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(C) In grasses,certain epidermal cells along the veins modify themselves into large,empty,colorless cells known as $ 	ext{bulliform cells} $.When the

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contain specialized bulliform cells.

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(C) In grasses,certain epidermal cells along the veins modify themselves into large,empty,colorless cells known as $ 	ext{bulliform cells} $.When these cells are turgid due to water absorption,the leaf surface is exposed.When there is water stress,these cells lose water and become flaccid,causing the leaf to roll inwards to minimize water loss through transpiration.

Many types of grass leaves have the ability to roll or unroll because they contain ........

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