The correct option is 2 and 3 only.
Explanation
Wetlands are transitional zones between terrestrial and aquatic ecosystems where the water table is usually at or near the surface. India is a signatory to the Ramsar Convention (1971), an international treaty for the conservation and sustainable use of wetlands.
Statement 1 is Incorrect: The definition of wetlands under the Ramsar Convention is extremely broad and explicitly includes man-made wetlands such as rice paddies (areas under paddy cultivation). While the domestic Wetlands (Conservation and Management) Rules in India exclude paddy fields to prevent regulatory conflicts with agriculture, in the scientific and Ramsar context, they are considered wetland habitats.
Statement 2 is Correct: Chilika Lake (Odisha) and Keoladeo National Park (Rajasthan) were the first two sites in India to be designated as Ramsar sites in 1981. They are protected primarily as critical habitats for waterfowl and migratory birds (e.g., the Siberian Crane in Keoladeo).
Statement 3 is Correct: According to standard Indian geographical classification, the country’s wetlands have been grouped into eight categories based on regional and physical characteristics. These include: 1. Reservoirs of the Deccan Plateau 2. Vast saline expanses of Rajasthan and Gujarat 3. Freshwater lakes from Gujarat to Odisha 4. Delta wetlands and lagoons 5. Freshwater marshes of the Gangetic Plain 6. Floodplains of the Brahmaputra 7. Lakes of the Montane region (J&K, Himachal, etc.) 8. Mangrove forests and wetlands of the island arcs.
Key Takeaway: The Ramsar Convention definition of wetlands is comprehensive and includes agricultural wetlands like paddy fields. Chilika and Keoladeo are India's oldest Ramsar sites, designated for waterfowl conservation.