Question

When protoxylem is surrounded by metaxylem, it is

• A. Mesarch condition
• B. Endarch condition
• C. Exarch condition
• D. None of the above

Answer 1

The correct option is A Mesarch condition

Xylem development can be described by four terms: centrarch, exarch, endarch and mesarch. In mesarch development there are several vascular strands and in each of these protoxylem is located in the center surrounded by the metaxylem. This type of primary xylem development is found in many species of ferns.

So, the correct answer is 'Mesarch condition.'