According to capillarity theory, . . . . . . | vedclass

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(D) The capillarity theory,proposed by $Bohm$ $(1863)$,suggests that the ascent of sap in plants is primarily due to the physical forces of cohesion,a

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physical forces and dead cells

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(D) The capillarity theory,proposed by $Bohm$ $(1863)$,suggests that the ascent of sap in plants is primarily due to the physical forces of cohesion,adhesion,and surface tension acting within the narrow xylem vessels,which act like capillaries. According to this theory,these physical forces and the presence of dead cells (xylem tracheids and vessels) are sufficient to cause the ascent of sap. It does not rely on transpiration pull or osmotic pressure as the primary driving force.

According to capillarity theory, . . . . . . alone causes ascent of sap in plants.

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