Question

Vascular bundles having cambium are called as

• A. Open
• B. Closed
• C. Endarch
• D. Exarch

Answer 1

Answer: (A)

Open

If vascular bundles contains cambium in between xylem and phloem, it is called as open vascular bundles, which are present in dicots. If vascular bundles does not contains cambium in between xylem and phloem, it is called as closed vascular bundles, which are seen in monocots.

Endarch is the arrangement in which the protoxylem is directed towards the centre and metaxylem elements towards the periphery. The development of the xylems in this arrangement follows the centrifugal pattern. It is the characteristics of the stem of flowering plants.

Whereas exarch is the arrangement in which the protoxylem is directed towards the periphery and metaxylem towards the centre. The development of the xylem in this arrangement follows the centripetal pattern. It is the characteristics of roots

So, the correct answer is 'Open'