Question

In transport in plants, describe transpiration

Answer 1

Due to transpiration from leaves ,a great water deficit takes place in its cells.As a result of this deficit,the water is drawn osmotically from the xylem cells in leaf viens ,and by the cells surrounding the veins .Thus a sort of pull is produced in the uppermost xylem cells in the leaves .It is called the transpirational pull.
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Answer 2

Transportation is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. Transpiration is essentially evaporation of water from plant leaves. Transpiration also includes a process called guttation, which is loss of water in liquid form from the uninjured leaf or stem of the plant, principally through water stomata.