(B) Xylem sap consists of water and dissolved mineral ions. The unidirectional upward movement of water and minerals from the soil to the tips of leav

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(B) Xylem sap consists of water and dissolved mineral ions. The unidirectional upward movement of water and minerals from the soil to the tips of leaves through the stem and branches of plants is known as the ascent of sap. This process is facilitated by the tracheary elements of the xylem.