How does $Azolla$ (a pteridophyte) increase rice production?

  • A
    $Rhizobium$
  • B
    $Nostoc$
  • C
    $Anabaena$
  • D
    $Frankia$

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Which of the following statements is incorrect?

The common nitrogen-fixer in paddy fields is

Blue-green algae increase the concentration of which substances in the soil?

$A$ nitrogen-fixing microbe associated with $Azolla$ in rice fields is

The common nitrogen fixer in paddy fields is . . . . . . .

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