What is the Green revolution? What was its need? Discuss 3 positives and 3 negative effects of the green revolution?

The answer to your question is already covered in our study material. Follow the given link and scroll down to the topic 'Technical reforms/ green revolution' to view the same.

https://www.meritnation.com/cbse/class11-commerce/studymaterial/economics/indian-economic-development/unit-iindian-economy-1950-1990/442_2484_6370#slide3_five-year-plans-and-agriculture