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






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






3. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active






4. Determines water holding capacity






5. The study of interactions between organisms and their environment






6. 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






7. 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






8. 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






9. Developed long legs and many are hoofed






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






11. Lichens and moss






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






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






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






15. The ultimate source of energy for all organisms






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






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






18. Adaptations for maintaining their internal osmolarity and conserving water






19. 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






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






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






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






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






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






25. 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






26. 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






27. Vegetation such as vines and eppiphytes






28. 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






29. Animals that consume primary consumers (carnivores)






30. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






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






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






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






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






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






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






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






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






39. 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






40. Links between oceans and land






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






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






43. The oceans






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






45. Conserve water actively






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






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






48. Include saprophytic organisms and organisms of decay






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






50. Animals that consume only plants or plant foods