why do plants transpire?Watch
what would i need to include to get full marks?
Perhaps the answer would be along the lines of needing to maintain a water potential gradient in the plant since the evaporation of water from the leaves creates a lower water potential when compared to the top of the xylem. That would cause water to diffuse into the leaves by osmosis due to the gradient produced; thereby allowing a constant uptake of water be maintained in the plant. In doing so, the water can act as a transport medium within the plant, when transporting sucrose for instance, to allow for the movement of material.
Just some ideas to think about