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






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






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






5. Adaptations for maintaining their internal osmolarity and conserving water






6. Sunlit layer of the open sea extending to a depth of 250-600ft






7. The chief disruptive force






8. Lichens and moss






9. Animals that eat both plants and animals






10. First to resettle a virgin area






11. Recycle water - oxygen - and phosphorus






12. Crawling and sessile organsms






13. Developed long legs and many are hoofed






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






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






16. Deer - fox - woodchuck - and squirrel






17. 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






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






19. Polar bears - musk oxen - and arctic hens






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






21. Conserve water actively






22. Animals that feed on secondary consumer






23. Regiong beneatht he photic zone that receives no light






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






25. Rock and soil surface






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






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






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






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






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






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






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






34. 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






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






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






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






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






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






40. Distinct community in a geographic region






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






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






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






44. 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






45. Animals that consume green plants (herbivores)






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






47. Composed of populations that are able to exist under the new conditions






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






49. 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






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