Anonymous
Anonymous asked in Science & MathematicsBotany · 1 decade ago

can u tell me the significance of protoxylem being endarch or exarch in a vascular bundle?

whats the significance of it? how does it influence the physiology?

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  • 1 decade ago
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    Neraj is very confused.

    "Protoxylem is primary xylem [true]. It is the first xylem tissue formed in the actively dividing vascular cambium of a young plant [no, it's produced by the procambium].

    Protoxylem is secondary xylem [no. it's primary xylem]. It is formed by secondary growth from the actively dividing vascular cambium [no, see above] ."

    Endarchy and exarchy refer to the direction of maturation of the protoxylem. Roots are exarch....the outer protoxylem matures first. Shoots are endarch...the inner protoxylem matures first.

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  • 1 decade ago

    Protoxylem is primary xylem. It is the first xylem tissue formed in the actively dividing vascular cambium of a young plant.

    Protoxylem is secondary xylem. It is formed by secondary growth from the actively dividing vascular cambium. The cell walls of protoxylem are thickened by a deposit of lignin, providing mechanical support to the plant.

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