Green Revolution in Class 9 refers to the major increase in food grain production (especially wheat and rice) that happened in India during the 1960s and 1970s due to the use of modern farming techniques. This included high-yielding variety (HYV) seeds, better irrigation, chemical fertilizers, and pesticides. It helped India become self-sufficient in food production. The Green Revolution is an important part of the chapter Improvement in Food Resources in Class 9 Science.