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I, II, III, and IV are correct statements.
Explanation:
I. Gulf of Mannar is indeed one of the biosphere reserves. Located on the southeastern coast of India, Gulf of Mannar Biosphere Reserve is recognized for its rich marine biodiversity and is home to various endangered species.
II. The Ganga Action Plan, Phase II, has been merged with the National River Conservation Plan. The Ganga Action Plan was initially launched in 1986 to address pollution in the Ganga river. Over time, it has been integrated into the broader National River Conservation Plan, which covers multiple rivers across India.
III. The National Museum of Natural History in New Delhi does impart non-formal education in environment and conservation. The museum showcases exhibits related to India`s natural heritage and raises awareness about environmental issues.
IV. The Environmental Information System (ENVIS) does act as a decentralized information network for environmental information in India. ENVIS is a program established by the Ministry of Environment, Forest and Climate Change to collect, collate, and disseminate information related to various environmental topics.
Therefore, all the statements I, II, III, and IV are correct.