during the day, when the mesophyll cells of leaves are carrying out photosynthesis and transpiration side by side, the excess water produced in photosynthesis is removed through the process of transpiration.
The relationship between photosynthesis and transpiration during day time is that the CO2 and H20 released by the cellular respiration gets utilised in photosynethis. It shows that the products of cellular respiration is the reactants of photosynthesis .
