<span>Application Based Questions :<br> The leaves of Azolla are used as biofertilizer. Co…

The common nitrogen-fixer in paddy fields is</h2></div>

Sour cream is <i></i><i></i>produced by </h2></div>

They help in increasing soil fertility.</h2></div>

<i>Rhizobium </i>fixes atmospheric _____________</h2></div>

The fermenting agent of dosa and idli is</h2></div>

The roots of some higher plants get associated with a fungal partner. The roots provide food to the fungus while the fun…

Butyric acid is formed by the activity of Aspergillus niger.