Plant ash is an indication of:

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(C) When dried plant parts are heated in a silica crucible at approximately $600^{\circ}C$,all organic substances are oxidized and vaporized.The remai

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Only mineral salts

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(C) When dried plant parts are heated in a silica crucible at approximately $600^{\circ}C$,all organic substances are oxidized and vaporized.The remaining residue,known as plant ash,contains only inorganic mineral elements that were absorbed by the plant from the soil.Therefore,plant ash serves as an indicator of the mineral content present in the plant tissue.

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