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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. Animals that consume dead animals






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






3. 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






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






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






6. Organisms that manufacture their own food






7. 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






8. 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






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






10. 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






11. Animals that consume primary consumers (carnivores)






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






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






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






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






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






17. Recycle water - oxygen - and phosphorus






18. The study of interactions between organisms and their environment






19. Include reproduction and protection from predators and destructive weather






20. Lichens and moss






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






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






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






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






25. 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






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






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






28. Distinct community in a geographic region






29. 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






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






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






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






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






34. 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






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






36. Free-living organisms that feed on other living organisms






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






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






39. Forest floors contain moss and lichens






40. 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






41. Links between oceans and land






42. Adaptations for maintaining their internal osmolarity and conserving water






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






44. Two fates await the ammonia (NH3). some are nitrified or dentrified






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






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






47. Rivers - lakes - ponds - and marshes






48. Animals that eat both plants and animals






49. 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






50. Animals that feed on secondary consumer