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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. Only animal life and other heterotrophic life exists






2. Determines water holding capacity






3. Organisms that manufacture their own food






4. Lichens and moss






5. 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






6. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor






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






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






9. Conserve water actively






10. The study of interactions between organisms and their environment






11. 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






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






13. 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






14. Include saprophytic organisms and organisms of decay






15. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food






16. Animals that consume primary consumers (carnivores)






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






18. Adaptations for maintaining their internal osmolarity and conserving water






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






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






21. Animals that eat both plants and animals






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






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






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






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






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






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






28. Polar bears - musk oxen - and arctic hens






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






30. Animals that consume green plants (herbivores)






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






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






33. Links between oceans and land






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






35. Crawling and sessile organsms






36. The oceans






37. 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






38. Regiong beneatht he photic zone that receives no light






39. 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






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






41. Distinct community in a geographic region






42. Animals that consume dead animals






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






44. 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






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






46. 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






47. Rock and soil surface






48. 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






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






50. 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