Palisade parenchyma is absent in leaves of

The size of vascular bundles in a dorsiventral leaf is dependent on

What are the cells that make the leaves curl in plants during water stress?

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?

Grass leaves curl Inwards during very dry weather. Select the most appropriate reason from the following