Question

The xylem in which the protoxylem is directed towards the periphery and metaxylem towards the centre

• A. Exarch
• B. Mesarch
• C. Endarch
• D. Diarch

Answer 1

Answer: (A)

Exarch

• Primary xylem is of two types -protoxylem and metaxylem.
  
• When protoxylem is at the center and metaxylem is at periphery it is called endarch condition present in the stem.
• When protoxylem is at the periphery and metaxylem is at the center it is exarch condition as seen in roots.
• In diarch condition, two vascular bundles are present in dicots.
• When protoxylem is surrounded by metaxylem is the mesarch condition.

So the correct option is "Exarch".