(a) The Green Revolution within India commenced in the early 1960s that led to an increase in food grain production, especially in Punjab, Haryana and Uttar Pradesh. The term “Blue Revolution” refers to the remarkable emergence of aquaculture (fisheries) as an important and highly productive agricultural activity. White Revolution was one of the biggest dairy development movements. In 1970, it helped to increase milk productivity. Grey Revolution is associated with increased fertiliser production.