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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. The oceans






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






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






4. Forest floors contain moss and lichens






5. Animals that eat both plants and animals






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






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






8. Crawling and sessile organsms






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






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






11. 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






12. Animals that feed on secondary consumer






13. 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






14. The chief disruptive force






15. Organisms that manufacture their own food






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






17. Polar bears - musk oxen - and arctic hens






18. 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






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






20. 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






21. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






22. Determines the nature of plant and animal life in the soil






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






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






26. First to resettle a virgin area






27. Recycle water - oxygen - and phosphorus






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






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






30. Animals that consume only plants or plant foods






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






32. Animals that consume green plants (herbivores)






33. 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






34. Regiong beneatht he photic zone that receives no light






35. 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






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






37. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches






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






39. Lichens and moss






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






41. Distinct community in a geographic region






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






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






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






45. 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






46. Include saprophytic organisms and organisms of decay






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






48. 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






49. Deer - fox - woodchuck - and squirrel






50. Links between oceans and land







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