Question

Bulliform cells are:

• A. Water filled and highly vacuolated epidermal cells
• B. Collenchymal cells
• C. Sclerenchymal cells
• D. Ball like parenchymatous cells

Answer 1

The correct option is A Water filled and highly vacuolated epidermal cells

Bulliform cells are so-called because of their peculiar bubble shape. It mainly occurs on the upper surface of the leaves in grasses. Water present in these cells helps to maintain their shape but the 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.

So, the correct answer is option A.