Biology: Concepts and Investigations 2nd Edition by Mariëlle Hoefnagels

تمرين 10

Angiosperms have both tracheids and vessel elements; conifers and ferns have only tracheids. Propose a hypothesis that explains how xylem with vessel elements might be advantageous over xylem that contains only tracheids. In what circumstances might tracheids-only xylem be adaptive?