Explanation:

Estimates Committee:
The origin of this committee can be traced to the standing financial committee set up in 1921. The first Estimates Committee in the post-independence era was constituted in 1950 on the recommendation of John Mathai, the then finance minister. Originally, it had 25 members but in 1956 its membership was raised to 30. All the thirty members are from Lok Sabha only. The Rajya Sabha has no representation in this committee. These members are elected by the Lok Sabha every year from amongst its own members, according to the principles of proportional representation by means of a single transferable vote.