Question

Some vascular bundles are described as open because they

• A. possess conjunctive tissue between xylem and phloem
• B. are not surrounded by bundle sheath
• C. do not have cambium in between xylem and phloem
• D. have cambium in between xylem and phloem

Answer 1

The correct option is D have cambium in between xylem and phloem

Xylem and phloem together constitute vascular bundles. If cambium is present in between the xylem and phloem, the vascular bundle is called open. Example: Dicots
Cambium present in open vascular bundles helps in secondary growth. During secondary growth, secondary xylem and secondary phloem are produced which increases the diameter of the plant body.

If cambium is absent in between the xylem and phloem, the vascular bundle is called closed. Example: Monocots.