(a) : The development and usage of several high yield varieties of wheat and rice, better irrigation facilities, fertilizer application, weed, pest and pathogen control and better agricultural management in $1960s$, increased the yields per unit area. This phase is often called green revolution. In India, it was witnessed during mid $1960s. $ Norman E. Borlaug is known as Father of Green Revolution as he developed the semi­dwarf varieties of wheat. In $1963$, many lines like Sonalika and Kalyan Sona were selected from these and introduced all over India. Semi­dwarf varieties of rice were developed from $IR­-8$ at International Rice Research Institute $(IRRI)$, Philippines and Taichung Native $­1$ from Taiwan which were introduced in $1966$, in India. Dr. M.S. Swaminathan, pioneer mutation breeder has produced Sharbati Sonora, a variety of wheat by mutation, which is responsible for green revolution in India. Dr. Swaminathan is called Father of Green Revolution in India.