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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. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia






2. 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






3. Include saprophytic organisms and organisms of decay






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






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






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






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






8. 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






9. Organisms that manufacture their own food






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






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






12. Deer - fox - woodchuck - and squirrel






13. The ultimate source of energy for all organisms






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






15. Rock and soil surface






16. The study of interactions between organisms and their environment






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






18. Animals that feed on secondary consumer






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






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






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






22. Needs constant energy source and cycling of materials between the living system






23. 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






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






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






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






27. Determines water holding capacity






28. 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






29. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes






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






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






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






33. 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






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






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






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






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






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






39. 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






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






41. 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






42. Lichens and moss






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






44. The chief disruptive force






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






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






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






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






49. Vegetation such as vines and eppiphytes






50. Adaptations for maintaining their internal osmolarity and conserving water