Activated sludge should have the ability to settle quickly so that it can:</h2></div>

Treatment of polluted water is carried out with the help of ?</h2></div>

Which of the following statements is correct with regard to biocontrol agents ?<span><br> </span></…

Give scientific reasons.<div><br> a. Foam accumulates on the surface of 'dal' kept for a long time …

Rhizobium _______</h2></div>

Which disease is caused in children due to excessive use of nitrate fertilizers?</h2></div>

Which one of the following is wrong statement?</h2></div>

The nutritive medium for growing bacteria and many fungi in laboratory is called </h2></div>