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what is exarch, endarch and polyarch and where they are present??????

These conditions tell about the condition of development of xylem.

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types xylem present in the plant cell. According to whether monocot or dicot pcell

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Of or relating to a xylem whose early development is away from the center and toward the periphery is exarch.

Of or relating to a xylem whose early development is toward the center is endarch.

Polyarch: primary xylem of root with a large number of protoxylem strands

 

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Endarch is a condition in which the first formed xylem (protoxylem) is inside while later formed xylem (metaxylem) is outside.

Exarch is a condition in which first formed xylem (protoxylem) is outside while later formed xylem (metaxylem) is inside.

Polyarch: primary xylem of root with a large number of protoxylem strands

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