Delimitation of constituencies and determination of constituencies reserved for SCs and STs are done

1. The Constitutional Framework of Elections (Article 324) (basic)

India's electoral system is built on the bedrock of Article 324 of the Constitution. Think of this article as the "fountainhead" that ensures the democratic process remains untainted by political interference. It vests the superintendence, direction, and control of elections in an independent, permanent body: the Election Commission of India (ECI) Indian Polity, Election Commission, p.419. This independence is crucial because, without a neutral umpire, the fairness of the "great Indian poll" would be under constant shadow. The ECI is a multi-member body consisting of a Chief Election Commissioner (CEC) and two Election Commissioners, all appointed by the President of India Indian Polity, Elections, p.573.

It is vital to distinguish which elections fall under this constitutional umbrella. The ECI manages high-stakes national and state elections, but it does not handle local grassroots elections. This distinction is a common point of confusion for many students.

Election Type	Responsible Body	Constitutional Basis
Parliament (Lok Sabha/Rajya Sabha)	Election Commission of India	Article 324
State Legislatures (Assemblies/Councils)	Election Commission of India	Article 324
President & Vice-President	Election Commission of India	Article 324
Panchayats & Municipalities	State Election Commission	Articles 243K & 243ZA

While Article 324 provides the power, the "how-to" of elections is governed by laws passed by Parliament. The two most important pillars are the Representation of the People Act (RPA), 1950, and the RPA, 1951. The 1950 Act is particularly important for our journey into delimitation because it deals with the allocation of seats and the delimitation (boundary-fixing) of constituencies Indian Polity, Election Laws, p.579. It also handles the preparation of electoral rolls and voter qualifications A Brief History of Modern India, First General Elections, p.629. Essentially, the 1950 Act sets the stage (the map and the voters), while the 1951 Act focuses on the play (the actual conduct of the poll).

Sources: Indian Polity, M. Laxmikanth, Election Commission, p.419; Indian Polity, M. Laxmikanth, Elections, p.573; Indian Polity, M. Laxmikanth, Election Laws, p.579; A Brief History of Modern India, Rajiv Ahir (Spectrum), First General Elections, p.629

2. Composition of Legislatures and Seat Allocation (intermediate)

To understand how the Delimitation Commission operates, we must first look at the 'containers' it is tasked with filling: the Lok Sabha and the State Legislative Assemblies. The Constitution provides a rigid framework for their composition to ensure a balance between population-based representation and national stability. Under Article 81, the maximum strength of the Lok Sabha is fixed at 550 members (530 from States and 20 from Union Territories), while Article 170 mandates that State Legislative Assemblies generally consist of 60 to 500 members, depending on the state's population Indian Polity, Parliament, p.223 Indian Polity, State Legislature, p.335. Historically, seat allocation was meant to be revised after every census to reflect population shifts. However, this created a dilemma: states that successfully implemented population control measures feared losing political weight in Parliament. To address this, the 84th Constitutional Amendment Act of 2001 froze the total number of seats in the Lok Sabha and State Assemblies based on the 1971 Census until the year 2026 Indian Polity, Delimitation Commission of India, p.530. This ensures that the "political map" of India remains stable while the Delimitation Commission focuses on redrawing internal boundaries within states to ensure each constituency has a roughly equal population. Beyond just numbers, the Commission must ensure social equity through Seat Reservation. Under Articles 330 and 332, seats are reserved for Scheduled Castes (SCs) and Scheduled Tribes (STs) in proportion to their population in the state. This is not a random assignment; the Commission meticulously identifies constituencies with high SC/ST concentrations to fulfill these constitutional mandates.

Feature	Lok Sabha	Legislative Assembly
Max Strength	550	500
Min Strength	N/A	60 (with exceptions like Goa/Sikkim)
Current Seat Base	1971 Census	1971 Census

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

3. Connected Concept: The Freeze on Seats (84th & 87th Amendments) (exam-level)

To understand the current electoral map of India, we must look at the Population Control Paradox. In the 1970s, the Union government realized that if seats in the Lok Sabha were increased after every census based on population growth, states that successfully implemented family planning would be 'punished' with fewer seats, while states with high birth rates would be 'rewarded' with more political power. To prevent this, the 42nd Amendment Act of 1976 froze the total number of seats in the Lok Sabha and State Assemblies at the 1971 Census levels until the year 2000 Laxmikanth, M. Indian Polity, State Legislature, p.336.

When this freeze was about to expire, the 84th Amendment Act of 2001 was passed. It extended the ban on increasing the total number of seats for another 25 years—meaning the total number of seats will remain unchanged until the first census taken after the year 2026 (likely the 2031 census) Laxmikanth, M. Indian Polity, Parliament, p.224. However, there was a secondary problem: while the total number of seats was fixed, the population within states had shifted significantly from rural to urban areas. This led to 'malapportionment,' where one city MP might represent 3 million people while a rural MP represented only 1 million.

To fix this internal imbalance without changing the total seat count, the 84th Amendment (2001) and later the 87th Amendment Act of 2003 allowed for a 'Rationalization' or redrawing of internal boundaries. While the 84th Amendment originally suggested using the 1991 census for this purpose, the 87th Amendment updated this to the 2001 Census Laxmikanth, M. Indian Polity, Delimitation Commission of India, p.530. This ensures that while a state like Tamil Nadu keeps the same number of MPs, the boundaries within Tamil Nadu are drawn fairly based on more recent population distributions.

Feature	Total Number of Seats	Internal Boundary Redrawing
Base Census Year	1971 Census	2001 Census (per 87th Amendment)
Frozen Until	Post-2026 Census	Updated periodically as per Law

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

4. Connected Concept: Judicial Immunity in Electoral Matters (intermediate)

In the world of Indian democracy, the schedule of an election is sacrosanct. To ensure that the electoral process isn't paralyzed by endless litigation, the Constitution provides a robust "Judicial Shield" or Judicial Immunity regarding the redrawing of constituency boundaries. Imagine if every time a boundary was moved by a few kilometers, a local resident filed a lawsuit; the election cycle would come to a grinding halt. To prevent this, Article 329(a) of the Constitution explicitly states that the validity of any law relating to the delimitation of constituencies or the allotment of seats to such constituencies cannot be called into question in any court of law Introduction to the Constitution of India, PANCHAYATS, p.321.

This immunity is not just limited to Parliamentary or Assembly elections. Similar protections are extended to local governance. Under Article 243K (for Panchayats) and Article 243ZA (for Municipalities), the courts are barred from interfering in matters of delimitation or the allotment of seats Introduction to the Constitution of India, MUNICIPALITIES AND PLANNING COMMITTEES, p.325. The logic remains the same: finality is essential for stability. Once the Delimitation Commission publishes its orders in the Gazette of India, they carry the force of law. They are laid before the Lok Sabha or the State Legislative Assembly, but crucially, neither the legislature nor the judiciary has the power to modify or strike down these orders.

However, it is important to distinguish this from other electoral disputes. While the process of drawing the map is immune, the outcome of a specific election can still be challenged. For instance, an election to a Panchayat or Municipality can be questioned through an election petition presented to a specific authority prescribed by the State Legislature Introduction to the Constitution of India, PANCHAYATS, p.321. Furthermore, the immunity of the Delimitation Commission is unique; it differs from the election of the President or Vice-President, where the Supreme Court actually holds exclusive and final jurisdiction to decide on doubts and disputes Introduction to the Constitution of India, The Union Executive, p.209.

Matter	Judicial Intervention?	Relevant Article
Delimitation of Constituencies	Barred (No jurisdiction)	Art. 329(a) / 243K / 243ZA
Presidential Election Disputes	Allowed (Exclusive to Supreme Court)	Art. 71
Conduct of specific Election	Allowed (Via Election Petition)	Art. 329(b)

Sources: Introduction to the Constitution of India, PANCHAYATS, p.321; Introduction to the Constitution of India, MUNICIPALITIES AND PLANNING COMMITTEES, p.325; Introduction to the Constitution of India, The Union Executive, p.209

5. The Delimitation Commission: Structure and Purpose (exam-level)

The Delimitation Commission is a high-powered, independent body tasked with the 'readjustment' of electoral boundaries to ensure the democratic principle of 'one vote, one value.' Under Article 82 of the Constitution, Parliament enacts a Delimitation Act after every census to define the authority and manner in which this process occurs. Its primary purpose is to redraw the boundaries of Parliamentary and Assembly constituencies so that each seat represents a roughly equal population, preventing any single region from being over-represented or under-represented as populations shift over time Indian Polity, M. Laxmikanth(7th ed.) | State Legislature | p.335.

The structure of the Commission is carefully designed to maintain neutrality and expertise. It is appointed by the President of India and typically functions as a three-member body consisting of:

• A Chairperson, who must be a serving or retired Judge of the Supreme Court.
• The Chief Election Commissioner (or an Election Commissioner nominated by them) as an ex-officio member.
• The State Election Commissioner of the respective State or Union Territory as an ex-officio member Indian Polity, M. Laxmikanth(7th ed.) | Delimitation Commission of India | p.531.

To provide local political context, the Commission also includes Associate Members (usually five MPs and five MLAs from the state being delimited). However, these associate members do not have the power to vote or sign the final report.

Beyond redrawing maps, the Commission has the critical mandate of determining the quota of reserved seats for Scheduled Castes (SCs) and Scheduled Tribes (STs) based on their population proportions in each state. A unique feature of the Commission is its legal finality: its orders have the force of law and cannot be challenged in any court. This ensures that the electoral cycle is not disrupted by litigation, providing stability to the democratic process Indian Polity, M. Laxmikanth(7th ed.) | Delimitation Commission of India | p.530.

Sources: Indian Polity, M. Laxmikanth(7th ed.), State Legislature, p.335; Indian Polity, M. Laxmikanth(7th ed.), Delimitation Commission of India, p.531; Indian Polity, M. Laxmikanth(7th ed.), Delimitation Commission of India, p.530

6. Determining Reserved Seats for SCs and STs (intermediate)

In our democratic setup, the Delimitation Commission plays a pivotal role in ensuring that the constitutional promise of political reservation is realized. The primary objective is to guarantee that Scheduled Castes (SCs) and Scheduled Tribes (STs) have an adequate voice in the legislature. This is governed by specific constitutional mandates: Article 330 reserves seats in the Lok Sabha, while Article 332 does the same for the State Legislative Assemblies Indian Polity, M. Laxmikanth (7th ed.), Special Provisions Relating to Certain Classes, p.559.

The process of determining these seats involves two critical steps. First, the quota of reserved seats in a state is fixed based on the proportion of SC or ST population to the total population of that state. For instance, if Scheduled Castes constitute 15% of a state's population, roughly 15% of the seats in that state are reserved for them Introduction to the Constitution of India, D. D. Basu (26th ed.), PANCHAYATS, p.319. Second, the Commission identifies the specific geographic constituencies to be reserved. For Scheduled Tribes, seats are generally reserved in areas where their population is most concentrated. For Scheduled Castes, the Commission looks for areas with a high SC population but also ensures these reserved seats are distributed across different regions of the state Indian Constitution at Work, Political Science Class XI (NCERT 2025 ed.), ELECTION AND REPRESENTATION, p.65.

It is a unique feature of the Indian system that while the right to contest in these reserved constituencies is limited to members of the SC/ST communities, the entire electorate (voters of all categories) in that constituency participates in the election. Furthermore, to ensure the stability of the electoral process, the decisions of the Delimitation Commission regarding these boundaries and reservations carry the force of law and are protected from being challenged in any court of law.

Sources: Indian Polity, M. Laxmikanth (7th ed.), Special Provisions Relating to Certain Classes, p.559; Introduction to the Constitution of India, D. D. Basu (26th ed.), PANCHAYATS, p.319; Indian Constitution at Work, Political Science Class XI (NCERT 2025 ed.), ELECTION AND REPRESENTATION, p.65

7. Solving the Original PYQ (exam-level)

Now that you have mastered the constitutional framework of Indian elections, you can see how Article 82 and Article 170 bridge the gap between census data and democratic representation. The core logic here is neutrality and precision; the task of redrawing boundaries and calculating SC/ST seat quotas based on population proportions requires a specialized, high-powered body that operates outside the daily administrative scope of the Election Commission. This ensures that the principle of 'one vote, one value' is maintained through a dedicated legal mechanism after every census.

To arrive at the correct answer, you must distinguish between the conduct of elections and the structural blueprint of the electoral map. While the Election Commission (ECI) is the permanent body managing the voting process, the Delimitation Commission is the specific entity appointed by the President for the singular task of defining constituency limits. As we discussed in our concept sessions, this Commission’s orders have the force of law and cannot be challenged in any court, a unique status that confirms it as the primary authority. Therefore, (B) Delimitation Commission is the correct choice, even though the Chief Election Commissioner serves as an ex-officio member to provide expertise.

UPSC often uses Option (A) and Option (D) as traps to exploit the common misconception that the Election Commission handles every aspect of the electoral cycle. Do not be misled by the collaborative nature of these bodies; the legal mandate for 'determination' and 'delimitation' rests specifically with the Delimitation Commission, not the ECI. Furthermore, Option (C) is a distractor, as the Planning Commission (now replaced by NITI Aayog) focused on socio-economic development and had no constitutional role in defining electoral boundaries. ECI FAQ: Delimitation of Constituencies