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






2. 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






3. Determines water holding capacity






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






5. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






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






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






8. Crawling and sessile organsms






9. Recycle water - oxygen - and phosphorus






10. Affect the type of vegetation that can be supported






11. Deer - fox - woodchuck - and squirrel






12. 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






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






14. The chief disruptive force






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






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






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






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






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






20. The study of interactions between organisms and their environment






21. 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






22. 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






23. Lichens and moss






24. 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






25. 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






26. 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






27. The ultimate source of energy for all organisms






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






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






30. 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






31. Conserve water actively






32. 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






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






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






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






36. Organisms that manufacture their own food






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






38. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






39. Rivers - lakes - ponds - and marshes






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






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






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






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






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






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






46. Animals that consume green plants (herbivores)






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






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






49. First to resettle a virgin area






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