Define the term organic farming. Write its four advantages.

(N/A) Organic farming: Production of unpolluted plant products by pursuing a farming system with minimal or no use of chemicals as fertilizers,herbicides,pesticides,etc.,is known as organic farming.
Advantages of organic farming:
$(i)$ In organic farming,there is minimal or no use of chemicals.
$(ii)$ In this farming,micro-organisms present in the soil are replenished.
$(iii)$ It maintains the soil fertility.
$(iv)$ Food obtained by this process is nutritious and unpolluted.