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Formula of DPD for withered plant cells

State the formula of DPD for withered (or shrank) plant cells? How is that condition possible?

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Withered plant cells are such that shrank due to scarcity of water by evaporation devoid of adequate replacement. In this condition the cell membrane detaches and retracts from the cell wall. The cell wall furthermore expands in length to rouse the entrance of water making TP < 0. As DPD = SF – TP and TP is negative (< 0) its formula will be DPD = SF + |TP|.   

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