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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. Receive less rainfall than the temperate forests - have long - cold winters - and are inhabited by single coniferous tree-the spruce -extreme northern parts of Canada and Russia






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






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






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






5. Animals that eat both plants and animals






6. Regiong beneatht he photic zone that receives no light






7. 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






8. 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






9. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches






10. The study of interactions between organisms and their environment






11. 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






12. Developed long legs and many are hoofed






13. 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






14. Adaptations for maintaining their internal osmolarity and conserving water






15. The ultimate source of energy for all organisms






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






17. Affect the type of vegetation that can be supported






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






19. Only animal life and other heterotrophic life exists






20. Organisms that manufacture their own food






21. 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






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






23. Lichens and moss






24. 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






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






26. Animals that consume only plants or plant foods






27. Crawling and sessile organsms






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






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






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






31. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms






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






33. Animals that consume dead animals






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






35. Determines water holding capacity






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






37. First to resettle a virgin area






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






39. Recycle water - oxygen - and phosphorus






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






41. 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






42. 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






43. Rock and soil surface






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






45. Animals that consume green plants (herbivores)






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






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






48. Deer - fox - woodchuck - and squirrel






49. Rivers - lakes - ponds - and marshes






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