what is the principle of flectrostatic precipitator,scrubber and organic farming

For electrostatic precipitator and scrubber you may refer to the following link

http://cbse.meritnation.com/study-online/study-material/N@AL3JktQtik4QRSGAX7YA!!/EgYRjAL$6k9c$@KXzt07GQ!!

Organic farming is an agricultural practice where chemical fertilizers, weedicides, pesticides are not used. it relies on practices such as crop rotation, compost, green manure etc.

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