Which one among the following is not a part of vascular bundle in pl

Which one among the following is not a part of vascular bundle in plants ?

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Phloem

Xylem

Cambium

Endodermis

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UPSC CDS-2 – 2024

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A vascular bundle in plants is the primary conducting strand, composed mainly of xylem and phloem, which transport water, minerals, and sugars. In dicotyledonous plants and gymnosperms, cambium is also present between xylem and phloem, facilitating secondary growth. The endodermis, however, is a layer of ground tissue that surrounds the vascular cylinder (stele), particularly prominent in roots and some stems, and is not considered part of the vascular bundle itself.

– Vascular bundles contain xylem (water transport) and phloem (sugar transport).
– Cambium is involved in secondary growth and is part of the vascular bundle structure in plants with secondary growth.
– The endodermis functions as a selective barrier controlling the movement of substances into the vascular cylinder via the Casparian strip.

Vascular bundles can be arranged differently in different plant organs and species (e.g., scattered in monocot stems, in a ring in dicot stems, forming a central cylinder in roots). The endodermis plays a crucial role in filtering substances absorbed by the root before they enter the xylem.

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