Union Government
(1) A person shall be disqualified for being a member of either House of Parliament - (a) if he holds any office of profit under the Government of India or a State (other than an office Parliament has declared not disqualifying); (b) if of unsound mind as declared by a competent court; (c) if an undischarged insolvent; (d) if not a citizen of India, or has voluntarily acquired foreign citizenship, or owes allegiance to a foreign State; (e) if disqualified under any law made by Parliament. (2) A person is also disqualified if disqualified under the Tenth Schedule (the anti-defection law).
This lists the specific reasons someone can be disqualified from being an MP: holding another paid government position, being of unsound mind, being an undischarged bankrupt, not being an Indian citizen (or holding foreign citizenship/allegiance), being disqualified under a Parliament-made law, or falling foul of the anti-defection rules in the Tenth Schedule.
This is the constitutional basis for the well-known "anti-defection law": an MP who defects from their party in specified circumstances can be disqualified from Parliament under the Tenth Schedule, which this article incorporates by reference.