Grass leaves curl inwards during very dry wea | vedclass

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(B) In many monocot leaves,such as grasses,certain adaxial epidermal cells along the veins modify themselves into large,empty,colourless cells called

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Flaccidity of bulliform cells

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(B) In many monocot leaves,such as grasses,certain adaxial epidermal cells along the veins modify themselves into large,empty,colourless cells called $bulliform$ cells.When these cells absorb water and are turgid,the leaf surface is exposed.However,during very dry weather,these $bulliform$ cells lose water due to stress and become flaccid.This loss of turgidity causes the leaves to curl inwards to minimize the surface area exposed to the atmosphere,thereby reducing the rate of transpiration and preventing water loss.

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following:

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The large empty colourless cells seen on the upper epidermis in grasses which facilitate the curling of leaves to minimise water loss are . . . . . .

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