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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.
In photosynthesis, the plant uses water and nutrients from the soil, and carbon dioxide from the air with the sunâs energy to create photosynthates. Oxygen is releases as a byproduct. Figure 2.ranspiration uses about 90% of the water that enters the plant. The other 10% is an ingredient in photosynthesis and cell growth. Transpiration serves three essential roles: 1  Movement of minerals up from the root (in the xylem) and sugars (products of photosynthesis) throughout the plant (in the phloem).