How are vascular tissues arranged in dicot stems?

a. Xylem is near leaves phloem is near roots

b. Xylem forms an outer ring around phloem

c. Xylem and phloem are bundled randomly

d. Phloem forms an outer ring around xylem

The answer is; D

The structure is formed by the vascular cambium. In dicots, the phloem forms around the xylem hence the xylem forms the wood of the plant while the phloems form the bark. The cambium present between primary xylem and primary phloem continues to divide to form the secondary vascular tissues.