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






3. Developed long legs and many are hoofed






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






5. Frozen area with no vegetation and terrestrial animals -animals that do inhabit polar regions generally live near the polar oceans






6. Polar bears - musk oxen - and arctic hens






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






8. Lichens and moss






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






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






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






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






13. Without a constant input of energy from the sun - an ecosystem would soon run down - as food is transferred from one level of the food chain to the next - a transfer of energy occurs






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






15. Include reproduction and protection from predators and destructive weather






16. Conserve water actively






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






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






19. 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






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






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






22. 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






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






24. Forest floors contain moss and lichens






25. 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






26. Organisms that manufacture their own food






27. Include saprophytic organisms and organisms of decay






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






29. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat






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






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






32. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms






33. Animals that consume green plants (herbivores)






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






36. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place






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






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






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






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






41. Rock and soil surface






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






43. 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






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






45. 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






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






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






48. Vegetation such as vines and eppiphytes






49. Distinct community in a geographic region






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







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