The formula commonly associated with stomata describes the Stomatal Index (I), which represents the proportion of stomata relative to the total number of epidermal cells. The formula is:
I = S / (E + S)
Where:
- I = Stomatal Index
- S = Number of stomata cells per unit area
- E = Number of epidermal cells per unit area
This formula is useful in plant anatomy and physiology for understanding the density and distribution of stomata on plant surfaces, which plays a crucial role in gas exchange and transpiration. Stomata themselves are not a compound with a chemical formula. Rather, they are biological structures.