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






2. Affect the type of vegetation that can be supported






3. Symbiotic relationship from which both organisms derive some benefit






4. Rock and soil surface






5. Only animal life and other heterotrophic life exists






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






7. Developed long legs and many are hoofed






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






9. 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






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






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






12. First to resettle a virgin area






13. Recycle water - oxygen - and phosphorus






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






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






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






17. Group of organisms of the same species living together in a given location






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






19. Nekton and benthos - scavengers - and predators (fiercely competitive)






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






21. Animals that consume primary consumers (carnivores)






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






23. The metabolically produced CO2 is released to the air. The rest of the orgnaic carbon remains locked whthin an organism until its death (except for wastes given off) - at which time decay processes by bacteria return the CO2 to the air






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






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






26. Include saprophytic organisms and organisms of decay






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






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






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






30. Animals that consume dead animals






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






32. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere






33. 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






34. Organisms that manufacture their own food






35. Receive less than ten inches of rain each year; the rain is concentrated within a few heavy cloudbursts -ex: Sahara in Africa and Gobi in Asia






36. The ultimate source of energy for all organisms






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






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






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






40. Determine by the amount of decaying plant and animal life in the soil






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






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






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






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






45. Lichens and moss






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






47. Rivers - lakes - ponds - and marshes






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






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






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