Article 84 (under Part V. – The Union)[13] of Indian Constitution sets qualifications for being a member of Lok Sabha, which are as follows:
He / She should be a citizen of India, and must subscribe before the Election Commission of India, an oath or affirmation according to the form set out for the purpose in the Third Schedule of the Indian Constitution.
He / She should not be less than 25 years of age.
He / She possesses other such qualifications as may be prescribed in that behalf by or under any law made by the Parliament.
He / She should not be proclaimed criminal i.e. they should not be a convict, a confirmed debtor or otherwise disqualified by law; and
He / She should have his/her name in the electoral rolls in any part of the country.
However, a member can be disqualified of being a member of Parliament:
If he / she holds office of profit;
If he / she is of unsound mind and stands so declared by a competent court
If he / she is an undischarged insolvent;
If he / she is not a citizen of India, or has voluntarily acquired the citizenship of a foreign State, or is under any acknowledgment of allegiance or adherence to a foreign State;
If he / she is violating party discipline (as per Tenth schedule of the constitution); disqualified under Representation of People Act.
A seat in the Lok Sabha will become vacant in the following circumstances (during normal functioning of the House):
When the holder of the seat, by writing to the speaker, resigns.
When the holder of the seat is absent from 60 consecutive days of proceedings of the House, without prior permission of the Speaker.
When the holder of the seat is subject to any disqualifications mentioned in the Constitution or any law enacted by Parliament.
A seat may also be vacated when the holder stands disqualified under the 'Anti-Defection Law'.
Furthermore, as per article 101 (Part V.—The Union)[14] of the Indian Constitution, a person cannot be:
A member of both Houses of Parliament and provision shall be made by Parliament by law for the vacation by a person who is chosen a member of both Houses of his seat in one House or the other.
A member both of Parliament and of a House of the Legislature of a State.