Consider the following pairs of wetlands and the confluence of rivers they lie at: Harike Wetland – confluence of the Beas and the Sutlej Keoladeo Ghana National Park – confluence of the Banas and the Chambal Kolleru Lake – confluence of the Musi and the Krishna Which of the above pairs is/are correctly matched?

The correct answer is A, 1 only. The Harike Wetland in Punjab was created by building a barrage just below the point where the Beas joins the Sutlej, so the first pair is correct and it is the only one. Option B is wrong because it accepts the second pair, and Keoladeo Ghana National Park at Bharatpur is a man-made wetland fed by the Gambhir and Banganga through the Ajan Bandh, not a site at the meeting of the Banas and the Chambal. Option C is wrong because it accepts the third pair, and Kolleru Lake in Andhra Pradesh lies between the deltas of the Krishna and the Godavari, drained by the Upputeru, and not at any confluence of the Musi with the Krishna. Option D is wrong because it accepts both of those mismatched pairs. In matching questions of this kind, one certain pair is often enough to reach the answer by elimination.