Relay Pump Hypothesis supported
Role of non-living cells in ascent of saps
Role of medullary rays and xylem parenchyma in ascent of sap
Role of cortical cells in ascent of sap
All of these
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The Relay Pump Hypothesis first tried to explain the ascent of sap. It was proposed by Godlewski. It suggests that a pumping activity is present between the medullary ray cells and xylem parenchyma cells. Hence, the correct answer is option b.