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






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






3. Regiong beneatht he photic zone that receives no light






4. 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






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






6. Affect the type of vegetation that can be supported






7. The ultimate source of energy for all organisms






8. 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






9. 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






10. 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






11. 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






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






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






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






15. Distinct community in a geographic region






16. Developed long legs and many are hoofed






17. 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






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






19. The chief disruptive force






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






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






22. 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






23. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria






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






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






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






27. Receive less than ten inches of rain each year; the rain is concentrated within a few heavy cloudbursts -ex: Sahara in Africa and Gobi in Asia






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






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






30. Symbiotic relationship from which both organisms derive some benefit






31. 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






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






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






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






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






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






37. Animals that consume green plants (herbivores)






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






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






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






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






42. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






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






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






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






46. 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






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






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






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






50. Animals that consume only plants or plant foods