Mark the incorrect statement

  • A

    Outer three layers of anther wall are protective in function

  • B

    Sporogenous tissue, occupies the centre of each microsporangium

  • C

    Cells of tapetum and endothecium show increase in $DNA$ contents by endomitosis and polyteny

  • D

    Ploidy level of microspore tetrad is haploid

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