Question

A woody stemwas girdled by removing a ring of bark, leaving the xylem intact. a bulge develps above the girlde in a few weeks in stem a but not in the stem b why

Answer 1

it's because the food is always prepared in leaves and then it is sent to the roots . since phloem carry food bulge devolops above the girdle by not below.

brief reason is as food is always transported downwards