Question

Bulliform cells that help in the folding down of lamina during drought are present in the epidermis of

• A. Monocotyledonous grass leaf
• B. Dicotyledonous leaf
• C. Both A and B
• D. None of the above

Answer 1

The correct option is A Monocotyledonous grass leaf

Bulliform cells are so called because of their peculiar bubble shape. They mainly occur on the upper surface of the leaves of monocots like grasses. Water present in these cells helps to maintain its shape but loss of turgor pressure during stress allows the leaves to roll up. During drought, the loss of moisture through vacuoles induces bulliform cells to cause the leaves of many grass species to close as the two edges of the grass blade fold up toward each other. Once adequate water is available, these cells enlarge and the leaves open again.
Thus, the correct answer is option A.