Sunken stomata are found in the leaves of

Identify the labels $P$,$Q$,and $R$ in the given cross-section of a leaf.

Large,empty,colourless cells present on the upper surface of grass leaves are known as:

Give scientific reasons: Bulliform cells are present in maize leaves.

During water stress,the bulliform cells:
$(a)$ Become turgid
$(b)$ Become flaccid
$(c)$ Make the leaves curl inwards
$(d)$ Make the leaf surface exposed
The correct options are:

When the conditions are dry,a grass leaf curls inward to minimize water loss due to the pressure of