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PCAT Biology Ecology

Subjects : pcat, biology
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. Community in an ecological succession is identified by a dominant species






2. Animals that feed on secondary consumer






3. Animals that consume green plants (herbivores)






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






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






6. Determines water holding capacity






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






8. 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






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






10. 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






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






12. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores






13. The oceans






14. 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






15. Conserve water actively






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






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






18. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia






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






20. The ultimate source of energy for all organisms






21. 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






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






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






24. Regiong beneatht he photic zone that receives no light






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






26. 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






27. 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






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






29. Lichens and moss






30. Include saprophytic organisms and organisms of decay






31. 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






32. Animals that consume dead animals






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






34. Only animal life and other heterotrophic life exists






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






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






37. Animals that eat both plants and animals






38. 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






39. First to resettle a virgin area






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






41. Forest floors contain moss and lichens






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






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






44. The chief disruptive force






45. Vegetation such as vines and eppiphytes






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






47. 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






48. 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






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






50. 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






Can you answer 50 questions in 15 minutes?



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