Citric acid is obtained from _______</h2></div>

Secondary treatment is carried out for removal of;<span><br> </span></h2></div>

The first petroplant discovered was ________

What is the role of micro-organism in increasing the fertility of the soil?<br> </h2></div>

Which of the following is a pair of biofertilizer?</h2></div>

The major gas in biogas production is ___________.</h2></div>

<i>Trichoderma harzianum</i> has proved a useful microorganism for</h2></div>

Living organisms used to enrich the nutrient quality of the soil are called as</h2></div>