Mention type of nutrient cycling explaining it.

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

The amount of nutrients, such as carbon, nitrogen, phosphorus, calcium, etc., present in the soil at any given time is referred to as the standing state.

It varies in different kinds of ecosystems and also on a seasonal basis.

Nutrients which are never lost from the ecosystem rather they are recycled time and again indefinitely. The movement of nutrients elements through the various components of an ecosystem is called nutrient cycling.

Another name of nutrient cycling is biogeochemical cycles (bio-living organisms, geo, rocks, air, water).

Nutrient cycles are of two types: $(a)$ gaseous $(b)$ sedimentary.

The reservoir for gaseous type of nutrient cycle. (E.g., nitrogen, carbon cycle) exists in the atmosphere and for the sedimentary cycle. (E.g., sulphur and phosphorus cycle) the reservoir is located in Earth's crust.

Environmental factors e.g., soil, moisture, $\mathrm{pH}$, temperature etc., regulate the rate of release nutrients into the atmosphere.

The function of the reservoir is to meet with the deficit which occurs due to imbalance in the rate of influx and efflux.

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