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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. Include saprophytic organisms and organisms of decay






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






3. Without a constant input of energy from the sun - an ecosystem would soon run down - as food is transferred from one level of the food chain to the next - a transfer of energy occurs






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






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






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






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






8. 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






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






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






11. 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






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






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






14. Rivers - lakes - ponds - and marshes






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






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






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






18. Polar bears - musk oxen - and arctic hens






19. Only animal life and other heterotrophic life exists






20. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes






21. The major component of the internal environment of all living things






22. 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






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






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






25. 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






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






27. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food






28. The oceans






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






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






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






32. 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






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






34. 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






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






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






37. Conserve water actively






38. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






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






40. Lichens and moss






41. Rock and soil surface






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






43. Include reproduction and protection from predators and destructive weather






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






45. 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






46. Vegetation such as vines and eppiphytes






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






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






49. Adaptations for maintaining their internal osmolarity and conserving water






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