What are stomata in biology. Where are they located in plants. How do they open & close. What do they do. Learn their significance & purpose, along with diagrams . The stomata are minute pores which occur in the epidermis of the plants. Each stoma remains surrounded by two kidneys or bean shaped epidermal cells the guard cells. Listed below are the different types of stomata . The diagram of the Stomata is useful for both classes 10 and 12. It is one of the few important topics and is majorly asked in the board examinations. A brief description of the Stomata along with a well-labelled diagram is given below for reference. The diagram of stomata shows how different parts of the stomata work together to help plants breathe and save water. Stomata are tiny openings on the surface of leaves that open and close as needed.