Who was the first person to discover an antibiotic?

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

Polluted water can be purified by using</h2></div>

Match column I with column II and select the correct answer from the given codes. <br> <table class=&q…

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

Which one of the following is not used as biofertiliser?</h2></div>

What measures are to be taken to save paper?</h2></div>

Which of the following processes provide both energy and manure?