ylem and phloem The two structures that IImit transpiration are known os Guard cells and xylem square square stomoto and

The correct answer is: Guard cells and stomata.<br /><br />Guard cells and stomata are the two structures involved in transpiration. Guard cells are specialized cells that surround the stomata, which are small openings on the surface of leaves. These cells regulate the opening and closing of the stomata, controlling the rate of transpiration. When the guard cells are turgid (filled with water), the stomata are open, allowing water vapor to escape from the leaf. When the guard cells are flaccid (lacking water), the stomata are closed, reducing water loss. This process helps regulate the plant's water balance and maintain its overall health.