Solution

According to the relative position of xylem and phloem, the vascular bun­dles are classified -
1. Radial: Those in which the xylem and the phloem with different radii lie radically side-by-side (for example, in roots of seed plants). This is the most primitive type.
2. Bi-collateral: Those vascular bundles that contain two patches of phloem on either side of the xylem on the same radius.
3. Amphivasal - Those vascular bundles in which xylem surrounds the phloem tissue from all sides of the vascular bundle.
4. Conjoint - Those in which the two types of tissues are separated from one another. Here xylem and phloem together form a bundle.
Hence, (C) is the mismatched option.