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






2. 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






3. Polar bears - musk oxen - and arctic hens






4. The study of interactions between organisms and their environment






5. Symbiotic relationship from which both organisms derive some benefit






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






7. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures






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






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






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






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






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






13. 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






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






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






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






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






18. Distinct community in a geographic region






19. First to resettle a virgin area






20. Each member of a food chain uses some of the energy it obtains from its food for its own metabolism and loses some additional energy in the form of heat






21. Affect the type of vegetation that can be supported






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






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






24. Organisms that manufacture their own food






25. 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






26. Rock and soil surface






27. Deer - fox - woodchuck - and squirrel






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






29. 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






30. 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






31. 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






32. The chief disruptive force






33. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat






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






35. 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






36. 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






37. 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






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






39. Conserve water actively






40. Include reproduction and protection from predators and destructive weather






41. 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






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






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






44. 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






45. The ultimate source of energy for all organisms






46. 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






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






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






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






50. Lichens and moss