In organic farming, organic manure and natural pesticides are used instead of chemicals. No genetic modification is done to increase the yield of the crops.
Agriculture means cultivation on field. The term 'agriculture' is derived from latin words 'ager' or 'agri' meaning soil and 'culture' meaning cultivation.
Secondary activities are concerned with the processing of primary or natural products, i.e., manufacturing of the products like baking of bread, weaving of cloth, etc.