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Secondary Growth in Roots Secondary growth occurs in many roots and usually results in the thickening of the root diameter by the addition ofvascular tissue.Initiation of secondary growth occurs when cells in the residual procambium and parts of the pericyle begin to make periclinal divisions.Only the pericyle cells opposite the xylem points start to make periclinal divisions. The inner layer of cells becomes the vascular cambium.nitiation of secondary growth occurs when cells in the residual procambium and parts of the pericyle begin to make periclinal divisions. Only the pericyle cells opposite the xylem points start to make periclinal divisions.
This non-native species causes extensive ecological damage to native habitats. Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat.Examples include areas which have been cleared of existing vegetation (such as after tree-felling in a woodland) and destructive events such as fires.Secondary succession is usually much quicker than primary succession for the following reasons: There is already an existing seed bank of suitable plants in the soil.his non-native species causes extensive ecological damage to native habitats. Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat.