Question

If the upper surface of a leaf is darker than the lower surface it is described as

• A. Isobilateral leaf
• B. Dorsiventral leaf
• C. Epistomatic leaf
• D. Hypostomatic leaf

Answer 1

The correct option is B Dorsiventral leaf

A dorsiventral organ is one that has two surfaces differing from each other in appearance and structure, as an ordinary leaf. This term has also been used as a synonym for dorsoventral organs, those that extend from a dorsal to a ventral surface. Dorsi-ventral leaves which usually orient at an angle to the main axis and held perpendicular to the direction of sunlight. An isobilateral leaf is usually vertically oriented to expose both surfaces to the sun. The leaves hang vertically to expose one face directly to the drying sun, then the other face. They have equal numbers of stomata in matching quantities and surface qualities of cuticle on both faces of the leaf. Epistomatic leaf has stomata on the upper surface only. Hypostomatic leaf having stomata on the underneath, i.e., foliar abaxial surface.

Thus, the correct answer is option B.