During conditions of water stress, what is the physical state of the bulliform cells in grass leaves and its consequent effect on the leaf lamina?

Step-by-step solution

According to NCERT, in grasses, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells 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. Answer: They become flaccid and make the leaves curl inwards.