Bio Fertilizers are considered as biologically active products since they 1 Are micro...........

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Bio Fertilizers are considered as biologically active products since they

1. Are microbial inoculants of bacteria, algae and fungi

2. Include organic fertilizers

3. Include symbiotic nitrogen fixers

Select the correct answer using the codes given below:

1 only

1 and 3 only

2 and 3 only

All the above

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Explanation:

A 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.