There are two categories of plants with respect to flowering. Short day plants flower in response to long nights . Long day plants flower in response to short nights . During daylight, plants are performing photosynthesis at a greater rate than cellular respiration if their stomata are open. For this to occur, there must be a net input of carbon dioxide and water in the leaves.
Water enters the plant via osmosis in the roots.
It travels up the xylem to the leaves. In the leaf, water enters the air spaces as water vapour . As photosynthetic cells use water more is drawn into them, again the process is osmosis . The water passes out through the stomatal pores in this situation. In this case the process is diffusion , as water is passing down its concentration gradient.