energy transfer

• What is the trophic level of a plant?

  • producer
• Why is energy lost between each trophic level?

  • Respiration and excretion, the remaining is the biomass
• what is the dry biomass of an organism?

  • The mass of an organism after all water has been removed
• What is GPP?

  • Gross primary production is, the total energy produced from photosynthesis in a given area and time
• What is NPP?

  • Net primary production is, the total energy produced form photosynthesis minus energy lost from respiration
  • NPP = GPP - R
• What is the net production of consumers?

  • N= net production
  • I= Energy in ingested food
  • F= energy lost in faeces and urine etc
  • R= respiratory losses
  • N= I-(F+R)
• What are the units for rates of productivity?

  • KjHa-1year-1
  • kj is energy
  • Ha is unit area to show different environments have different impacts
  • years is to account for the impact of seasons