What does plant ash represent?

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(A) When a plant tissue is burnt completely,all the carbon compounds are oxidized and released as gaseous forms like $CO_2$ and water vapor.The remain

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Mineral salts absorbed by plants.

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(A) When a plant tissue is burnt completely,all the carbon compounds are oxidized and released as gaseous forms like $CO_2$ and water vapor.The remaining material left behind is known as ash.This ash contains inorganic elements (mineral salts) like calcium,magnesium,potassium,etc.,which were absorbed by the plant from the soil.Therefore,plant ash represents the inorganic mineral content of the plant tissue.

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