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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. 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






2. Animals that feed on secondary consumer






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






4. Rhododendrons and pines are more suited for growth in acid oil






5. 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






6. 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






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






8. Rock and soil surface






9. First to resettle a virgin area






10. 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






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






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






13. Animals that consume primary consumers (carnivores)






14. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat






15. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment






16. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes






17. Include reproduction and protection from predators and destructive weather






18. Rivers - lakes - ponds - and marshes






19. 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






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






21. 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






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






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






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






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






26. Symbiotic relationship from which both organisms derive some benefit






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






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






29. Animals that eat both plants and animals






30. 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






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






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






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






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






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






36. Deer - fox - woodchuck - and squirrel






37. Polar bears - musk oxen - and arctic hens






38. Determines water holding capacity






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






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






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






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






43. Treeless - frozen plain found between the taiga lands and the northern ice sheets - very short summer and thus a very short growing season during which time the ground becomes wet and marshy






44. Conserve water actively






45. Affect the type of vegetation that can be supported






46. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down






47. 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






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






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






50. Crawling and sessile organsms