A researcher injects tritium-labeled water low on the stem of a plant to follow transport activity.When this tritium-labeled water is found in the sap of mature leaf phloem, it can be traced back to its injection site in the stem

Question

Quizplus · Accepted Answer

Tritium-labeled water is used to trace the movement of water within a plant. Water is primarily transported from the roots to the leaves through the xylem, not the phloem. The phloem is responsible for the transport of nutrients, particularly sugars, not water.

A Researcher Injects Tritium-Labeled Water Low on the Stem of a Plant