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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. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada






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






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






5. Polar bears - musk oxen - and arctic hens






6. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






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






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






9. 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






10. The oceans






11. Only animal life and other heterotrophic life exists






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






13. 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






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






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






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






17. Symbiotic relationship from which both organisms derive some benefit






18. 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






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. 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






21. The ultimate source of energy for all organisms






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






23. 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






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






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






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






27. 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






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






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






30. Animals that feed on secondary consumer






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






32. 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






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






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






35. 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






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






37. Animals that consume green plants (herbivores)






38. Rivers - lakes - ponds - and marshes






39. 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






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






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






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






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






44. Determines water holding capacity






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






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






47. Organisms that manufacture their own food






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






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






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