Which of the following is are used as bio fertilizers 1 Azolla nb...........

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Which of the following is/are used as bio-fertilizers?

1. Azolla

2. Blue-green algae

3. Alfalfa

Codes:

2 ONLY

1 and 2

1 and 3

1, 2 and 3

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Explanation:

Bio fertilizer (also bio-fertilizer) is a substance which contains living microorganisms which, when applied to seeds, plant surfaces, or soil, colonize the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant.