Question

In apple type of stomata
A. Stomata are present only on the upper surface of leaf
B. Stomata are present only on the lower surface of leaf
C. Stomata are present on both surface of leaf
D. Stomata are vestigial

Answer 1

Stomata have been classified into apple or mulberry type, water lily type, potato type, oat type, and potamogeton type based on its distribution on the epidermis of the leaf. The leaves having apple type of stomata are also known as hypostomatic.

Complete answer:
-Option (A) is incorrect. Stomata are present only on the upper epidermal surface of the leaf in the case of water lily type of stomata. Hence, leaves containing this type of stomata are also known as pistomatic leaves. Plants containing this type of stomata are water lily and many aquatic plants.
-Option (B) is correct. Stomata are present only on the lower epidermal surface of the leaf in the case of apple or mulberry type of stomata. Hence, leaves containing this type of stomata are also known as hypostomatic leaves. Plants containing this type of stomata are apple, pear, walnuts, mulberry, etc.
-Option (C) is incorrect. Stomata are present on both surfaces of the leaf in the case of oat type of stomata and the leaves having this type of stomata are also known as isostatic. Plants containing this type of stomata are oats, maize, grasses, etc.
-Option (D) is incorrect. Stomata are vestigial in the case of Potamogeton type and such leaves are called astomatic. Plants containing this type of stomata are Potamogeton and submerged aquatics.
Hence, the correct option is (B).

Note:
Stomata are the structure present in the epidermis of leaves, involved in the exchange of gases and water between the plants and the atmosphere. In hypostomatic leaves, an apple type of stomata is present, indicating that the stomata are present only on the lower epidermal surface of the leaves.