Pollens have two prominent walls which are ... $A$... and ... $B$ .... Here $A$ and $B$ refers to

  • A
    $A-Intine, B-Protein coat$
  • B
    $A-Exine, B-Intine$
  • C
    $A-Sporopollenin, B-Intine$
  • D
    $A-Sporopollenin, B-Exine$

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