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






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






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






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






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






6. Determines water holding capacity






7. Polar bears - musk oxen - and arctic hens






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






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






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






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






12. 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






13. Developed long legs and many are hoofed






14. Links between oceans and land






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






16. 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






17. Vegetation such as vines and eppiphytes






18. Organisms that manufacture their own food






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






20. Conserve water actively






21. The ultimate source of energy for all organisms






22. Rock and soil surface






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






24. An essential component of amino acids and nucleic acids - which are the building blocks of all living things






25. Lichens and moss






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






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






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






29. Animals that consume green plants (herbivores)






30. Animals that consume primary consumers (carnivores)






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






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






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






35. 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






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






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






38. 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






39. 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






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






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






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






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






44. 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






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






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






47. Include reproduction and protection from predators and destructive weather






48. Forest floors contain moss and lichens






49. Affect the type of vegetation that can be supported






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