Abundance and Distribution of Organisms Within a Habitiat

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Energy Flow Through the Ecosystem

Energy source - 

  • Ultimate source for most ecosystems is the sun - energy is released in the form of electromagnetic waves (other than chemosynthesis).
  • Lot sof energy reaches the atmosphere but does not penetrate it - is reflected or absorbed instead.
  • 90% reaching surface of earth is reflected or absorbed as heat.
  • Only 10% is used by plants, 1-5% is utilised, the rest is lost - by reflection or water loss.

Food Chains and Food Webs

  • Autotrophes are the source of food for heterotrophes
  • Energy is transferred through a sequence of organisms - food chain
  • Each stage is called a trophic level

1 - Grazing Food Chain

  • 1st trophic level - primary producers…

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