Question

A bicollateral vascular bundle has which of the following arrangement of tissues?

• A. Outer phloem - outer xylem - middle cambium - inner xylem - inner phloem
• B. Outer cambium - outer phloem - middle xylem - inner phloem - inner cambium
• C. Outer phloem - outer cambium - middle xylem - inner cambium - inner phloem
• D. Outer xylem - outer cambium - middle phloem - inner cambium - inner xylem

Answer 1

Answer: (C)

Outer phloem - outer cambium - middle xylem - inner cambium - inner phloem

A primary vascular bundle, where the phloem occurs on either side of the xylem. Phloem occurs above (external to) the metaxylem, and also below (internal to) the protoxylem elements in bicollateral vascular bundle in stems. In leaves, the phloem strands occur on either side of the xylem (adaxial and abaxial face of the bundle) in major veins in some families.

Thus, the correct answer is option C.