A) It is seen in grasses.
B) It is large-sized, thin-walled colourless, vacuolated cells on the ad axial surface.
C) It helps in rolling of leaf to minimise water loss when it is flaccid.
D) All of the above
Correct Answer: D
Solution :
[d] All the statements are correct regarding bull form or motor cells. They are large, bubble-shaped, empty, colourless epidermal cells that occur in groups on the upper surface of the leaves of many grasses. Loss of turgor pressure in these cells causes leaves to "roll up" during water stress.
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