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






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






3. 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






4. First to resettle a virgin area






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






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






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






8. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by






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






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






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






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






13. 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






14. Determines water holding capacity






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






16. Developed long legs and many are hoofed






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






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






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






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






21. Animals that feed on secondary consumer






22. Include saprophytic organisms and organisms of decay






23. 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






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






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






26. Distinct community in a geographic region






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






28. 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






29. Lichens and moss






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






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






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






33. Animals that consume green plants (herbivores)






34. 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






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






36. 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






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






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






39. 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






40. Deer - fox - woodchuck - and squirrel






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






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






43. Vegetation such as vines and eppiphytes






44. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia






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






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






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






48. Conserve water actively






49. Affect the type of vegetation that can be supported






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