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






2. Adaptations for maintaining their internal osmolarity and conserving water






3. 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






4. Animals that consume primary consumers (carnivores)






5. Animals that consume only plants or plant foods






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






7. Animals that consume dead animals






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






9. Include saprophytic organisms and organisms of decay






10. Recycle water - oxygen - and phosphorus






11. 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






12. 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






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






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






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






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






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






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






19. Region typical of the open seas and can be divided into photic and aphotic zones






20. First to resettle a virgin area






21. Rivers - lakes - ponds - and marshes






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






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






24. Distinct community in a geographic region






25. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat






26. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches






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






28. Affect the type of vegetation that can be supported






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






31. One that exerts control over the other species that are present






32. Symbiotic relationship from which both organisms derive some benefit






33. 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






34. Animals that eat both plants and animals






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






36. 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






37. Links between oceans and land






38. 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






39. 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






40. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by






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






42. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels






43. 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






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






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






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






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






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






49. Polar bears - musk oxen - and arctic hens






50. Animals that feed on secondary consumer






Can you answer 50 questions in 15 minutes?



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