Green Revolution:

• In India, agriculture mainly accounts 33 per cent of India’s GDP and employs nearly 62 per cent of the population.
• The development of several new varieties of Wheat, Rice and many other crops has increased food productivity in India, called Green revolution. Many semi-dwarf varieties of rice and wheat were also formed.

i) Wheat and rice:

• Norman E. Borlaug, at International Centre for Wheat and Maize, Mexico, developed semi-dwarf wheat. 
• Sonalika and Kalyan Sona, are high yielding and disease resistant varieties of wheat.
• Many semi dwarf varieties of rice were introduced by Rice Research Institute (IRRI), Philippines) and Taichung Native-1 (from Taiwan).  
• Better-yielding semi dwarf varieties of rice are Jaya and Ratna.

ii) Sugarcane:

• Saccharum barberi was grown in north India, and had poor sugar content and yield. 
• Saccharum officinarum was grown in south India and had thicker stems and higher sugar content but did not grow well in north India.
• And these two species were successfully crossed to get improved sugar cane varieties with the following desirable qualities: High yield, high sugar contents, thick stem and ability to grow in North India.

iii) Millets:

• Hybrid maize, jowar and bajra have been successfully developed in India.
• These hybrids have  high yielding quality with resistant to water stress.