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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. Animals that consume dead animals






2. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food






3. 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






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






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






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






7. Deer - fox - woodchuck - and squirrel






8. Animals that consume green plants (herbivores)






9. Polar bears - musk oxen - and arctic hens






10. The oceans






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






12. 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






13. Organisms that manufacture their own food






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






15. Animals that feed on secondary consumer






16. Only animal life and other heterotrophic life exists






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






18. The study of interactions between organisms and their environment






19. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria






20. Regiong beneatht he photic zone that receives no light






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






22. 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






23. Determines water holding capacity






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






25. Vegetation such as vines and eppiphytes






26. Elemental nitrogen is chemically inert and cannot be used by most organisms. Lightning and nitrogen-fixing bacteria in the roots of legumes change the nitrogen into the usable - soluble nitrates






27. Adaptations for maintaining their internal osmolarity and conserving water






28. Rock and soil surface






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






30. Conserve water actively






31. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae






32. 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






33. The ultimate source of energy for all organisms






34. Forest floors contain moss and lichens






35. 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






36. 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






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






38. Lichens and moss






39. 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






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






41. Links between oceans and land






42. 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






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






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






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






46. 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






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






48. Determine by the amount of decaying plant and animal life in the soil






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






50. Recycle water - oxygen - and phosphorus