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5 Written Questions

5 Matching Questions

  1. Pyramid of energy flow
  2. Anaerobic respiration
  3. Nitrogen cycle
  4. Natural greenhouse effect
  5. Net Primary Productivity (NPP)
  1. a The recycling of nitrogen in the environment in which nitrogen goes from a gas, to organic compounds in the soil, to proteins in a plant or nitrates, and then is again released into the atmosphere as a gas.
  2. b Rate at which all the plants in an ecosystem produce net useful chemical energy; equal to the difference between the rate at which the plants in an ecosystem produce useful chemical energy (gross primary productivity) and the rate at which they use some of that energy through cellular respiration. Compare gross primary productivity.
  3. c Heat buildup in the troposphere because of the presence of certain gases, called greenhouse gases. Without this effect, the earth would be nearly as cold as Mars, and life as we know it could not exist. Compare global warming.
  4. d Diagram representing the flow of energy through each trophic level in a food chain or food web. With each energy transfer, only a small part (typically 10%) of the usable energy entering one trophic level is transferred to the organisms at the next trophic level. Compare pyramid of biomass, pyramid of numbers.
  5. e The use of inorganic molecules other than oxygen to accept electrons at the "downhill" end of electron transport chains.

5 Multiple Choice Questions

  1. Continuous movement of water on, above and below the surface of the Earth.
  2. Series of steps in an ecosystem in which organisms transfer energy by eating and being eaten.
  3. A group of individuals of the same species that live together in the same area at the same time
  4. Cyclic movement of phosphorus in different chemical forms from the environment to organisms and then back to the environment
  5. Organisms that eat living producers and/or other consumers for food

5 True/False Questions

  1. OrganismsAll the organisms that inhabit a particular area; an assemblage of populations of different species living close enough together for potential interaction.


  2. BiosphereThe entire portion of Earth inhabited by life; the sum of all the planet's ecosystems.


  3. ProducersOrganisms that eat living producers and/or other consumers for food


  4. Nutrient (biogeochemical) cyclesThe pathways by which chemicals circulate through ecosystems that involve both living (biotic) and nonliving (geological) components.


  5. EcosystemsAll the organisms in a given area as well as the abiotic factors with which they interact; a community and its physical environment


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