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What is protoxylem lacuna?...

What is protoxylem lacuna?

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i. in monocot stem, Xylem vessels are arranged in the form of 'Y'. The two metaxylem vessels are located at the upper two arms and one or two protoxylem vessels occur at the base.
ii. In a mature bundle , the lowest protoxylem disintegrates and forms a cavity known as protoxylem lacuna.
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The cross - section of a plant material shown the following features on viewing under the microscope. (a) Radically arranged vascular bundles. (b) Four xylem arms with protoxylem facing outer side. To which organ should it be arranged.

Knowledge Check

  • The protoxylem lacuna is present in the vascular bundles of:

    A
    dicot root
    B
    monocot root
    C
    dicot stem
    D
    monocot stem

  • The vascular bundle with protoxylem facing centre of the stem is:

    A
    exarch
    B
    endarch
    C
    tetrarch
    D
    polyarch

  • Protoxylem lacuna refers to a __________ .

    A
    thickening
    B
    arrangement of xylem
    C
    a cavity
    D
    exarch xylem

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    Differentiate between Protoxylem & Metaxylem.

    The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is

    Read the following sentences and indentify the correctly matched sentences. (i) In exarch condition, the protoxylem lies outside of metaxylem. (ii) In endarch condition, the protoxylem lies towards the centre. (iii) In centrarch condition, metaxylem lies in the middle of the protoxylem. (iv) In mesarch codition, protoxylem lies in the middle of the metaxylem.

    Read the following sentences and identify the correctly matched sentences. (i) In exarch condition, the protoxylem lies outside of metaxylem. (ii) In endarch condition, the protoxylem lie towards the centre. (iii) In centrach condition, metaxylem lies in the middle of the protoxylem. (iv) In mesarch condition, protoxylem lies in the middle of the metacylem.

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