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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. Rock and soil surface






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






3. 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






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






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






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






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






8. Animals that consume only plants or plant foods






9. Adaptations for maintaining their internal osmolarity and conserving water






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






11. 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






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






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






14. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






15. Animals that consume green plants (herbivores)






16. Determines water holding capacity






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






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






19. The oceans






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






21. 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






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






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






24. 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






25. Polar bears - musk oxen - and arctic hens






26. The chief disruptive force






27. Two fates await the ammonia (NH3). some are nitrified or dentrified






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






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






30. 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






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






32. Lichens and moss






33. 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






34. Only animal life and other heterotrophic life exists






35. Organisms that manufacture their own food






36. Developed long legs and many are hoofed






37. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes






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






39. Recycle water - oxygen - and phosphorus






40. 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






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






42. Include reproduction and protection from predators and destructive weather






43. 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






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






45. Conserve water actively






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






47. Animals that consume dead animals






48. Forest floors contain moss and lichens






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






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







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