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






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






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






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






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






6. 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






7. Crawling and sessile organsms






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






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






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






11. First to resettle a virgin area






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






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






14. 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






15. Adaptations for maintaining their internal osmolarity and conserving water






16. Polar bears - musk oxen - and arctic hens






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






18. Rivers - lakes - ponds - and marshes






19. 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






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






21. Animals that eat both plants and animals






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






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






24. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat






25. Distinct community in a geographic region






26. 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






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






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






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






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






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






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






33. 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






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






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






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






37. Vegetation such as vines and eppiphytes






38. Rhododendrons and pines are more suited for growth in acid oil






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






40. Conserve water actively






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






42. Animals that consume only plants or plant foods






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






44. Determines water holding capacity






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






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






47. Deer - fox - woodchuck - and squirrel






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






49. Animals that consume dead animals






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