NEET BIOLOGY

Detailed explanation-1: -This tissue is called vascular cambium. They form the cambial ring in plants. Formation of the cambial ring can be explained by recalling the anatomy of dicot stems. In a dicotyledonous stem, the primary xylem and primary phloem are separated by cambium cells called intrafascicular cambium.

Detailed explanation-2: -cambium, plural Cambiums, orCambia, in plants, layer of actively dividing cells between xylem (wood) and phloem (bast) tissues that is responsible for the secondary growth of stems and roots (secondary growth occurs after the first season and results in increase in thickness).

Detailed explanation-3: -Vascular cambium and cork cambium, also called secondary meristem, are responsible for secondary growth in plants. They increase the thickness of the plant body.

Detailed explanation-4: -(Recall that xylem is located toward the interior and phloem toward the exterior of the bundle.) The cells of the vascular cambium divide and form secondary xylem (tracheids and vessel elements) to the inside, and secondary phloem (sieve elements and companion cells) to the outside.

Detailed explanation-5: -Secondary vascular tissue is added by the vascular cambium, and the cork cambium generates the periderm. In the primary stem, vascular bundles surround a central pith. Each vascular bundle has xylem on the inside, phloem on the outside, and primary phloem fibers external to the phloem.