Question

Identify the type of vascular tissue and label.

• A. A $\to$ exarch, B $\to$ endarch, C $\to$ mesarch
• B. A $\to$ mesarch, B $\to$ exarch, C $\to$ endarch
• C. A $\to$ endarch, B $\to$ mesarch, C $\to$ exarch
• D. A $\to$ endarch, B $\to$ exarch, C $\to$ mesarch

Answer 1

The correct option is D A $\to$ endarch, B $\to$ exarch, C $\to$ mesarch

Primary xylem is called as protoxylem it has narrower lumen, secondary xylem is called as metaxylem and has a wider lumen.
The type of arrangement of the xylem vessels in which the metaxylem is at the periphery and protoxylem in the centre is called as endarch.

The type of arrangement in which metaxylem is at the centre and protoxylem at the periphery is called as exarch.
Mesarch is the type of arrangement in which there are more than strand of primary xylem so that the secondary xylem or metaxylem is created both at the central and periphery to the protoxylem.
So, the correct answer is option D.