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






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






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






4. Animals that consume primary consumers (carnivores)






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






6. Include saprophytic organisms and organisms of decay






7. The ultimate source of energy for all organisms






8. Polar bears - musk oxen - and arctic hens






9. Distinct community in a geographic region






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






11. 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






12. Only animal life and other heterotrophic life exists






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






14. 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






15. 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






16. Lichens and moss






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






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






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






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






21. Animals that consume only plants or plant foods






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






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






24. 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






25. Rock and soil surface






26. 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






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






28. Animals that feed on secondary consumer






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






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






31. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere






32. The oceans






33. Links between oceans and land






34. Deer - fox - woodchuck - and squirrel






35. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals






36. Animals that consume green plants (herbivores)






37. Include reproduction and protection from predators and destructive weather






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






39. 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






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






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






42. 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






43. 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






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






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






46. Symbiotic relationship from which both organisms derive some benefit






47. The study of interactions between organisms and their environment






48. First to resettle a virgin area






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






50. 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