Question

Bicollateral conjoint vascular bundles have

• A. Xylem and phloem, which are arranged in an alternate manner on different radii.
• B. Xylem and phloem, which are situated at the same radius and it has two groups of phloem along the two sides of xylem (inside and outside).
• C. Xylem and phloem in same radius but it has only one group phloem outside the xylem.
• D. Phloem surrounds the xylem tissues and xylem surrounds the phloem tissues.

Answer 1

Answer: (B)

Xylem and phloem, which are situated at the same radius and it has two groups of phloem along the two sides of xylem (inside and outside).

• Xylem and phloem elements are combined in a central strand without pith, the stele.
• Bicollateral vascular bundle is a type of conjoint vascular bundle where the xylem is present in the middle portion of two phloem strands.
• Hence, bicollateral conjoint vascular bundles have xylem and phloem, which are present at the same radius. Also, they show the presence of two groups of phloem along the two sides of the xylem.

Thus, the correct answer is option B.