Transport in Plants Question 36
36. Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following:
(a) Closure of stomata
(b) Flaccidity of bulliform cells
(c) Shrinkage of air spaces in spongy mesophyll
(d) Tyloses in vessels
Show Answer
Answer : b
Hints & Solutions
(b) Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells become flaccid due to water loss. Loss of turgor pressure in these cells causes leaves to “roll up” during water stress.
