Question

Stomata are distributed more on the lower surface than on the upper surface in

• A. Equifacial leaf
• B. Bifacial leaf
• C. Unifacial leaf
• D. Both A and B
  

Answer 1

Answer: (B)

Bifacial leaf

A. Equifacial- The leaf which is placed in such a way that both the surfaces of the leaf receive an equal amount of sunlight, there is no distinction into upper and lower surfaces.

• Eg- In monocotyledonous leaf.
• Such leaves have stomata on both the upper and lower" surfaces of the leaf.
  

B. Bifacial- The leaves show distinction into upper (ventral) and lower (dorsal) surfaces.

• Eg- In dicotyledonous leaf.
• Such leaves have more stomata on the lower surfaces than on the upper surfaces.

C. Unifacial- In such leaves, a distinction into upper and lower surfaces is absent and the leaves are cylindrical.

So, the correct answer is 'Bifacial leaf'.