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






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






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






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






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






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






7. 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






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






9. 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






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






11. Determined by the same decisive factors-temperatures and rainfall






12. Organisms that manufacture their own food






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






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






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






16. Rivers - lakes - ponds - and marshes






17. Vegetation such as vines and eppiphytes






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






19. The chief disruptive force






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






21. 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






22. 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






23. 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






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






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






26. Distinct community in a geographic region






27. Affect the type of vegetation that can be supported






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






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






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






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






32. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere






33. 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






34. 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






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






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






37. 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






38. 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






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






40. Regiong beneatht he photic zone that receives no light






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






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






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






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






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






46. Deer - fox - woodchuck - and squirrel






47. Determines water holding capacity






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






49. Animals that consume primary consumers (carnivores)






50. 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







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