The introduction of high-yielding varieties of seeds and the increased use of chemical fertilizers and irrigation are known collectively as the Green Revolution. The impact of the Green Revolution was felt most in the production of wheat. India saw annual wheat production rise from 10 million tons in the 1960s to 73 million in 2006.

Correct Option: D

The introduction of high-yielding varieties of seeds and the increased use of chemical fertilizers and irrigation are known collectively as the Green Revolution. The impact of the Green Revolution was felt most in the production of wheat. India saw annual wheat production rise from 10 million tons in the 1960s to 73 million in 2006.