Which of the following statements is incorrect ?</h2></div>

Describe the biogas plant with a neat labelled diagram.</h2></div>

Mixture of biogas contains</h2></div>

Passage of effluents into oxidation tank is for</h2></div>

Discuss the role of fungi as biofertilizers.</h2></div>

Which bacteria was used as biopesticide, for the first time on the commercial scale in the world?</h2></div>

<i>Azolla </i>is used as a biofertilizer because <br> </h2></div>

Secondary treatment is also known as ________________.<span><br> </span></h2></div>