NEET BIOLOGY

Detailed explanation-1: -In collateral vascular bundles phloem is situated towards outer side and xylem towards inner side and both are found on same radii, but in monocot vascular bundle are closed, i.e., cambium is absent.

Detailed explanation-2: -In collateral vascular bundles, phloem is situated towards inner side.

Detailed explanation-3: -Collateral bundles are arranged in such a way that both xylem and phloem are present on a single radius, jointly. The phloem is present external to the xylem elements. A layer of cells called cambium is sometimes present between xylem and phloem, referred to as an open vascular bundle, e.g, dicot stem.

Detailed explanation-4: -In collateral vascular bundles, xylem and phloem are arranged side by side on the same radius. When the vascular cambium is present between the xylem and phloem, the vascular bundle is called open collateral vascular bundle.

Detailed explanation-5: -The monocot cambium is a lateral meristem responsible for secondary growth in some monocotyledons of Asparagales. It is an unusual meristem, not homologous with the vascular cambia of gymnosperms and non-monocotyledonous angiosperms.