In the leaf, vascular bundles are found in the
a)	Veins	b)	Palisade tissues	c)	Lower epidermis	d)	Upper epidermis

(a)

In leaves, the tissues, which constitute the conduction system (i.e., vascular bundles) are situated near or at the centre of the midrib and generally form a ring composed of xylem (towards upper surface) and phloem (towards lower surface). The structure of large veins is more or less similar to that of a midrib. The small veins consist of only of few conducting cells.