Name the cells that surround a stomatal pore.
A. Palisade parenchyma
B. Spongy parenchyma
C. Guard cells
D. Mesophyll

Hint: In reaction to the internal pressure of two bean-shaped cells that envelope stomata which help in opens and shuts. They allow for the exchanging of gases inside the leaf between the exterior air and the branched air duct interconnecting mechanism. Another inhibitor of stomatal opening in several plants is carbon dioxide accumulation in the air.

Complete answer:
Stomata are the microscopic holes or pores of the leaves or young stems of the epidermis. Stomata on the underside of leaves are usually more frequent.
-Guard cells are cells that each stoma is surrounded by. By locking and unlocking the stomata, they said control the rate of transpiration. Thus, option A is not the correct option.
-Guard cells are specialized cells which are used to regulate gas exchange in the epidermis of the stems, leaves as well as other organs. Thus, option B is not the correct option.
-The guard cells are formed in pairs with a gap that creates a stomatal pore between them. The stomatal pores are greatest when water is easily accessible, and when the water supply is critically poor and the guard cells are flaccid, the guard cells become turgid or closed.
-The opening and closing of the stomatal pore is mediated by changes in the two guard cells' turgor strain. Movements of vast amounts of ions and sugars in and out of the guard cells regulate the turgor pressure of guard cells. Thus, option D is not the correct option.

Hence, the correct answer is option (C).

Note: Plants must offset the amount of carbon dioxide consumed from the environment with the lack of water through the stomatal pores, which is done by active and passive regulation of the turgor of the guard cell and the size of the stomatal pore. When leaves are moved from darkness to light, stomata typically open. Fortunately, the reverse-phase stomatal opening has been recognized in succulent plants.