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






2. Organisms that manufacture their own food






3. Symbiotic relationship from which both organisms derive some benefit






4. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






5. Developed long legs and many are hoofed






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






7. The ultimate source of energy for all organisms






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






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






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






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






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






13. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada






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






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






16. Adaptations for maintaining their internal osmolarity and conserving water






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






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






19. Animals that consume only plants or plant foods






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






21. 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






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






23. The chief disruptive force






24. 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






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






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






27. 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






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






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






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






31. Animals that consume dead animals






32. Polar bears - musk oxen - and arctic hens






33. 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






34. Forest floors contain moss and lichens






35. Deer - fox - woodchuck - and squirrel






36. Include reproduction and protection from predators and destructive weather






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






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






39. The study of interactions between organisms and their environment






40. Animals that consume green plants (herbivores)






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






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






43. 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






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






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






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






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






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






49. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores






50. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die







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