What ia meant by green revolution

The introduction of High Yielding Varieties (HYV) of seeds and the increased use of chemical fertilisers and irrigation are known collectively as Green Revolution. It provided the increase in production needed to make India self-sufficient in foodgrains, thus improved the agricultural sector in India.

Explanation: Hope this helps you! ^^

I'm pretty sure it's c. extremely gradual but not 100% sure though.

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