Union Government
(1) The House of the People shall consist of - (a) not more than five hundred and thirty members chosen by direct election from territorial constituencies in the States, and (b) not more than twenty members to represent the Union territories. (2) Seats are allotted to each State so that, as far as practicable, the ratio between a State's seats and its population is the same across all States, and each State is divided into constituencies on a similarly proportional basis, based on specified census figures.
Unlike the Rajya Sabha, the Lok Sabha (House of the People) is directly elected by ordinary voters from territorial constituencies, with seats distributed between States roughly in proportion to population - so, broadly, more populous states get more Lok Sabha seats.
This is why Uttar Pradesh, India's most populous state, has by far the largest number of Lok Sabha seats, while smaller states like Sikkim have very few - the allocation follows population, not equal representation per state (unlike the US Senate, for comparison).