Question

Water stomata are found in
(a) Plants inhabiting the humid region
(b) Plants inhabiting the dry region
(c) All plants
(d) Plants lacking normal stomata.

Answer 1

Hint: They are modified stomata present at the upper surface of the leaves of aquatic plants and are also involved in guttation. Their main function is the exchange of gases like carbon dioxide and oxygen during photosynthesis. Since hydrophytes remain submerged it does not have any transpirational role play.

Complete answer:
Water stomata are found in plants inhabiting the humid region. A type of secretory tissue in leaves of angiosperms known as hydathodes secretes water through pores in the epidermis or margin of leaves. With the help of a vascular bundle, the hydathodes are connected to the plant vascular system.

Additional Information: In water lily, the stomata are found only on the top surface of the leaf because the underside of the leaf rests on the surface of the water and the rest of the plant or the complete plant is submerged.
Although water lily is a submerged plant it can still exchange gases through water stomata and perform the function of photosynthesis.

The aquatic plants bearing water stomata have not been threatened by drought or they do not have to close its stomata during the high temperature of the day to conserve water because these are submerged in water.

So, the correct answer is,’ plants inhibiting the humid regions’.

Note: -In hydrophytes such as water ferns, the entire plant remains submerged so they do not have stomata. The function of stomata is performed by the surface cells of the plant. The surface of these plants are capable of absorbing water, nutrients, and dissolved gases from the water.
-Only those Aquatic plants have stomata which have floating leaves or emergent leaves, But those with underwater leaves can absorb carbon dioxide directly from the water. Here, plenty of water is in the surroundings so there is no need for transpiration for cooling and also transportation water and minerals into the leaves.