Secondary treatment of the sewage is called biological treatment. Justify the statement and explain the process.</h2&…

Which one of the following nitrogen fixing root nodule symbiotic is associated with the trees of Alnus and Casuarinas?&l…

Which is useful as biological control ?</h2></div>

Primary treatment involves filtration and distillation.

Which one of the following microbes is the source for vitamin C?<br> </h2></div>

Cellulases and hemicellulases arc in great demand nowadays for the preparation of second-generation:<span><br&g…

<i>Sesbania rostrate</i> is preferred as green manure over other species because.</h2></div>

A third generation pesticide is</h2></div>