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Sunday, November 23, 2014

Que 66. Leaves of many grasses are capable of folding and unfolding because


(A) they have stomata on both sides of the leaf
(B) they have high levels of silica
(C) they have specialised bulliform cells
(D) their mesophyll is not differentiated into palisade and spongy parenchyma

Answer - (C) they have specialised bulliform cells

Explanation: In monocot leaves of grass plants, on the upper epidermis, bulliform cells are present. They help in the rolling or folding and unfolding of leaves. They also help in the process of transpiration. 

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