The allocation of seats in the present Lok Sabha is based on which one of the following Census ?

1. Composition of the Lok Sabha and Article 81 (basic)

The Lok Sabha, or the House of the People, serves as the representative body for the citizens of India. Under Article 81 of the Constitution, the maximum strength of the House is fixed at 550 members. This total includes up to 530 representatives from the States and up to 20 from the Union Territories Indian Polity, M. Laxmikanth (7th ed.), Parliament, p.223. It is important to note that the provision for nominating two members from the Anglo-Indian community was abolished by the 104th Amendment Act, 2019. Currently, the Lok Sabha has 543 members, all of whom are directly elected by the people through Universal Adult Franchise—meaning every citizen aged 18 or above has the right to vote Indian Polity, M. Laxmikanth (7th ed.), Parliament, p.223.

A unique feature of our parliamentary structure is the freeze on seat allocation. While Article 82 originally mandated a readjustment of seats after every census to reflect population changes, the government decided to 'freeze' the number of seats to encourage states to implement population control measures. If seats were increased based solely on population growth, states with higher birth rates would gain more political power, effectively penalizing states that successfully managed their population growth. This freeze was first implemented by the 42nd Amendment Act (1976) based on the 1971 Census and was later extended to ensure stability in representation Indian Polity, M. Laxmikanth (7th ed.), Delimitation Commission of India, p.530.

The timeline below illustrates how these constitutional changes have maintained the current composition:

To ensure fairness within a state, each state is divided into territorial constituencies. The Constitution mandates that the ratio between the number of seats allotted to a state and its population must be, as far as practicable, the same for all states. Similarly, the ratio between the population of each constituency and the number of seats allotted to it must be uniform throughout the state Indian Polity, M. Laxmikanth (7th ed.), State Legislature, p.335.

Sources: Indian Polity, M. Laxmikanth (7th ed.), Parliament, p.223; Indian Polity, M. Laxmikanth (7th ed.), Delimitation Commission of India, p.530; Indian Polity, M. Laxmikanth (7th ed.), State Legislature, p.335

2. Readjustment After Each Census (Article 82) (basic)

Imagine a classroom where seats are assigned based on the number of students. If one row suddenly gets ten new students and another stays the same, the representation becomes unfair. To prevent this in our democracy, Article 82 of the Constitution mandates a readjustment after every decennial census. This process ensures the principle of 'One Person, One Vote, One Value' by keeping the ratio between the population and the number of seats uniform across all states Indian Polity, M. Laxmikanth, Parliament, p.224.
This readjustment involves two distinct actions:

• Allocation of seats: Deciding how many total MPs each state sends to the Lok Sabha.
• Division into constituencies: Redrawing the map (boundaries) within each state so each MP represents a roughly equal number of people Indian Polity, M. Laxmikanth, Parliament, p.224.

However, a unique challenge arose in the 1970s. States that successfully implemented population control (family planning) policies feared they would be 'punished' with fewer seats, while states with high growth rates would gain more political power. To protect these population control measures, the government introduced a 'freeze' on seat allocation.

Feature	Base Census Year	Current Status
Total Seats per State	1971 Census	Frozen until 2026
Internal Boundary Redrawing	2001 Census	Last adjusted by 87th Amendment

Sources: Indian Polity, M. Laxmikanth, Parliament, p.224; Indian Polity, M. Laxmikanth, Delimitation Commission of India, p.530

3. The Delimitation Commission of India (intermediate)

To understand the composition of the Lok Sabha, we must first understand Delimitation. In simple terms, it is the process of drawing boundaries for territorial constituencies so that every Member of Parliament represents a roughly equal number of voters. This ensures the democratic principle of 'One Vote, One Value.' According to Article 82 of the Constitution, the Parliament is required to enact a Delimitation Act after every census to readjust the allocation of seats to the states and the division of each state into constituencies Indian Polity, M. Laxmikanth (7th ed.), Delimitation Commission of India, p. 530.

However, a significant challenge arose in the 1970s: states that successfully implemented population control measures feared they would lose seats in Parliament compared to states with high birth rates. To address this, the 42nd Amendment Act (1976) froze the allocation of seats in the Lok Sabha based on the 1971 Census until the year 2000. This freeze was later extended by the 84th Amendment Act (2001) until the first census after 2026. This means that while the population has grown and shifted significantly, the total number of seats each state has in the Lok Sabha remains anchored to 1971 data to avoid penalizing states for population management Indian Polity, M. Laxmikanth (7th ed.), Delimitation Commission of India, p. 530.

There is a crucial distinction between allocating seats and drawing boundaries. While the total number of seats per state is frozen at 1971 levels, the boundaries within a state can still be adjusted. The 87th Amendment Act (2003) provided that the delimitation of internal constituency boundaries and the reservation of seats for SCs and STs should be based on the 2001 Census. This ensures that even if a state's total seat count is fixed, the voters within that state are distributed as fairly as possible across its constituencies Indian Polity, M. Laxmikanth (7th ed.), Delimitation Commission of India, p. 530.

Sources: Indian Polity, M. Laxmikanth (7th ed.), Delimitation Commission of India, p.529-530

4. Reservation of Seats for SCs and STs (intermediate)

To ensure that historically disadvantaged groups have a meaningful voice in the highest law-making body, the Indian Constitution provides for the Reservation of Seats for Scheduled Castes (SCs) and Scheduled Tribes (STs). Unlike a 'separate electorate' where only members of a specific community vote for their own representative—a concept rejected by our founding fathers—India follows a system of reserved constituencies. In these areas, while only a person belonging to the SC or ST community can contest the election, all voters in that constituency, regardless of their caste, cast their vote to elect the representative NCERT Class IX, Electoral Politics, p.40.

The allocation of these seats is governed by Article 330 for the Lok Sabha and Article 332 for State Legislative Assemblies M. Laxmikanth, Special Provisions Relating to Certain Classes, p.559. The logic behind the number of reserved seats is strictly mathematical: seats are reserved in a state in proportion to their population in that state. Currently, in the Lok Sabha, 84 seats are reserved for SCs and 47 for STs (as of 2019 figures) NCERT Class XI, Election and Representation, p.64. This ensures that the demographic weight of these communities is reflected in Parliament.

The responsibility of deciding which specific constituencies will be reserved falls to the Delimitation Commission, an independent body appointed by the President. While the total number of seats in the Lok Sabha is currently frozen based on the 1971 Census to support population control goals, the 87th Amendment Act of 2003 allowed the Delimitation Commission to readjust the boundaries and re-identify which seats should be reserved based on the 2001 Census figures M. Laxmikanth, Delimitation Commission of India, p.530. This ensures that if a community's population shifts geographically, the reservation follows them.

Initially, under Article 334, these reservations were intended to last only for 10 years. However, recognizing that the goal of social integration is an ongoing process, Parliament has consistently extended this period through various Constitutional Amendments. The 104th Amendment Act (2019) is the most recent, extending the reservation for SCs and STs in the Lok Sabha and State Assemblies until 2030.

Sources: Indian Polity, M. Laxmikanth(7th ed.), Special Provisions Relating to Certain Classes, p.559; Indian Polity, M. Laxmikanth(7th ed.), Delimitation Commission of India, p.530; Indian Constitution at Work, Political Science Class XI (NCERT 2025 ed.), ELECTION AND REPRESENTATION, p.64-65; Democratic Politics-I. Political Science-Class IX . NCERT(Revised ed 2025), ELECTORAL POLITICS, p.40

5. Comparison: Rajya Sabha Seat Allocation (intermediate)

In any federal system, the Upper House exists to represent the constituent units (States). However, how these seats are distributed varies. In India, the allocation of seats in the Rajya Sabha is primarily based on the population of each state. This is a departure from the 'Symmetrical Federalism' seen in the United States, where every state—regardless of size—gets exactly two seats in the Senate. In India, we follow 'Asymmetrical Federalism' to ensure that larger populations have a proportionately stronger voice in the federal chamber D. D. Basu, Introduction to the Constitution of India, The Union Legislature, p.242. The specific number of seats assigned to each State and Union Territory is listed in the Fourth Schedule of the Constitution. Currently, the Rajya Sabha has a maximum strength of 250 members: 238 are representatives of the States and UTs (elected indirectly by State Legislative Assemblies), and 12 are nominated by the President for their excellence in Literature, Science, Art, and Social Service M. Laxmikanth, Indian Polity, Parliament, p.267. To maintain political stability and support national population control policies, the seat allocation for states was frozen based on the 1971 Census figures. Under the 42nd Amendment Act (1976) and later the 84th Amendment Act (2001), this freeze ensures that states which successfully reduced their population growth are not 'punished' by losing seats in Parliament. This freeze is set to remain in place until the first census after the year 2026 M. Laxmikanth, Indian Polity, Delimitation Commission of India, p.530.

Feature	Indian Rajya Sabha	American Senate
Basis of Representation	Proportional to Population	Equality of States (2 per state)
Nominated Members	12 (by the President)	None
Election Method	Indirect (by MLAs)	Direct (by the People)

Sources: Introduction to the Constitution of India, D. D. Basu (26th ed.), The Union Legislature, p.242; Indian Polity, M. Laxmikanth (7th ed.), Parliament, p.267; Indian Polity, M. Laxmikanth (7th ed.), Delimitation Commission of India, p.530

6. The 42nd Amendment and the 1971 Census Freeze (exam-level)

In a truly representative democracy, the number of people represented by each Member of Parliament (MP) should be roughly equal. To ensure this, Article 82 of the Constitution mandates that after every census, the allocation of seats in the Lok Sabha to the states and the division of each state into territorial constituencies must be readjusted Laxmikanth, Delimitation Commission of India, p.530. However, if we strictly followed this after every census, states that successfully implemented family planning would see their population share decrease, leading to a loss of political power in Parliament. This created a 'disincentive' for population control. To address this, the 42nd Amendment Act of 1976 froze the allocation of seats in the Lok Sabha and the State Legislative Assemblies based on the 1971 Census figures. The logic was simple: states should not be 'punished' with fewer seats for performing well on national population goals NCERT Class XI, Legislature, p.106. While originally intended to last until the year 2000, this freeze was later extended by the 84th Amendment Act of 2001 for another 25 years—meaning the seat count remains fixed until the first census taken after 2026 Laxmikanth, State Legislature, p.336. It is vital to distinguish between total seats and internal boundaries. While the total number of seats for each state is still stuck in 1971, the 87th Amendment Act of 2003 allowed for the 'rationalization' or redrawing of constituency boundaries within a state based on the 2001 Census. This ensures that even if a state's total seat count doesn't change, the population is distributed fairly across its internal constituencies Laxmikanth, Delimitation Commission of India, p.530.

Sources: M. Laxmikanth, Indian Polity (7th ed.), Delimitation Commission of India, p.530; NCERT Class XI, Indian Constitution at Work (2025 ed.), Legislature, p.106; M. Laxmikanth, Indian Polity (7th ed.), State Legislature, p.336

7. 84th and 87th Amendments: The 2026 Deadline (exam-level)

To understand why the 84th and 87th Amendments are so pivotal, we must first look at a fundamental tension in Indian democracy: Proportional Representation vs. Population Control. Under Article 82, the Constitution originally intended for the number of seats in the Lok Sabha to be readjusted after every census to ensure each state’s representation remained proportional to its population. However, by the 1970s, it became clear that states successfully implementing family planning (mostly in the South) would lose seats, while those with high birth rates (mostly in the North) would gain more political power. To prevent this "demographic penalty," the 42nd Amendment (1976) froze the seat allocation at 1971 levels until the year 2000 Indian Polity, M. Laxmikanth(7th ed.), Parliament, p.224.

When the year 2000 arrived, the population growth rates across states were still widely divergent. Consequently, the 84th Amendment Act of 2001 extended this freeze for another 25 years—meaning the state-wise distribution of seats will remain fixed until the first census taken after the year 2026. This amendment also allowed for the delimitation (readjustment of boundaries) of constituencies within a state so that each constituency has a roughly equal population, initially using the 1991 census data Indian Polity, M. Laxmikanth(7th ed.), State Legislature, p.336.

The 87th Amendment Act of 2003 refined this process further. It shifted the data source for internal delimitation from the 1991 census to the 2001 census. It is vital to distinguish between two different uses of census data today:

Feature	Current Status	Governing Law/Amendment
Total Seats per State	Fixed at 1971 Census levels	84th Amendment (Freeze until 2026)
Internal Boundaries	Fixed at 2001 Census levels	87th Amendment
SC/ST Reservations	Fixed at 2001 Census levels	87th Amendment & Delimitation Act, 2002

Essentially, while the map inside a state can be redrawn to balance voters, the total number of MPs a state sends to Delhi cannot change until the 2026 deadline passes. This makes the upcoming post-2026 census (likely the 2031 census) a massive political milestone, as it will likely lead to a significant increase in the total number of seats in Parliament Indian Polity, M. Laxmikanth(7th ed.), Delimitation Commission of India, p.530.

Sources: Indian Polity, M. Laxmikanth(7th ed.), Parliament, p.224; Indian Polity, M. Laxmikanth(7th ed.), State Legislature, p.336; Indian Polity, M. Laxmikanth(7th ed.), Delimitation Commission of India, p.530

8. Solving the Original PYQ (exam-level)

This question brings together your understanding of Article 82 and the Delimitation Commission. As you have learned in your modules, while the Constitution originally intended for seat distribution to change after every census, the 42nd Amendment Act (1976) introduced a significant freeze to support family planning and population control goals. By freezing the allocation of seats based on the 1971 Census, the government ensured that states successfully implementing population control measures would not lose their political representation in the Lok Sabha. This policy was later extended by the 84th Amendment Act (2001), which mandated that these 1971 figures remain the standard until the first census after 2026.

To arrive at the correct answer, (A) 1971, you must distinguish between allocation (the total number of seats a state receives) and delimitation (how the internal boundaries of those seats are drawn). While the 87th Amendment Act (2003) updated the census year for internal delimitation to 2001, it explicitly left the 1971-based seat allocation untouched. Therefore, even though 2001 is a "modern" census used for internal boundary adjustments to ensure equal population within a state's constituencies, the total number of seats assigned to each state remains anchored to the 1971 data to maintain inter-state parity.

UPSC often uses (D) 2001 as a trap because students frequently confuse the redrawing of boundaries with the total allocation of seats. Options (B) 1981 and (C) 1991 are simple decoys; no major constitutional amendment has ever used these specific census years as a base for parliamentary seat allocation. As a sharp aspirant, always ask yourself: "Am I looking at the count of seats or the shape of the constituency?" This distinction is the key to mastering this concept as explained in Indian Polity by M. Laxmikanth.