Here's why:
* Stomata are tiny pores on the surface of leaves and stems.
* They are surrounded by two guard cells, which are specialized cells that control the opening and closing of the stoma.
* When guard cells take in water, they swell and open the stoma, allowing for gas exchange (carbon dioxide in, oxygen out).
* When guard cells lose water, they shrink and close the stoma, preventing excessive water loss.
This opening and closing is essential for:
* Photosynthesis: Stomata allow the plant to take in carbon dioxide needed for photosynthesis.
* Transpiration: Stomata also allow water vapor to escape, which helps cool the plant and move water from roots to leaves.
Let me know if you have any other questions!
