The plant ash is an indication of

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(C) When a plant part is burnt,the organic matter (carbon,hydrogen,oxygen,nitrogen) is oxidized and released as gases like $CO_2$,$H_2O$ vapor,and $NO

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Mineral salts absorbed by plants

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(C) When a plant part is burnt,the organic matter (carbon,hydrogen,oxygen,nitrogen) is oxidized and released as gases like $CO_2$,$H_2O$ vapor,and $NO_x$. The remaining residue is known as plant ash. This ash consists of inorganic mineral elements that were absorbed by the plant from the soil during its growth. Therefore,plant ash is an indication of the mineral salts absorbed by the plants.

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The plant ash indicates:

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