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






2. 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






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






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






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






6. Organisms that manufacture their own food






7. Adaptations for maintaining their internal osmolarity and conserving water






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






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






10. Lichens and moss






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






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






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






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






15. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes






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






17. 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






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






19. Conserve water actively






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






21. 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






22. Forest floors contain moss and lichens






23. Animals that eat both plants and animals






24. 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






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






26. Polar bears - musk oxen - and arctic hens






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






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






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






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






31. Animals that consume only plants or plant foods






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






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






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






35. 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






36. Vegetation has evolved adaptations for water conservation such as needle shaped leaves






37. 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






38. Animals that consume primary consumers (carnivores)






39. Links between oceans and land






40. Regiong beneatht he photic zone that receives no light






41. 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






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






43. 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






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






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






46. 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






47. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition






48. Treeless - frozen plain found between the taiga lands and the northern ice sheets - very short summer and thus a very short growing season during which time the ground becomes wet and marshy






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






50. Vegetation such as vines and eppiphytes