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The aquatic fern which is an excellent b...

The aquatic fern which is an excellent biofertilizer is

A

Salvinia

B

Azolla

C

Marselia

D

Pteridium

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Biofertilizers.

Define biofertilizers.

Knowledge Check

  • A biofertilizer is

    A
    Cyanobacterium Anabaena in cavities of Azolla leaves
    B
    Symbiotic associtation of Azotobacter for fixing atmospheric nitrogen
    C
    Farmyard manure
    D
    Green manure
  • Biofertilizers

    A
    Kill pests
    B
    Prevent pest growth
    C
    Retain soil fertility
    D
    All of above
  • The biofertilizers are

    A
    Anabaena and Azolla
    B
    Cow dung, manure and farmyard waste
    C
    Quick growing crop ploughed under soil
    D
    None of these
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    Which one is not a biofertilizer

    Which one is not a biofertilizer ?