Explain difference in distribution of guard cells between the lower and upper monocot?

In monocots, guard cells are primarily located on the lower epidermis of leaves, which helps minimize water loss through transpiration by reducing direct exposure to sunlight and wind. In contrast, some aquatic monocots may have guard cells distributed on both upper and lower epidermises to facilitate gas exchange in submerged environments. This strategic distribution reflects adaptations to environmental conditions, with the lower guard cells serving to protect against excessive moisture loss while maintaining necessary gas exchange.