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






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






3. Determines water holding capacity






4. 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






5. 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






6. Animals that consume only plants or plant foods






7. Rivers - lakes - ponds - and marshes






8. Only animal life and other heterotrophic life exists






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






10. Polar bears - musk oxen - and arctic hens






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






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






13. Deer - fox - woodchuck - and squirrel






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






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






16. The study of interactions between organisms and their environment






17. Include reproduction and protection from predators and destructive weather






18. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






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






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






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






22. When a parasite benefits at the expense of the host






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






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. 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. 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






27. 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






28. Organisms that manufacture their own food






29. Affect the type of vegetation that can be supported






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






31. Adaptations for maintaining their internal osmolarity and conserving water






32. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds






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






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






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






36. Any group of similar organisms that are capable of reproducing






37. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms






38. Developed long legs and many are hoofed






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






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






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






42. Conserve water actively






43. 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






44. 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






45. Symbiotic relationship from which both organisms derive some benefit






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






47. First to resettle a virgin area






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






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






50. 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