Identify $A$ and $B$ in the figure.

  • A
    $A$ - Root hair,$B$ - Hook
  • B
    $A$ - Hook,$B$ - Root hair
  • C
    $A$ - Bacteria,$B$ - Hook
  • D
    $A$ - Hook,$B$ - Bacteria

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Select the correct statement.

Symbiotic nitrogen-fixing bacterium is . . . . . . .

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