Explanation:

The Anti-Defection Law 

• It was passed in 1985 through the 52nd Amendment to the Constitution, which added the Tenth Schedule to the Indian Constitution. 
• The main intent of the law was to combat “the evil of political defections”.
• Articles 102 (2) and 191 (2) deal with anti-defection.
• The law applies to both Parliament and state assemblies.

Split and merger under anti-defection law

• The 91st amendment to the Constitution in 2003, does not recognise a ‘split’ in a legislature party.
• Instead, it recognises a ‘merger’ that requires at least two-thirds of the members of a legislature party to join another political formation or form a new one without getting disqualified under the anti-defection law.

Hence only statement 2nd is correct.