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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. 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






2. 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






3. 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






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






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






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






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






8. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition






9. The study of interactions between organisms and their environment






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






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






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






13. The oceans






14. Animals that consume only plants or plant foods






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






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






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






18. Rock and soil surface






19. One that exerts control over the other species that are present






20. 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






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






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






23. 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






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






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






26. 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






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






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






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






30. The chief disruptive force






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






32. Vegetation such as vines and eppiphytes






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






34. 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






35. Conserve water actively






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






37. 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






38. Animals that feed on secondary consumer






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






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






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






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






43. Lichens and moss






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






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






46. Animals that eat both plants and animals






47. Include reproduction and protection from predators and destructive weather






48. When a parasite benefits at the expense of the host






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






50. First to resettle a virgin area







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