Correct Answer: Two

Solution : The correct option is Two .

The success of the Green Revolution in India can be broadly divided into two main phases:

First phase (mid-1960s to early 1970s) :  It was characterized by high-yielding varieties (HYVs) of seeds, particularly for wheat and rice. This phase saw a significant increase in agricultural productivity, leading to higher food grain production and self-sufficiency in food.

Second phase (1970s and beyond) : It involved the spread of the technology to other crops and regions. The success achieved with wheat and rice in the first phase prompted the extension of the Green Revolution to crops like millet, maize and pulses. It also expanded to different states.