Question

A section of the stem had vascular bundles, where one tissue was wrapped around the other. How will you technically describe it?

Answer 1

Concentric vascular bundle: 

a. When one vascular tissue is completely encircling the other, it is called as concentric vascular bundle. 

b. When phloem is encircled by xylem, it is called as leptocentric vascular bundle, whereas when xylem is encircled by phloem, it is called as hadrocentric vascular bundle. 

c. When xylem is encircled by phloem on both faces, it is called as amphicribral vascular bundle. When phloem is encircled by xylem on both faces it is called as amphivasal vascular bundle.