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(D) In grasses,certain adaxial epidermal cells along the veins modify themselves into large,empty,colourless cells. These are called $Bulliform$ cells

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Bulliform cells

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(D) In grasses,certain adaxial epidermal cells along the veins modify themselves into large,empty,colourless cells. These are called $Bulliform$ cells.When these cells in the leaves have absorbed water and are turgid,they make the leaf surface exposed.When they become flaccid due to water stress,they make the leaves curl inwards to minimize water loss.Therefore,the correct option is $D$.

Large,empty,colourless cells present on the upper surface of grass leaves are $:-$

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