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Palm is a monocotyledonous plant, yet it...

Palm is a monocotyledonous plant, yet it increases in girth. Why and how ?

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Normally secondary growth is absent in monocot plants due to absence of cambium. In palm, secondary growth occurs due to primary thickening meristem. It originates below the region of attachment of young leaf primordia. This meristem shows periclinal division to form anticlinal rows of cells which are responsible for increasing the width of plant first and height at later stages.
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