Bulliform cells are responsible for

The epidermis in a dorsiventral leaf:
$(a)$ Covers both adaxial and abaxial surfaces
$(b)$ Is not covered by cuticle
$(c)$ Bears more stomata on the upper side
$(d)$ May even lack stomata on the upper side
Which of the above statements are correct?

$A$ dorsiventral leaf has:

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

Between which of the contiguous cells is the middle lamella absent?

In which of the following is the mesophyll differentiated into palisade and spongy parenchyma?