The algal zone is a characteristic feature of:

  • A
    Normal root of $Cycas$
  • B
    Root of $Pinus$
  • C
    Coralloid roots of $Cycas$
  • D
    Stem of $Cycas$

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$A$ microsporophyll in $Pinus$ has

Which of the following gymnospermic coralloid roots are associated with $N_{2}$-fixing cyanobacteria?

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