secondary growth in root and stem

1.	secondary growth in root and stem
Answer» In botany,\xa0secondary growth\xa0is the\xa0growth\xa0that results from cell division in the cambia or lateral meristems and that causes the\xa0stems\xa0and\xa0roots\xa0to thicken, while primary\xa0growth\xa0is\xa0growth\xa0that occurs as a result of cell division at the tips of\xa0stems\xa0and\xa0roots, causing them to elongate, and gives rise to primary tissue.\xa0Secondary growth\xa0occurs in many\xa0roots\xa0and usually results in\xa0the\xa0thickening of\xa0the root\xa0diameter by\xa0the\xa0addition of vascular tissue. Initiation of\xa0secondary growth\xa0occurs when cells in\xa0the\xa0residual procambium and parts of\xa0the\xa0pericyle begin to make periclinal divisions.\xa0Primary\xa0growth\xa0produces\xa0growth\xa0in length and development of lateral appendages.\xa0Secondary growth\xa0is the formation of\xa0secondary\xa0tissues from lateral meristems. ...\xa0Secondary growth\xa0occurs in perennial gymnosperms and\xa0dicots\xa0such as trees and shrubs. It is also found in the woody\xa0stems\xa0of some herbs.

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