In collateral vascular bundle,  I. single patch of phloem and xylem present.  II. Two patches
Channel: Doubtnut
Date: 2020-05-03

In collateral vascular bundle,  I. single patch of phloem and xylem present.  II. Two patches of phloem and one of xylem present.  III. Phloem present outward and xylem present inward.  IV. Phloem present outward as well as inward  to the xylem.