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The correct answer is option (b): 2 and 3 only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 2021, GS Paper 1, as Question 52. It falls under Environment & Ecology > Sustainable Agriculture & Forestry.
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
UPSC has asked 31 questions from Sustainable Agriculture & Forestry (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.