ECOLOGY QUESTION 1983:			L. PETERSON/AP BIOLOGY

	Describe the trophic levels in a typical ecosystem. Discuss the flow of 
	energy through the ecosystem, the relationship between the different 
	trophic levels, and the factors that limit the number of trophic levels.  
 


  STANDARDS:
  DESCRIPTION AND SYSTEM RELATIONSHIPS:           Max. = 8 points
  Define and/or identify:
  __  producers
  __  consumers (herbivores - carnivores - omnivores)
  __  decomposers
  Identification of:
  __  autotrophs
  __  heterotrophs
  Define:
  __  trophic level
  __ Complex system
  Comparisons (Pyramids):
  __  organism (numbers)
  __  organism (size)
  __  organism (biomass)
  __  inverted, numbers and/or biomass
  
  __  Material Cycling
  __  Description of food chain and/or web
  
  ENERGY FLOW IN THE SYSTEM:                      Max. = 6 points
  __  source
  __  process (photosynthesis)
  __  producers support the system
  __  energy loss
  __  quantification of loss
  Use of Energy:
  __  heat
  __  metabolic
  __  building compounds
  __  amount of energy contained (comparative)
  Relationship of R:
  __  Prnet
  __  Prgross
  
  LIMITING FACTORS:    (No Max.)
  __  Energy (2 points)
  __  Change in Prnet
  __  Change in Prgross
  __  Biomass (materials)
  __  Producer numbers
  __  Efficiency