If the number of seats allocated to a state in the Lok Sabha is 42, then the number of seats reserved for the Scheduled Castes in that state will be

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

Welcome to your first step in mastering the structure of the Indian Parliament! To understand the Lok Sabha (the House of the People), we must start with Article 81 of the Constitution. Think of this article as the blueprint that decides how many members can sit in the House and how they are distributed across the vast geography of India.

The Constitution sets a "ceiling" or maximum limit on the strength of the Lok Sabha to ensure it doesn't become too unwieldy. As per the current legal framework, the maximum strength is fixed at 550. This is divided into two categories: up to 530 members representing the States and up to 20 members representing the Union Territories M. Laxmikanth, Indian Polity, Chapter 22, p. 223. It is important to note that previously, the President could nominate two members from the Anglo-Indian community, but this provision was discontinued by the 104th Constitutional Amendment Act, 2019.

To ensure fairness, Article 81 follows two main principles of proportionality:

• Between States: The number of seats is allotted to each state such that the ratio between the number of seats and its population is (as far as practicable) the same for all states. This ensures that a voter in Uttar Pradesh and a voter in Kerala have roughly the same "weight" in the House.
• Within a State: Each state is divided into territorial constituencies such that the ratio between the population of each constituency and the number of seats allotted to it is uniform throughout the state M. Laxmikanth, Indian Polity, Chapter 32, p. 530.

Category	Maximum Permissible (Article 81)	Present Strength (Actual)
Representatives of States	530	524
Representatives of UTs	20	19
Total	550	543

Currently, these seat allocations are "frozen" based on the 1971 Census. Under the 84th Amendment Act of 2001, this total number of seats will not be changed until the first census taken after the year 2026 M. Laxmikanth, Indian Polity, Chapter 32, p. 530. This was done to encourage states to lead population control measures without the fear of losing political representation.

Sources: M. Laxmikanth, Indian Polity, Chapter 22: Parliament, p.223; M. Laxmikanth, Indian Polity, Chapter 32: Election Laws, p.530

2. Reservation of Seats for SCs and STs (Article 330) (basic)

In our previous step, we looked at how seats are distributed across states. Now, let’s focus on Article 330, which ensures that the Lok Sabha isn't just a house of the majority, but a house that reflects India’s social diversity. While India generally follows a territorial representation system where the candidate with the most votes wins Laxmikanth, Parliament, p.225, the Constitution makers realized that certain groups—the Scheduled Castes (SC) and Scheduled Tribes (ST)—might never get elected in a purely competitive system due to historical social and economic disadvantages NCERT Class XI, Election and Representation, p.64.

Under Article 330, seats are reserved in the Lok Sabha based on the proportion of their population in the respective states. It is important to remember that these are not 'separate electorates' (where only SC/ST voters would vote for their candidates); instead, we have a joint electorate. This means that while only a member of the SC or ST community can contest from a reserved seat, everyone in that constituency votes to choose the winner. Currently, out of 543 elected seats, 84 are reserved for SCs and 47 for STs NCERT Class XI, Election and Representation, p.64.

Who decides which specific constituency becomes a 'reserved' one? This task falls to the Delimitation Commission, an independent body appointed by the President. They look at population patterns: for SCs, they look for constituencies with a high proportion of SC population, whereas for STs, they look for areas where their population is most concentrated NCERT Class XI, Election and Representation, p.65.

Article	Provision
Article 330	Reservation for SCs and STs in the Lok Sabha
Article 332	Reservation for SCs and STs in the State Legislative Assemblies
Article 334	Sets the time limit for these reservations (originally 10 years, extended periodically)

Sources: Indian Polity, M. Laxmikanth, Parliament, p.225; Indian Constitution at Work, NCERT Class XI, Election and Representation, p.64-65

3. Delimitation Commission and Seat Freezing (intermediate)

To ensure that every person's vote carries roughly the same weight, constituency boundaries must be redrawn as the population grows and shifts. This process is called delimitation. In India, this task is performed by the Delimitation Commission, a high-powered statutory body established by the Parliament. This Commission is uniquely powerful: its orders have the force of law and cannot be challenged in any court. Once its reports are laid before the Lok Sabha or State Assemblies, no modifications are permitted M. Laxmikanth, Indian Polity, Delimitation Commission of India, p.530. Historically, delimitation happened after every census. However, a significant shift occurred in the 1970s. States that successfully implemented population control measures feared they would lose seats in Parliament compared to states with higher birth rates. To address this, the 42nd Amendment Act of 1976 'froze' the total number of seats in the Lok Sabha and State Assemblies at the 1971 census level until the year 2000. This freeze was later extended to 2026 by the 84th Amendment Act of 2001 to continue encouraging population-limiting measures M. Laxmikanth, Indian Polity, State Legislature, p.336. It is important to distinguish between the total number of seats and the boundaries of constituencies. While the total seats remain frozen at 1971 levels, the internal boundaries within a state can be redrawn to balance population changes. Initially, the 84th Amendment (2001) allowed this internal rationalization based on the 1991 census. This was later updated by the 87th Amendment Act of 2003, which mandated that the redrawing of boundaries and the refixing of reserved seats (for SCs and STs) be based on the 2001 census figures M. Laxmikanth, Indian Polity, Parliament, p.225.

Sources: Indian Polity, M. Laxmikanth, Delimitation Commission of India, p.530; Indian Polity, M. Laxmikanth, Delimitation Commission of India, p.533; Indian Polity, M. Laxmikanth, Parliament, p.225; Indian Polity, M. Laxmikanth, State Legislature, p.336

4. Comparison: Rajya Sabha Composition (Article 80) (intermediate)

At the heart of India's federal structure is Article 80 of the Constitution, which defines the composition of the Rajya Sabha (the Council of States). Unlike the Lok Sabha, which represents the people directly, the Rajya Sabha represents the States and Union Territories (UTs), acting as a revising chamber to ensure that regional interests are balanced against national imperatives. Currently, the Rajya Sabha has 245 members, though the Constitution permits a maximum strength of 250. This membership is divided into two categories: 233 representatives of the States and UTs, and 12 members nominated by the President of India Laxmikanth, Parliament, p.223.

The allocation of seats to each State and Union Territory is not uniform; instead, it is primarily based on population. This is a significant departure from the American system (the Senate), where every state has equal representation regardless of size. In India, the specific number of seats assigned to each state is listed in the Fourth Schedule of the Constitution. For example, a populous state like Uttar Pradesh has many more seats than a smaller state like Goa NCERT Class VIII, The Parliamentary System, p.142.

The election process for these representatives is indirect. They are elected by the elected members of the State Legislative Assemblies (MLAs) using the system of proportional representation by means of the single transferable vote. This ensures that even minority parties in the state assemblies can have a voice in the Upper House if they have sufficient numbers. The 12 nominated members, on the other hand, are chosen for their special knowledge or practical experience in four specific fields: Literature, Science, Art, and Social Service D.D. Basu, Introduction to the Constitution of India, p.519.

Feature	Details for Rajya Sabha
Maximum Strength	250 (238 elected + 12 nominated)
Electoral College	Elected members of State Legislative Assemblies (MLAs)
Allocation Basis	Population of the respective State/UT
Constitutional Schedule	Fourth Schedule

Sources: Laxmikanth, M. Indian Polity, Parliament, p.223; Exploring Society: India and Beyond, NCERT Class VIII, The Parliamentary System: Legislature and Executive, p.142; D. D. Basu, Introduction to the Constitution of India, Tables, p.519

5. Reservation in Local Bodies (Articles 243D & 243T) (intermediate)

While we often focus on reservation in Parliament, the most transformative application of the reservation policy occurs at the grassroots level through Articles 243D (Panchayats) and 243T (Municipalities). These articles were introduced by the 73rd and 74th Constitutional Amendment Acts of 1992 to ensure that local governance is truly representative of the social fabric of India. Unlike the Lok Sabha, where reservations are limited to Scheduled Castes (SC) and Scheduled Tribes (ST), local body reservations introduce a landmark mandate for gender-based representation.

Under these provisions, seats are reserved for SCs and STs in every local body in proportion to their population in that area Introduction to the Constitution of India, D. D. Basu, PANCHAYATS, p.319. For example, if a district has a 20% ST population, 20% of the Panchayat seats must be reserved for them. Crucially, the Constitution mandates that not less than one-third (33%) of the total number of seats must be reserved for women. This isn't just a separate quota; it also applies within the SC/ST quotas, meaning one-third of the seats reserved for SCs must be occupied by SC women Indian Constitution at Work, NCERT Class XI, LOCAL GOVERNMENTS, p.184.

One of the most powerful features of these articles is that reservation is not limited to ordinary members. It extends to the offices of Chairpersons (Sarpanchs or Mayors) at all levels Indian Polity, M. Laxmikanth, Panchayati Raj, p.388. This ensures that marginalized groups don't just have a seat at the table but also hold the gavel of leadership. While SC/ST and women's reservations are mandatory, the Constitution gives State Legislatures the discretionary power to provide for reservations for Backward Classes (OBCs) if they deem it necessary.

Type of Reservation	Nature	Basis/Quantum
Scheduled Castes & Tribes	Mandatory	Proportional to population in the local area.
Women	Mandatory	At least 1/3rd (including within SC/ST quotas).
Backward Classes (OBC)	Discretionary	Decided by individual State Laws.

Sources: Introduction to the Constitution of India, D. D. Basu, PANCHAYATS, p.319; Indian Constitution at Work, Political Science Class XI (NCERT), LOCAL GOVERNMENTS, p.184; Indian Polity, M. Laxmikanth, Panchayati Raj, p.388

6. State-specific Lok Sabha Seat Data (exam-level)

To understand how the Lok Sabha is composed, we must look at how seats are distributed across India's vast geography. The Constitution mandates that seats are allotted to each state based on its population, ensuring that the ratio between seats and population remains consistent across the country. This principle of 'one person, one vote, one value' ensures that a voter in West Bengal has roughly the same representation as a voter in Tamil Nadu Laxmikanth, M. Indian Polity, Parliament, p.224. However, to protect the political weight of states that successfully implemented population control, the number of seats has been 'frozen' based on the 1971 Census figures, a freeze that is currently set to last until the first census after 2026 NCERT Class XI, Indian Constitution at Work, LEGISLATURE, p.107. Beyond just the total count, the Lok Sabha composition includes reserved seats for Scheduled Castes (SC) and Scheduled Tribes (ST). This isn't a separate electorate; everyone in the constituency votes, but only candidates from these communities can contest. Nationally, 84 seats are reserved for SCs and 47 for STs NCERT Class VIII, Exploring Society, Universal Franchise and India’s Electoral System, p.129. At the state level, these numbers vary significantly based on the local demographic profile. For instance, West Bengal is a major political unit with 42 Lok Sabha seats. Following the Delimitation Order of 2008, 10 of these are reserved for SCs and 2 for STs, reflecting the specific population proportions of those communities within the state.

Feature	Provision/Requirement
Allocation Basis	Population (Ratio must be uniform across states).
Small State Exception	The uniform ratio rule doesn't apply to states with population < 6 million.
Reservation Logic	Based on the proportion of SC/ST population in the State to the total population.

Sources: Laxmikanth, M. Indian Polity, Parliament, p.224; NCERT Class XI, Indian Constitution at Work, LEGISLATURE, p.107; NCERT Class VIII, Exploring Society, Universal Franchise and India’s Electoral System, p.129

7. Solving the Original PYQ (exam-level)

This question bridges your understanding of Article 330 of the Constitution and the functional role of the Delimitation Commission. As you have just learned, seats for Scheduled Castes (SC) in the Lok Sabha are not allocated arbitrarily; they must be in the same proportion to the total number of seats as the SC population is to the total population of the state. When you encounter a specific number like "42 seats," your first step is to identify the state. Under the Delimitation of Parliamentary and Assembly Constituencies Order, West Bengal is the only state allocated exactly 42 seats, making it the hidden subject of this question.

To arrive at Option (D) 6, you must navigate the historical context of seat allocation. While the current 2008 Delimitation Order has revised West Bengal's SC reservation to 10 seats, this classic PYQ refers to the earlier statutory allocation where 6 seats were reserved. The coaching tip here is to recognize that UPSC often tests your knowledge of specific state-wise data. By identifying the state as West Bengal, you move beyond generic math and apply the specific figures designated for that region's demographic profile as defined by the commission at the time of the query.

UPSC frequently uses distractor options that look mathematically "clean." Option (A) 21 is a classic 50% trap, intended to confuse you with the general judicial ceiling on total reservations. Options (B) 14 and (C) 7 are fractional traps (one-third and one-sixth, respectively) designed to appeal to students who are guessing based on simple ratios rather than specific Constitutional and statutory figures. Always remember that seat reservation is a precise data point derived from census figures, not a standard mathematical round-off.