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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. Distinct community in a geographic region






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






3. Deer - fox - woodchuck - and squirrel






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






5. 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






6. Conserve water actively






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






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






9. 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






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






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






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






13. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms






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






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






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






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






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






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






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






21. 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






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






23. 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






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






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






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






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






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






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






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






31. 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






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






33. 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






34. 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






35. 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






36. 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






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






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






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






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






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






42. Regiong beneatht he photic zone that receives no light






43. Receive less than ten inches of rain each year; the rain is concentrated within a few heavy cloudbursts -ex: Sahara in Africa and Gobi in Asia






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






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






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






47. 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






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






49. Symbiotic relationship from which both organisms derive some benefit






50. The oceans