The stomata are closed –

🔑Key Points:
-Stomata are tiny or small openings in plant tissue that allow gases to exchange. 
-Stomata are normally found in plant leaves, but they can also be found in plant stems.
-Each stomata is composed of two bean-shaped cells called guard cells, which enclose the stomatal pore.
-The stomatal guard cells are generally much smaller in size as compared to other epidermal cells.
-Stomatal guard cells help to regulate the rate of transpiration during photosynthesis by opening and closing the stomata. 
-Sayre discovered that stomata close when the pH is low (5), and open when the pH is higher (7) and implying that high pH promotes stomatal opening.