Ecosystem YouTube Lecture Handout

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Ecosystem YouTube Lecture Handout


  • Definition
  • Components of ecosystem
  • Classification of ecosystem
  • Ecosystem functions
  • Importance


  • Functional unit of nature with the surrounding physical environment.
  • Varies greatly in size
  • Encompasses specific and limited species
  • Species dependent on the other species and elements that are also part of ecological community
  • Living organisms + Non Living objects


Components of Ecosystem: BIotic and Abiotic


Classification of Ecosystem: Natural and Aritificial

Ecosystem Functions

  • Energy enters as light energy, or photons, is transformed into chemical energy in organic molecules by photosynthesis.
  • Energy is dissipated
  • Plants obtain elements from the surrounding atmosphere, water, or soils.
  • Animals obtain elements from other organisms.
  • Due to excretion or decomposition, elements returned to an inorganic state.
  • Materials are not destroyed or lost- closed system with respect to elements
Four Main Functions of Ecosystem

Importance of Study of Ecosystem

  • Indicates available solar energy
  • Gives information about minerals
  • Inter-relationship of organism
  • To know about conservation of resources, GPP and NPP
  • Biological Survey, Crop rotation