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






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






3. 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






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






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






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






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






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






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






11. 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






12. Animals that consume primary consumers (carnivores)






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






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






15. Include saprophytic organisms and organisms of decay






16. Rivers - lakes - ponds - and marshes






17. Algae - sponges - clams - snails - sea urchins - starfish - and crabs






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






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






20. Includes the community and the environment and usually all five kingdoms






21. 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






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






23. 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






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






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






26. Animals that consume green plants (herbivores)






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






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






29. The chief disruptive force






30. 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






31. Encompasses all that is external to the organism and is necessary for its existence






32. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho






33. Rock and soil surface






34. 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






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






36. Only animal life and other heterotrophic life exists






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






38. Developed long legs and many are hoofed






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






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






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






42. 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






43. 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






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






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






46. 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






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






48. Animals that eat both plants and animals






49. 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






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