The correct option is (b) Only two pairs.
Explanation
This question tests the geographical locations of specific wetlands and lakes in India, all of which are designated Ramsar Sites of international importance.
- Pair 1 is Incorrect: Hokera Wetland (also known as Hokersar) is located in the Union Territory of Jammu and Kashmir, not Punjab. It is a natural perennial wetland situated in the Jhelum basin.
- Pair 2 is Correct: Renuka Wetland is located in the Sirmaur district of Himachal Pradesh. It is a natural wetland with freshwater springs and inland subterranean karst formations. It is one of the smallest Ramsar sites in India.
- Pair 3 is Correct: Rudrasagar Lake is located in the state of Tripura. It is a lowland sedimentation reservoir in the northeast hills, fed by three perennial streams discharging into the River Gomti.
- Pair 4 is Incorrect: Sasthamkotta Lake is located in Kerala (Kollam district), not Tamil Nadu. It is the largest freshwater lake in Kerala and provides drinking water to the Kollam district.
Key Takeaway: Hokera Wetland is in Jammu & Kashmir, and Sasthamkotta Lake is in Kerala. Only Renuka Wetland (Himachal Pradesh) and Rudrasagar Lake (Tripura) are correctly matched.