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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. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae






2. 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






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






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






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






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






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






8. 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






9. 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






10. Symbiotic relationship from which both organisms derive some benefit






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






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






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






14. 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






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






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






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






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






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






20. First to resettle a virgin area






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






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






23. Rock and soil surface






24. Lichens and moss






25. The oceans






26. Recycle water - oxygen - and phosphorus






27. 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






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






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






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






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






32. Animals that feed on secondary consumer






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






34. 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






35. Developed long legs and many are hoofed






36. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






37. Adaptations for maintaining their internal osmolarity and conserving water






38. Determines water holding capacity






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






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






41. Animals that eat both plants and animals






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






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






44. 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






45. 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






46. 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






47. The chief disruptive force






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






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






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







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