Class 12 Biology Ecosystem Nutrient Cycle


The cyclic movement of the nutrients between biotic and abiotic components of the ecosystem is called nutrient cycle.

Organisms need a constant supply of nutrients to grow, reproduce and regulate various body functions.

The amount of nutrients present in the soil at any given time, is called as the standing state.

Nutrient cycling is also referred as biogeochemical cycle.

Nutrient cycles are of two types-

  • Gaseous
  • Sedimentary

Gaseous cycle is the cycling of carbon, nitrogen etc.

Sedimentary cycle is the cycling of sulphur, phosphorous etc.

The reservoir for gaseous type of nutrient exists in the atmosphere and for the sedimentary cycle the reservoir is located in Earth’s crust.

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