Question

Unlike most of the terrestrial plants, the water hyacinth has stomata on both surfaces, not just on the underside. Explain why?
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Answer 1

Answer:

stomata​ are porelike openings that allow for gas exchange on leaf surfaces. In some aquatic plants, the lower part of the leaves floats on the surface of the water, so there are no stomata on this side. The stomata are located only on the upper part of leaves in aquatic species like water lily (​Nymphaea​ spp.). Other aquatic plant species, like seagrass, do not have stomata. In place of stomata, seagrasses have a thin cuticle layer on their leaves that allows for gas exchange through the entire outer surfaces of the leaves, which are completely submerged in water.

Explanation:

Answer 2

Answer:

Aquatic plants float on the surface of the water and therefore stomata are not organized in the lower epidermis. Stomata are established on the upper epidermis due to the direct trade of gases between the leaf and the atmosphere.