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






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






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






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






5. 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






6. Developed long legs and many are hoofed






7. 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






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






9. Rock and soil surface






10. First to resettle a virgin area






11. 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






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






13. Animals that consume dead animals






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






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






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






17. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor






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






19. 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






20. Determines water holding capacity






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






22. Affect the type of vegetation that can be supported






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






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






25. Lichens and moss






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






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






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






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






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






31. Organisms that manufacture their own food






32. 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






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






34. The chief disruptive force






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






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






37. Forest floors contain moss and lichens






38. Vegetation such as vines and eppiphytes






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






40. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






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






42. 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






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






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






45. 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






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






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






48. One species may be competitively superior to the other and drive the second to extinction






49. Include saprophytic organisms and organisms of decay






50. Algae - sponges - clams - snails - sea urchins - starfish - and crabs







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