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DAILY FREE MCQ CHALLENGE for Pre-Medical Entrance Preparation
Question
Bulliform cells are present in:
A. Bundle sheath
B. Mesophyll
C. Vascular bundles
D. Epidermis
NOTEImportant Question from AIIMS
See Answer Here
D. Epidermis
See Explanation Here
In grasses, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells. When the bulliform cells in the leaves have absorbed water and are turgid, the leaf surface is exposed. When they are flaccid due to water stress, they make the leaves curl inwards to minimise water loss.

References
NCERT Biology Text, Class: XI, Unit II: Structural Organisation in Plants and Animals, Chapter 6: Anatomy of Flowering Plants, Page no: 94.
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