What is sludge?</h2></div>

Do you think microbes can also be used as source of energy? If yes, how?</h2></div>

Who developed the treatment technique for industrial and sewage waste water?</h2></div>

Which of the following is used as a green manure?</h2></div>

In paddy fields, biological nitrogen fixation is chiefly brought about by.</h2></div>

Identify the microorganism that produces biomass of proteins.</h2></div>

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

What is the alcohol content in beer?