the vascular tissues in leaves form?

Question

A)veins
B)guard cells
C)petioles
D)tracheids

Answer 1

VEIN
A vein is a vascular structure (xylem and phloem cells surrounded by the bundle sheath) in a leaf that provides supports for the leaf and transports both water and food. The veins on monocots are almost parallel to the margins of the leaf. The veins of dicots radiate from a central midrib.

From http://www.enchantedlearning.com/subjects/plants/glossary/indexv.shtml