Question

How does ascent of sap occur in plants?

Answer 1

In plants, water absorbed by the root hair is transported upwards from the root, then through the stem and finally to the leaves by the xylem. Most of the water is released from the leaves as water vapours by the process of transpiration. This causes more water to rise up in the stem, which also carries nutrients with it. The water-containing nutrients is known as sap and the rising of sap is known as ascent of sap.