Question

Some vascular bundles are described as open because these

• A. Possess conjunctive tissue between xylem and phloem.
• B. Are not surrounded by pericycle.
• C. Are surrounded by pericycle but no endodermis.
• D. Are capable of producing secondary xylem and phloem.

Answer 1

Answer: (D)

Are capable of producing secondary xylem and phloem.

Vascular bundle which have cambium are called as open vascular bundles. Open vascular bundles contains an interfascicular cambium in between phloem and xylem. Phloem and xylem are not in direct contact with each other in that case. Secondary growth occurs in the cambial tissues. So, open bundles produce secondary xylem and phloem in between the primary phloem and xylem. These are either collateral or bicollateral

So, the correct answer is 'Are capable of producing secondary xylem and phloem'