Which statement about transpiration is correct?
- AOn a humid day, the water potential gradient between the intercellular air space and the external atmosphere increases to stimulate water loss by evaporation.
- BWater arriving at the spongy mesophyll cells via the symplast pathway must move by osmosis through the cell surface membrane before evaporation from the surface of the cells.
- CWater diffuses down the water potential gradient from the saturated air space through the guard cells before evaporating from the surface of the cells into the atmosphere.
- DWater moves up the xylem in the apoplast pathway and can continue on this pathway by osmosis to reach the spongy mesophyll cells before evaporating into the intercellular air space.