structure of stomata
Answers
Answer:
The structure of the stomata consists of a kidney shaped epidermal cell with an opening in the centre known as the pore. The stomata are bordered by a pair of specialised parenchyma cells known as the guard cells that are responsible for regulating the size of its opening, thus saving the plant from water loss.
Explanation:
The epidermis of leaves and green stems possess many small pores called stomata. The length and breadth of stomata is about 10-40µ and 3-10µ respectively. Mature leaves contain between 50 and 500 stomata per mm2. Stomata are made up of two guard cells, special semi-lunar or kidney-shaped living epidermal cells in the epidermis. Guard cells are attached to surrounding epidermal cells known as subsidiary cells or accessory cells. The guard cells are joined together at each end but they are free to separate to form a pore between them. The inner wall of the guard cell is thicker than the outer wall (Figure 11.14). The stoma opens to the interior into a cavity called sub-stomatal cavity which remains connected with the intercellular spaces.