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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. Adaptations for maintaining their internal osmolarity and conserving water






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






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






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






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






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






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






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






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






10. The oceans






11. Distinct community in a geographic region






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






13. Determines water holding capacity






14. 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






15. Affect the type of vegetation that can be supported






16. 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






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






18. The ultimate source of energy for all organisms






19. 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






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






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






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






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






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






25. Animals that consume only plants or plant foods






26. 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






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






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






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






30. Links between oceans and land






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






32. 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






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






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






35. 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






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






37. 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






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






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






40. 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






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






42. Animals that consume green plants (herbivores)






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






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






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






46. 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






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






48. 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






49. The chief disruptive force






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