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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. 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






2. Animals that feed on secondary consumer






3. Lichens and moss






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






5. 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






6. 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






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






8. Links between oceans and land






9. Polar bears - musk oxen - and arctic hens






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. Recycle water - oxygen - and phosphorus






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






13. 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






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






15. 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






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






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






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






19. Affect the type of vegetation that can be supported






20. Only animal life and other heterotrophic life exists






21. Distinct community in a geographic region






22. 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






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






24. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures






25. 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






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






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






28. Conserve water actively






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






30. Include saprophytic organisms and organisms of decay






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






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






33. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins






34. 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






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






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






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






38. 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






39. Animals that consume primary consumers (carnivores)






40. Rock and soil surface






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






42. The chief disruptive force






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






44. Animals that eat both plants and animals






45. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores






46. Vegetation such as vines and eppiphytes






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






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






50. 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