Q. Which of the following was/were used extensively in Green Revolution?
  1. HYV seeds
  2. Irrigation
  3. Chemical fertilisers
  4. Pesticides
Select the correct answer from the codes given below:

Answer: All of the above
Notes: All the above were used extensively in Green Revolution. Higher yields were possible only from a combination of HYV seeds, irrigation, chemical fertilisers, pesticides, etc.