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B
Chlorenchyma cells
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C
Motor cells
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D
Guard cells
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Solution
The correct option is C Motor cells
The large, bubble-shaped epidermal cells that occur on the upper surface of the leaves of monocots are called bulliform cells. They are also known as motor cells.
They help in the unfolding of developing leaves.
These cells, by their turgor pressure changes cause rolling and unrolling of the leaves, thus regulating water loss.
When bulliform cells are flaccid, the leaves of grass close as the two sides of the blade fold up toward each other. Once adequate water is available, the leaves open again.