What type of vascular bundles are found in leaves?

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?

Bulliform cells are responsible for

Identify the internal structure of the plant organs shown in the image below.

Palisade parenchyma is absent in leaves of

What is the shape of the mesophyll cells in a leaf?