Origin and activity of vascular cambium,Cambium Strips,Protoxylem,Parenchyma Cells,Medullary rays

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Origin and activity of vascular cambium
Vascular cambium is absent in primary root and later appears as secondary meristem. Some cells of conjunctive tissue below phloem bundles become meristematic to produce cambium strips

These soon join cambium strips arising form pericycle, opposite the protoxylem to form a wavy ring or cambium. The vascular cambium below phloem bundles produces secondary xylem on inner side and secondary phloem elements outwards. With addition of wood on inner side, the primary phloem bundles are pushed outer side and gets crushed. The primary xylem still remain intact. Secondary xylem consists of the regular xylem elements.

Primary Tissues and Secondary Growth	Secondary Xylem and Phloem - Xylem Rings
a - Epidermis b - Cortex c - Endodermis d - Pericycle e - Primary Phloem f - Primary Xylem g - Cambium h - Secondary Xylem i - Secondary Phloem j - Cambium	k - epidermis l - Cortex m - Endodermis n - Pericycle o - Secondary Phloem p - Cambium q - Remnant of Primary Phloem r - Secondary Xylem s - Primary Xylem t - Cork u - Cork Cambium v - Phelloderm x - Secondary Xylem-Ist Year y - Secondary Xylem-IInd Year z - Secondary Xylem-IIIrd Year

Root being an underground part, annular rings are absent in its wood as the cambium activity is unaffected by change in climate. The secondary phloem is made up of complete elements. Opposite the protoxylem elements, the cambium cuts off radially elongated parenchyma cells on both sides. These bands are called primary medullary rays. At several places the cambium produces secondary medullary rays. They help in radial conduction of substances.

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Anatomy of Flowering Plants Tissue and Meristematic Tissue Classification of Meristematic Tissue Apical Meristems of Stem and Root Permanent Tissue Simple Permanent Tissue Complex Tissues - Xylem Types of Xylum Complex Tissues - Phloem Classification of Permanent Tissue on Basis of Their Functions Types of Vascular Bundles Anatomy of Monocot Stem - Maize, Primary Structure of Stem Anatomy of Dicotyledonous Stem - Sunflower Stem Secondary Growth in Dicot System Origin and Activity of Cambium Origin and Activity of Cork Cambium Heart Wood and Sap Wood Primary Structure of Monocot Root Primary Structure of Dicot Root Secondary Growth in Dicot Roots Origin and Activity of Vascular Cambium Origin and Activity of Cork Cambiums Internal Structure of Dicot Leaf Internal Structure of Xerophytic Leaf Internal Structure of Monocot Leaf - Isobilateral Leaf