23. 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






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






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






26. Forest floors contain moss and lichens






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






28. Individuals belonging to the same species use the same resources and if a particular resource is limited - then these organisms must compete with one another






29. Animals that consume green plants (herbivores)






30. 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






31. The metabolically produced CO2 is released to the air. The rest of the orgnaic carbon remains locked whthin an organism until its death (except for wastes given off) - at which time decay processes by bacteria return the CO2 to the air






32. Symbiotic relationship from which both organisms derive some benefit






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






34. The ultimate source of energy for all organisms






35. Developed long legs and many are hoofed






36. Determines water holding capacity






37. 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






38. Lichens and moss






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






40. 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






41. 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






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






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






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






45. Receive less than ten inches of rain each year; the rain is concentrated within a few heavy cloudbursts -ex: Sahara in Africa and Gobi in Asia






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






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






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






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






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