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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. 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






2. Rivers - lakes - ponds - and marshes






3. Regiong beneatht he photic zone that receives no light






4. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying






5. Only animal life and other heterotrophic life exists






6. The chief disruptive force






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






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






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






10. 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






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






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






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






14. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment






15. 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






16. 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






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






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






19. Animals that consume dead animals






20. 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






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






22. Animals that feed on secondary consumer






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






24. Animals that eat both plants and animals






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






26. Developed long legs and many are hoofed






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






28. Conserve water actively






29. Links between oceans and land






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






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






32. Animals that consume only plants or plant foods






33. Include saprophytic organisms and organisms of decay






34. 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






35. When one organism is benefited by the association and the other is not affected






36. 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






37. 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






38. Include reproduction and protection from predators and destructive weather






39. 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






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






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






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






43. Vegetation such as vines and eppiphytes






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






45. Lichens and moss






46. 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






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






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






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






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







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