Nitrogen fixation in root nodules of Alnus is brought about by

Antibiotics are mostly obtained from

The removal of floating and suspended solids from sewage through filtration and sedimentation is the part of

Consider the following statements $(A-D)$ about organic farming.

$(A)$ Utilizes genetically modified crops like Bt cotton

$(B)$ Uses only naturally produced inputs like compost

$(C)$ Does not use pesticides and urea

$(D)$ Produces vegetables rich in vitamins and minerals

Which of the above statements are correct ?

Drinking of mineral water with very low level of pesticides (about $0.02 ppm$) for long periods may