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The correct answer is option (c): Phumdis. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 1998, GS Paper 1, as Question 65. It falls under Environment & Ecology > Water & Wetland Conservation.
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
UPSC has asked 20 questions from Water & Wetland Conservation (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.