NEET 2019 Biology question

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

(1)Closure of stomata
(2)Flaccidity of bulliform cellsCorrect
(3)Shrinkage of air spaces in spongy mesophyll
(4)Tyloses in vessels

Answer: (2)

Solution

In grasses (monocot isobilateral leaves) the upper epidermis has large, empty, colourless bulliform (motor) cells. In dry weather they lose water and become flaccid, so the leaf blade folds or rolls inwards, which reduces the exposed surface and the rate of

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Question ID VK-092467