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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. The chief disruptive force






2. Lichens and moss






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






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






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






6. 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






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






8. Polar bears - musk oxen - and arctic hens






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






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






11. Any group of similar organisms that are capable of reproducing






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






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






14. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat






15. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






16. Affect the type of vegetation that can be supported






17. Region typical of the open seas and can be divided into photic and aphotic zones






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






19. Animals that feed on secondary consumer






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






21. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada






22. Animals that consume only plants or plant foods






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






24. Conserve water actively






25. 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






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






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






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






29. 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






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






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






32. Recycle water - oxygen - and phosphorus






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






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






35. Only animal life and other heterotrophic life exists






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






37. The ultimate source of energy for all organisms






38. One or both organisms can't survive without the other






39. Determines water holding capacity






40. 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






41. Animals that consume green plants (herbivores)






42. 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






43. Animals that eat both plants and animals






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






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






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






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






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






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






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