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(A) The Pulsation Theory of ascent of sap was proposed by Sir $J. C. Bose$ in $1923$. According to this theory,the living cells of the innermost layer

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$J$. $C$. Bose

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(A) The Pulsation Theory of ascent of sap was proposed by Sir $J. C. Bose$ in $1923$. According to this theory,the living cells of the innermost layer of the cortex,which is the endodermis,exhibit rhythmic pulsations. These pulsations create a pumping action that helps in the upward movement of water (ascent of sap) through the xylem vessels. This is considered a vital force theory because it relies on the metabolic activity of living cells.

According to one vital force theory,the ascent of sap is due to the active pulsation of the innermost layer of the cortex. This theory was proposed by:

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