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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. Recycle water - oxygen - and phosphorus






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






3. 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






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






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






6. The nitrogen locked up in the wastes and dead tissues is released by the action of the bacteria of decay - which convert the proteins into ammonia






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






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






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






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






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






12. 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






13. Symbiotic relationship from which both organisms derive some benefit






14. The chief disruptive force






15. 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






16. 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






17. Adaptations for maintaining their internal osmolarity and conserving water






18. Animals that eat both plants and animals






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






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






21. Include saprophytic organisms and organisms of decay






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






23. Animals that feed on secondary consumer






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






25. The study of interactions between organisms and their environment






26. 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






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






28. Rock and soil surface






29. The oceans






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






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






32. 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






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






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






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






36. Forest floors contain moss and lichens






37. Distinct community in a geographic region






38. Links between oceans and land






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






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






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






42. Vegetation such as vines and eppiphytes






43. The ultimate source of energy for all organisms






44. One or both organisms can't survive without the other






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






46. Only animal life and other heterotrophic life exists






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






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






49. 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






50. 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