Sucrose moves into sieve tube elements by

Glucose produced by photosynthesis is converted into sucrose,then moved into the companion cells and then into the living phloem sieve tube cells by........

Bidirectional translocation of minerals takes place in

Marshall and Wardlaw proposed the theory of

Movement of substances in xylem is unidirectional, while in phloem it is bidirectional. Explain.

The radio-labelled carbon in carbon dioxide supplied to potato plants in an experiment was eventually seen in the tuber. Trace the movement of the labelled carbon dioxide.