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






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






3. Include reproduction and protection from predators and destructive weather






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






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






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






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






8. 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






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






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






11. Needs constant energy source and cycling of materials between the living system






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






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






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






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






16. 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






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






18. 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






19. Lichens and moss






20. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish






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






22. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down






23. 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






24. 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






25. Animals that consume primary consumers (carnivores)






26. Polar bears - musk oxen - and arctic hens






27. Symbiotic relationship from which both organisms derive some benefit






28. Forest floors contain moss and lichens






29. First to resettle a virgin area






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






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






32. One or both organisms can't survive without the other






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






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






35. 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






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






37. 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






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






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






40. Include saprophytic organisms and organisms of decay






41. 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






42. 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






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






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






45. 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






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






47. 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






48. 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






49. Animals that feed on secondary consumer






50. The ultimate source of energy for all organisms







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