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






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






3. 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






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






5. 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






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






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






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






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






10. 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






11. Animals that consume green plants (herbivores)






12. 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






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






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






15. 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






16. Animals that consume dead animals






17. Rivers - lakes - ponds - and marshes






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






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






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






21. 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






22. Polar bears - musk oxen - and arctic hens






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






24. Developed long legs and many are hoofed






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






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






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






28. Links between oceans and land






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






30. 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






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






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






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






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






35. Algae - crabs - crustacea - and many different species of fish






36. Deer - fox - woodchuck - and squirrel






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






38. First to resettle a virgin area






39. The oceans






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






41. 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






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






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






44. 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






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






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






47. Distinct community in a geographic region






48. 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






49. Regiong beneatht he photic zone that receives no light






50. Conserve water actively