Explanation:

The anti-defection law punishes individual Members of Parliament (MPs)/MLAs for leaving one party for another.

• The Tenth Schedule (popularly known as the Anti-Defection Act) was included in the Constitution via the 52nd Amendment Act, 1985.
• It sets the provisions for disqualification of elected members on the grounds of defection to another political party. 
• However, it allows a group of MP/MLAs to join (i.e. merge with) another political party without inviting the penalty for defection. And it does not penalise political parties for encouraging or accepting defecting legislators.
• As per the 1985 Act, a 'defection' by one-third of the elected members of a political party was considered a 'merger'.

But the 91st Constitutional Amendment Act, 2003, changed this and now at least two-thirds of the members of a party have to be in favour of a "merger" for it to have validity in the eyes of the law. 

• The members disqualified under the law can stand for elections from any political party for a seat in the same House. 
• The decision on questions as to disqualification on ground of defection are referred to the Chairman or the Speaker of such House, which is subject to ‘Judicial review’. 

Hence both statements 2&3 are incorrect.