In isobilateral leaf more plastids are found in

Describe internal structure of Dorsiventral (Dicotyledonous) leaf.

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?

Large, empty colourless cells of the adaxial epidermis along the veins of grass leaves are

Grass leaves can fold and unfold because they