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






2. The oceans






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






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






5. Symbiotic relationship from which both organisms derive some benefit






6. 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






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






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






9. 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






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






11. Links between oceans and land






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






13. Rivers - lakes - ponds - and marshes






14. The chief disruptive force






15. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include






16. Deer - fox - woodchuck - and squirrel






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






18. Distinct community in a geographic region






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






20. Animals that consume only plants or plant foods






21. Conserve water actively






22. Crawling and sessile organsms






23. Community in an ecological succession is identified by a dominant species






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






25. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying






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






27. 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






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






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






30. The study of interactions between organisms and their environment






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






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






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. Determined by the same decisive factors-temperatures and rainfall






35. Rock and soil surface






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






37. 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






38. 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






39. Developed long legs and many are hoofed






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






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






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






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






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






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






46. Regiong beneatht he photic zone that receives no light






47. 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






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






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






50. 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