In dicot leaf,vascular bundles are surrounded by......

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 present in.....

In $Pinus$ needle,vascular bundles are:

In a leaf,on which side is the phloem located?

Bulliform cells are responsible for