On Nov 18, 7:53*am, harry wrote:
I can see how water gets from the roots of a plant tp the leaves
powered by evaporation and capilliary attraction.
However I don't see how sugars etc get from the leaves to the root,
tubers and fruits of a plant. This implies two way flow.
Anyone know the answers to this?

Remembering way back to school biology, a plant has two fluid
transport systems - 'Xylem up, phloem down'. Xylem takes fluid (and
thus substances in solution) from root to leaf, phloem the reverse.
Wikipedia seems to agree that what I was taught hasn't changed much:
http://en.wikipedia.org/wiki/Phloem.

Regards,
Martin.