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






2. 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






3. 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






4. 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






5. Animals that consume primary consumers (carnivores)






6. 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






7. 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






8. Forest floors contain moss and lichens






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






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






11. Determines water holding capacity






12. 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






13. 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






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






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






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






17. 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






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






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






20. First to resettle a virgin area






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






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






25. Symbiotic relationship from which both organisms derive some benefit






26. Deer - fox - woodchuck - and squirrel






27. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down






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






29. The study of interactions between organisms and their environment






30. Community in an ecological succession is identified by a dominant species






31. Only animal life and other heterotrophic life exists






32. 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






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






34. Affect the type of vegetation that can be supported






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






36. Regiong beneatht he photic zone that receives no light






37. The oceans






38. Crawling and sessile organsms






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






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






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






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






43. Organisms that manufacture their own food






44. Animals that eat both plants and animals






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






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






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






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






49. Lichens and moss






50. 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