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






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






3. 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






4. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die






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






6. Recycle water - oxygen - and phosphorus






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






8. Rivers - lakes - ponds - and marshes






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






10. Links between oceans and land






11. Affect the type of vegetation that can be supported






12. Symbiotic relationship from which both organisms derive some benefit






13. Distinct community in a geographic region






14. Forest floors contain moss and lichens






15. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches






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






17. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho






18. Include reproduction and protection from predators and destructive weather






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






20. 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






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






22. The vegetation that becomes dominant and stable after years of evolutiionary development






23. Animals that eat both plants and animals






24. 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






25. The ultimate source of energy for all organisms






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






27. 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






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






29. Determines water holding capacity






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






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






32. Lichens and moss






33. Algae - sponges - clams - snails - sea urchins - starfish - and crabs






34. 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






35. Include saprophytic organisms and organisms of decay






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






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






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






39. Nekton and benthos - scavengers - and predators (fiercely competitive)






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






41. Food chain is not a simple linear chain but an intricate web






42. Composed of populations that are able to exist under the new conditions






43. Developed long legs and many are hoofed






44. The chief disruptive force






45. Characterized by low rainfall - although considerably more than the desert biomes receive -provide no shelter for herbivorous mammals from carnivorous predators -ex: East of the Rockies - steppes of the Ukraine - and the pampas of Argentina






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






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






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






49. 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






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