Describe internal structure of sunflower leaf.

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

Describe internal structure of Isobilateral (Monocotyledonous) leaf.

Assertion: Bulliform cells are useful in the unrolling of leaf.
Reason: Bulliform leaves store water

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?

Water containing cavities in vascular bundles are found in