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at nights, plants close their stomata and do not photosynthesize or transpire. nonetheless, there are still...

at nights, plants close their stomata and do not photosynthesize or transpire. nonetheless, there are still sucrose sources and sinks in the plant body and bulk flow of phloem sap occurs. under such conditions, explain what happens to water in the xylem ?
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Answer :- Sucrose is actively transported from source cells into companion cells and then into the sieve-tube elements. This reduces the water potential, which causes water to enter the phloem from the xylem. The resulting positive pressure forces the sucrose-water mixture down toward the roots, where sucrose is unloaded. Transpiration causes water to return to the leaves through the xylem vessel.

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