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






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






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






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






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






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






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






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






9. Include saprophytic organisms and organisms of decay






10. Organisms that manufacture their own food






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






12. Conserve water actively






13. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins






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






15. 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






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






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






18. Animals that feed on secondary consumer






19. 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






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






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






22. 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






23. First to resettle a virgin area






24. The ultimate source of energy for all organisms






25. Distinct community in a geographic region






26. Affect the type of vegetation that can be supported






27. 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






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






30. Include reproduction and protection from predators and destructive weather






31. Animals that consume green plants (herbivores)






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






33. 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






34. 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






35. Rivers - lakes - ponds - and marshes






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






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






38. 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






39. Only animal life and other heterotrophic life exists






40. Polar bears - musk oxen - and arctic hens






41. Adaptations for maintaining their internal osmolarity and conserving water






42. The chief disruptive force






43. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






44. 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






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






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






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






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






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






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







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