Question

Motor or bulliform cells in grasses shows

• A. Growth movement
• B. Tropism
• C. Nastic movement
• D. Turgor movement

Answer 1

The correct option is D Turgor movement

Bulliform cells are thin-walled cells present in the epidermis of monocots, like grasses. On exposure to light of high intensity and high temperature, they lose water, thus the entire leaf droops down. This helps in reduction of transpiration. Loss of turgor pressure in these cells causes leaves to "roll up" during water stress. 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 D.