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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. Symbiotic relationship from which both organisms derive some benefit






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






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






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






5. 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






6. 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






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






8. Polar bears - musk oxen - and arctic hens






9. Vegetation such as vines and eppiphytes






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






11. Distinct community in a geographic region






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






13. 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






14. Animals that eat both plants and animals






15. Recycle water - oxygen - and phosphorus






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






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






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






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






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






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






22. Animals that consume primary consumers (carnivores)






23. Receive less than ten inches of rain each year; the rain is concentrated within a few heavy cloudbursts -ex: Sahara in Africa and Gobi in Asia






24. 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






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






26. Organisms that manufacture their own food






27. 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






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






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






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






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






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






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






34. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe






35. The study of interactions between organisms and their environment






36. The ultimate source of energy for all organisms






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






38. 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






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






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






41. 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






42. Only animal life and other heterotrophic life exists






43. First to resettle a virgin area






44. Determines water holding capacity






45. Community in an ecological succession is identified by a dominant species






46. Developed long legs and many are hoofed






47. Affect the type of vegetation that can be supported






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






49. Rock and soil surface






50. 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







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