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






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






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






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






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






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






7. 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






8. Regiong beneatht he photic zone that receives no light






9. Conserve water actively






10. Include reproduction and protection from predators and destructive weather






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






12. 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






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






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






15. Determines water holding capacity






16. Rivers - lakes - ponds - and marshes






17. 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






18. 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






19. Deer - fox - woodchuck - and squirrel






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






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






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






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






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






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






26. 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






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






28. Animals that eat both plants and animals






29. Distinct community in a geographic region






30. Rock and soil surface






31. Only animal life and other heterotrophic life exists






32. The chief disruptive force






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






34. 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






35. Vegetation such as vines and eppiphytes






36. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae






37. Animals that consume green plants (herbivores)






38. Polar bears - musk oxen - and arctic hens






39. 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






40. 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






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






42. Lichens and moss






43. The ultimate source of energy for all organisms






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






45. 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






46. Crawling and sessile organsms






47. Include saprophytic organisms and organisms of decay






48. 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






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






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