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






2. Affect the type of vegetation that can be supported






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






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






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






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






7. 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






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






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






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






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






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






13. 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






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






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






16. Rivers - lakes - ponds - and marshes






17. Developed long legs and many are hoofed






18. 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






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






20. Animals that feed on secondary consumer






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






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






23. 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






24. Conserve water actively






25. 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






26. One species may be competitively superior in some regions - and the other may be superior in other regions under different environmental conditions. this would result in the elimination of one species in some places and the other in other places






27. 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






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






29. Recycle water - oxygen - and phosphorus






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






31. Links between oceans and land






32. Rhododendrons and pines are more suited for growth in acid oil






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






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






35. Distinct community in a geographic region






36. 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






37. 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






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






39. Animals that consume primary consumers (carnivores)






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






41. Animals that consume only plants or plant foods






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






43. Animals that eat both plants and animals






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






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






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






47. 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






48. 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






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






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