Question

Take a look at the diagram below and ascertain the type of xylem. Consider the upper side to be the outer side and the lower side to be the inner side.

• A. 1- Mesarch, 2- Endarch, 3- Exarch
• B. 1- Endarch, 2- Exarch, 3- Mesarch
• C. 1- Exarch, 2- Endarch, 3- Mesarch
• D. 1- Endarch, 2- Mesarch, 3- Exarch

Answer 1

The correct option is B

1- Endarch, 2- Exarch, 3- Mesarch

In exarch, the protoxylem grows outside while the metaxylem is seen inside. In endarch, the metaxylem is found outside and the protoxylem is seen inside. While in mesarch form, the protoxylem and metaxylem grow in an interspersed fashion.