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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. The chief disruptive force






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






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






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






5. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food






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






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






8. 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






9. 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






10. Recycle water - oxygen - and phosphorus






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






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






13. Polar bears - musk oxen - and arctic hens






14. The oceans






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






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






17. Rivers - lakes - ponds - and marshes






18. 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






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






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






21. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins






22. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition






23. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures






24. 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






25. 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






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






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






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






29. 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






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






31. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion






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






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






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






35. Animals that consume dead animals






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






37. Animals that feed on secondary consumer






38. 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






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






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






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






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






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






44. Determines water holding capacity






45. 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






46. Developed long legs and many are hoofed






47. Regiong beneatht he photic zone that receives no light






48. Forest floors contain moss and lichens






49. 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






50. 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







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