💥Join UPSC 2027,2028 Mentorship (August Batch) + XFactor Notes & Microthemes PDF
Talk to Mentor

Civilsdaily

Login

GS Paper: GS3

  • Asgard Archaea and the Evolution of Complex Cells

    Why in the News?

    Recent research by IISc on Asgard archaea — the closest living relatives of eukaryotes — has shed new light on how simple prokaryotic cells evolved into complex eukaryotic cells with nuclei, cytoskeletons, and organelles.

    About Asgard Archaea:

    • Nature: Tiny microbes living in deep-sea mud and extreme environments.
    • Evolutionary Link: Closest relatives of eukaryotic cells (plants, animals, humans).
    • Importance: Help explain how simple prokaryotic cells (bacteria/archaea) evolved into complex eukaryotic cells.
    • Significance: Considered the “missing link” in the origin of complex life.

    Findings from Indian Institute of Science (IISc) Study:

    • Focus: Scientists studied a subgroup called Odinarchaeota.
    • Discovery: Found two FtsZ genes (most microbes have one) and a tubulin-like gene.
      • FtsZ1: Works like bacterial proteins → forms straight filaments and attaches to cell membranes.
      • FtsZ2: Builds spiral structures but needs helper proteins to stick to membranes.
    • Division of Labour: Cooperation of FtsZ1 and FtsZ2 shows early signs of cellular specialisation.
    • Clue for Evolution: Suggests Asgard microbes were already experimenting with primitive “cytoskeleton” systems, paving way for complex cells.
    [UPSC 2012] Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

    Options:

    (a) Hydrogen, Oxygen, Sodium

    (b) Carbon, Hydrogen, Nitrogen*

    (c) Oxygen, Calcium, Phosphorus

    (d) Carbon, Hydrogen, Potassium

     

  • Integrated Air Defence Weapon System (IADWS) 

    Why in the News?

    The DRDO has successfully conducted the maiden flight-tests of the Integrated Air Defence Weapon System (IADWS) off the coast of Odisha.

    Integrated Air Defence Weapon System (IADWS) 

    About the Indigenous Air Defence Weapon System (IADWS):

    • Overview: A multi-layered indigenous system developed to neutralise a wide spectrum of aerial threats.
    • Integration: Combines 3 components viz. Quick Reaction Surface-to-Air Missiles (QRSAM), Very Short Range Air Defence System (VSHORADS), and Directed Energy Weapon (DEW).
    • Control: All systems are networked through a Command-and-Control Centre developed by the Defence Research and Development Laboratory (DRDL), Hyderabad.

    Key Components of IADWS:

    1. QRSAM:
      • Short-range missile system for protecting moving Army armoured formations.
      • Range: 3–30 km.
      • Equipped with 360° surveillance and tracking radars.
      • Fully automated, mobile, and capable of “search on move” and “track on move.”
    2. VSHORADS:
      • Fourth-generation man-portable air defence system (MANPAD).
      • Range: 300 m – 6 km.
      • Targets include drones, UAVs, and low-altitude aerial threats.
      • Deployable across Army, Navy, and Air Force.
    3. Directed Energy Weapon (DEW):
      • Vehicle-mounted laser system.
      • Range: <3 km.
      • Proven in field trials against UAVs and drone swarms.

    Strategic Significance:

    • Multi-Layer Defence: Provides aerial protection up to 30 km against threats from drones to fighter jets.
    • Self-Reliance: Enhances indigenous capability, reducing dependence on imported defence systems.
    • National Security: Strengthens preparedness for Mission Sudarshan Chakra — India’s planned national air defence shield.
    • Technological Integration: Demonstrates India’s leap in combining missile and laser-based defence on a single platform.
    • Geostrategic Importance: Seen as a milestone in India’s path to advanced, self-reliant defence systems.
    [UPSC 2018] What is “Terminal High Altitude Area Defense (THAAD)”, sometimes seen in the news?

    Options:

    (a) An Israeli radar system

    (b) India’s indigenous anti-missile programme

    (c) An American anti-missile system*

    (d) A defence collaboration between Japan and South Korea

     

  • Nepal officially joins IBCA

    Why in the News?

    Nepal has officially joined the International Big Cat Alliance (IBCA), an India-led global initiative to protect seven species of big cats.

    About the International Big Cat Alliance (IBCA)

    • Overview: A global multi-country, multi-agency alliance of 95 countries (range and non-range) focused on conserving big cats and their habitats.
    • Launch: Proposed by PM Modi in 2019; officially launched in April 2023 on Project Tiger’s 50th anniversary.
    • Conservation Scope: Works to protect 7 species of big cats — tiger, lion, leopard, snow leopard, cheetah, jaguar, and puma.
    • Functions: Operates through advocacy, knowledge-sharing, eco-tourism promotion, and resource mobilisation.
    • Conflict Mitigation: Aims to reduce human–wildlife conflict and restore degraded habitats.
    • Institutional Structure:
      • Governance: Managed by a General Assembly, elected Council, and Secretariat headed by a Secretary-General.
      • Headquarters: Permanent base established in India following ratification of the HQ agreement.

    Global Participation

    • Membership: Includes 95 countries across Asia, Africa, the Americas, and Europe/Central Asia. Examples:
      • Asia: India, China, Nepal, Pakistan, Iran.
      • Africa: Kenya, Congo, Ghana.
      • Americas: Brazil, Ecuador, United States.
      • Europe/Central Asia: Russia, Kazakhstan.
    • Ratification: Bhutan, Eswatini, Cambodia, Guinea, India, Liberia, Nicaragua, Somalia, and Suriname have deposited ratification instruments.

    India’s Role:

    • Biodiversity Hub: India hosts 5 of the 7 big cats — tiger, lion, leopard, snow leopard, and cheetah — and holds 70% of global tiger population.
    • Funding: Government committed ₹150 crore for 2023–2028; mobilising international contributions.
    • Leadership: India sets global benchmarks in wildlife conservation and ecological stewardship, positioning itself as a leader in big cat protection.
    [UPSC 2024] Consider the following statements:

    1. Lions do not have a particular breeding season.

    2. Unlike most other big cats, cheetahs do not roar.

    3. Unlike male lions, male leopards do not proclaim their territory by scent marking.

    Which of the statements given above are correct?

    (a) 1 and 2 only * (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 2

     

  • Reforming the steel framework

    Introduction

    Independence Day speeches are often symbolic, but in 2025 the Prime Minister shifted focus to frontier technologies, semiconductors, clean energy, AI, quantum computing, and defence indigenisation. Unlike earlier years, this vision was paired with the acknowledgment that bureaucratic inertia and regulatory red tape remain India’s toughest hurdles. The central challenge is whether India’s governance structures can keep pace with its technological ambitions.

    Significance of the 2025 Speech by the Prime Minister 

    • Future focus: Strong emphasis on frontier areas like semiconductors, EVs, and jet engines.
    • Symbolic push: The PM asked if fighter jet engines should not be Indian-made.
    • Bold promise: India will shed dependency in two decades.
    • Data milestone: India is the largest per capita data consumer (32 GB), ahead of China and the US.

    India’s current position in technology and self-reliance

    • Strength in mid-tech: Success in fintech, data access, and digitisation
    • Emerging hubs: Bengaluru, Hyderabad, Pune, Gurugram drive high-tech growth.
    • Import dependency: India depends heavily on imports in semiconductors, defence hardware, AI hardware, and clean energy technologies.
    • Global presence: Firms like Nvidia and IBM rely on India’s talent pool, but domestic ecosystems remain thin.

    Bureaucratic Challenges that obstruct deep-tech ambition

    • Colonial bureaucratic legacy: The Westminster model prioritised control over innovation and accountability.
    • Rigid steel frame: The “steel frame” of the civil services designed to ensure subservience to colonial administrators remains rigid even a century after the Public Service Commission’s creation in 1926.
    • Unrealised reforms: The Veerappa Moily Committee (2005) suggested domain experts and ethics codes-still pending.
    • Lateral entry limits: Attempts at inducting experts face systemic resistance.

    Why are regulatory and judicial reforms critical?

    • Persistent red tape: The Deregulation Commission (2025) was set up to identify redundant compliance norms, but structural bottlenecks persist.
    • Judicial backlog: Slow dispute resolution and investment climate, affectshigh-tech sectors.
    • Comparative lessons:
      • US & China: Despite different models, both empower political leadership over bureaucracy to push national interests.
      • UK: Even Britain debates its bureaucratic model, Dominic Cummings under Boris Johnson pushed for external competition and greater ministerial control.

    How does this link to Viksit Bharat@2047?

    • Ambition vs. architecture: India’s goal of becoming a deep-tech powerhouse is contingent not just on financial investment but on restructuring governance.
    • Symbolic timing: The UPSC centenary in 2026 is a historic chance for overhaul.
    • Future-readiness: Without structural reform, Atmanirbhar Bharat may remain aspirational.

    Conclusion

    India’s ambition to lead in deep-tech must be matched with institutional reform. The PM’s 2025 speech acknowledged that Atmanirbharta is as much about fixing bureaucratic bottlenecks as building jet engines or quantum labs. The centenary of UPSC offers an opportune moment to align India’s governance with its 2047 goals.

    Value Addition
    Committees on Civil Service Reforms

    1. Santhanam Committee (1964)

    • Focus: Preventive corruption measures.
    • Key suggestion: Creation of the Central Vigilance Commission (CVC).

    2. Kothari Committee (1976)

    • Focus: Recruitment and exam structure of Civil Services.
    • Key suggestion: Recommended 3-stage exam (Prelims, Mains, Interview), which is still followed today.

    3. Satish Chandra Committee (1989)

    • Focus: Review of recruitment and selection.
    • Key suggestion: Increased emphasis on aptitude and ethics in recruitment.

    4. Hota Committee (2004)

    • Focus: Ethics, transparency, and performance.
    • Key suggestion: Right to Information, performance-linked incentives, citizen charters.

    5. Second Administrative Reforms Commission (ARC) – Veerappa Moily (2005–2009)

    Most comprehensive civil service reform report (15 volumes). Key suggestions:

    • Lateral entry of domain experts.
    • Code of Ethics & Code of Conduct.
    • Citizen-centric administration
    • Performance-based appraisal system.
    • Training in e-governance and modern management practices

    6. Punchhi Commission (2010) – on Centre-State relations

    • Relevant link: Stressed need for civil service neutrality in federal governance.

    7. Baswan Committee (2016)

    1. Focus: UPSC exam age and attempts.
    2. Key suggestion: Reduce maximum age for UPSC CSE (though not implemented).

    8. Current initiatives 

    • Lateral entry into Joint Secretary and Director-level posts.
    • Mission Karmayogi (2020): National Programme for Civil Services Capacity Building (NPCSCB) to train officers with competency-based framework.
    • Deregulation Commission (2025): Identifying and scrapping redundant compliances.

    Mapping Microthemes

    • GS Paper-II: Civil Service Reform, Regulation, Judiciary
    • GS Paper -III: Tech missions, Defence Indigenisation, Atmanirbhar Bharat
    • GS Paper -IV: Accountability, Ethics in governance

    PYQ Relevance

    [UPSC 2016] Civil Services “Traditional bureaucratic structure and culture have hampered the process of socio-economic development in India.” Comment.

    Linkage: PM Modi’s Independence Day 2025 address highlighted that despite India’s technological advances, the colonial-era bureaucratic “steel frame” continues to obstruct innovation, investment, and governance reforms. The traditional bureaucratic structure—designed for control rather than development—remains a bottleneck in achieving Atmanirbhar Bharat. Thus, the speech directly echoes the UPSC 2016 theme that outdated bureaucratic culture hampers socio-economic transformation.

  • Lunar Module Launch Vehicle (LMLV)

    Why in the News?

    The Indian Space Research Organisation (ISRO) is developing its heaviest-ever rocket, the Lunar Module Launch Vehicle (LMLV).

    About Lunar Module Launch Vehicle (LMLV):

    • Overview: India’s heaviest rocket under development by the Indian Space Research Organisation (ISRO).
    • Purpose: Designed mainly for lunar exploration, including India’s first human mission to the Moon by 2040.
    • Strategic Role: Replaces the Next Generation Launch Vehicle (NGLV) plan and will support India’s space station programme.
    • Scale: As tall as a 40-storey building, far larger than the current LVM-3.

    Key Features:

    • Payload Capacity: Can carry 80 tonnes to Low Earth Orbit (LEO) and 27 tonnes to the Moon, suitable for human-rated spacecraft.
    • Three-stage: Partially reusable super heavy-lift vehicle with:
      • First two stages using liquid propellants.
      • Third stage using cryogenic propellant.
      • Strap-on boosters taller than the entire LVM-3 rocket.
      • 27 engines in the first stage (core + boosters).
    • Timeline: Expected completion by 2035.
    • Indigenous Development: Conceived by ISRO within months; aligned with India’s long-term space exploration goals.

    Future Missions based on LMLV:

    • Human Lunar Mission (2040 target): Capable of carrying 18–20 tonne crew modules for India’s first astronaut landing on the Moon.
    • Bharatiya Antariksh Station (BAS): Will deploy heavy modules for India’s planned five-module space station by 2035.
    • Lunar Cargo Missions: Can transport ~27 tonnes to the Moon, supporting logistics and lunar infrastructure.
    • Deep Space Exploration: Its heavy-lift capacity could enable interplanetary missions in the 2040s, extending beyond lunar exploration.
    [UPSC 2018] With reference to India’s satellite launch vehicles, consider the following statements:

    1.PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites.

    2.Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.

    3.GSLV Mk III is a four-stage launch vehicle with the first and third stages using solid rocket motors, and the second and fourth stages using liquid rocket engines.

    Which of the statements given above is/are correct?

     

    Options: (a) 1 only* (b) 2 and 3 (c) 1 and 2 (d) 3 only

     

  • Simplified two-rate GST Structure

    Why in the News?

    • The Group of Ministers (GoM) on Rate Rationalisation has accepted the Centre’s proposal to simplify GST into a two-rate structure.
    • The recommendation will now be placed before the GST Council for final approval.

    https://www.thehindu.com/business/Economy/gom-on-rate-rationalisation-approves-centres-two-rate-gst-proposal/article69959558.ece 

    About Goods and Services Tax (GST):

    • Nature: Comprehensive, multi-stage, destination-based indirect tax on goods and services.
    • Introduction: Launched July 1, 2017, via the 101st Constitutional Amendment Act, 2016.
    • Replaced Taxes: Subsumed excise duty, value-added tax (VAT), service tax, etc.
    • Objectives: One Nation–One Tax, reduce cascading taxation, simplify compliance, expand tax base.
    • Structure: Five slabs – 0%, 5%, 12%, 18%, 28%, with cess on luxury/sin goods (tobacco, cars, online gaming).
    • Exemptions: Essential goods (food, medicines, education items) in 0% slab. Petroleum, alcohol, and electricity remain outside GST.

    Proposed Two-Rate GST Structure:

    • Reforms: Removal of 12% and 28% slabs; only 5% and 18% to remain.
    • Reclassification: 99% of 12% items → 5% slab; 90% of 28% items → 18% slab.
    • New Slab: 40% rate for demerit goods (tobacco, luxury cars, real-money gaming).
    • Cess: Compensation cess on 28% items to end.
    • Timeline: Implementation expected October 2025 (Diwali).

    Policy Rationale & Concerns:

    • Simplification: From four slabs to two, easing compliance and transparency.
    • Consumption Boost: Lower rates on daily goods to benefit households and Micro, Small and Medium Enterprises (MSMEs).
    • Compliance Gains: Less scope for disputes, litigation, and evasion.
    • Economic Signal: Projects confidence in domestic consumption as growth driver.
    • State Concerns: States, including Kerala, warn of revenue loss; call for compensation mechanism.
    [UPSC 2018] Consider the following items:

    1. Cereal grains hulled 2. Chicken eggs cooked 3. Fish processed and canned 4. Newspapers containing advertising material

    Which of the above items is/are exempted under GST (Goods and Services Tax)?

    Options: (a) 1 only (b) 2 and 3 only (c) 1, 2 and 4 only *(d) 1, 2, 3 and 4

     

  • [pib] Prototype Fast Breeder Reactor (PFBR)

    Why in the News?

    The Bharatiya Nabhikiya Vidyut Nigam Limited (BHAVINI) 500 MWe Prototype Fast Breeder Reactor (PFBR) at Kalpakkam, Tamil Nadu, is scheduled to achieve criticality in March 2026 and reach full power generation by December 2026.

    What is a Fast Breeder Reactor (FBR)?

    • A Fast Breeder Reactor (FBR) is a type of nuclear reactor that generates more fuel than it consumes, essentially “breeding” more nuclear material to power itself and future reactors.
    • It does this by using high-energy, or “fast,” neutrons to convert abundant, non-fissile uranium (U-238) into fissile plutonium (Pu-239) for fuel.

    About India’s Prototype Fast Breeder Reactor (PFBR):

    • Design began: 1980s as prototype for future 600 MWe FBRs.
    • Timeline: Construction began in 2004, faced delays; cost escalated from ₹3,500 crore to ₹7,700 crore.
    • Capacity: 500 MWe, sodium-cooled fast breeder reactor.
    • Predecessors: It builds on India’s earlier reactors: KAMINI and Fast Breeder Test Reactor (FBTR).
    • Technology: Completely indigenous, designed by Indira Gandhi Centre for Atomic Research (IGCAR).
    • Fuel: Uranium-Plutonium mixed oxide (MOX); later stages to use Thorium-232 to breed fissile U-233.
    • Burnup: 100 GWd/t, reactor life ~40 years.
    • Coolant: 1,750 tonnes of liquid sodium; pool-type design with high thermal inertia.
    • Construction agencies: Uranium-Plutonium mixed oxide (MOX) fuel fabricated by BARC Tarapur; reactor equipment by BHEL.
    • Site: Kokkilamedu, near Kalpakkam (next to Madras Atomic Power Station).

    Significance in India’s Nuclear Programme:

    • PFBR is the second stage of India’s three-stage programme:
      • Stage 1: Pressurised Heavy Water Reactors (PHWRs) using natural uranium.
      • Stage 2: Fast Breeder Reactors producing plutonium and U-233 from thorium.
      • Stage 3: Thorium-based U-233 fuel cycle.
    • Enables closed fuel cycle: recovery and recycling of fissile and fertile material from spent nuclear fuel (SNF).
    • Enhances energy security by optimally utilising limited uranium and vast thorium reserves.
    • Reduces radioactive waste through recycling.
    [UPSC 2024] With reference to radioisotope thermoelectric generators (RTGs), consider the following statements:

    1. RTGs are miniature fission reactors.

    2. RTGs are used for powering the onboard systems of spacecrafts.

    3. RTGs can use Plutonium-238, which is a by-product of weapons development.

    Which of the statements given above are correct?

    Options: (a) 1 and 2 only (b) 2 and 3 only* (c) 1 and 3 only (d) 1, 2 and 3

     

  • Haryana defines ‘Forest’: Controversy and Implications

    Why in the News?

    Haryana has notified the dictionary meaning of “forest” as per Supreme Court directions.

    Haryana defines ‘Forest’: Controversy and Implications

    Haryana’s definition of Forest:

    • Definition: A patch of land is deemed a forest if:
      • Minimum area: 5 hectares (isolated) or 2 hectares (contiguous with notified forest).
      • Minimum canopy density: 0.4 (40%) or more.
    • Exclusions: Linear/compact/agro-forestry plantations and orchards outside government-notified forests.
    • Aim: Create a uniform standard for identifying forests under the Forest (Conservation) Act, 1980 (FCA).

    Issues with Haryana’s Definition:

    • High thresholds:
      • 40% canopy cover excludes scrub forests and dry deciduous vegetation like the Aravallis.
      • 2–5 hectare size requirement too high for an arid state with fragmented green cover.
    • Exclusion of Aravallis: Sensitive ridge areas risk exposure to illegal mining, encroachment, and real estate development.
    • Contradiction with Godavarman judgment (1996): SC had ruled that “forest” must be understood in its dictionary meaning, regardless of size, ownership, or canopy density.
    • Dilution of protection under FCA 1980: Narrows the scope of land eligible for forest safeguards.

    Godavarman Case & FCA Background:

    • Forest (Conservation) Act, 1980: Restricted dereservation/diversion of forest land without Centre’s approval.
    • T N Godavarman v Union of India (1996): Court ruled “forest” must be understood in its dictionary meaning, covering all forested lands regardless of ownership or official status.
    • 2023 FCA Amendment: Limited scope to notified forests and recorded forest lands.
      • Amendment challenged by retired IFS officers and NGOs for diluting FCA protections.
    • SC in February 2024 directed States/UTs to continue using Godavarman definition while case is ongoing.

     

    [UPSC 2005] The minimum land area recommended for forest cover to maintain proper ecological balance in India is

    Options: (a) 0.25 (b) 0.33* (c) 0.43 (d) 0.53

     

  • Kalai-II Hydroelectric Project

    Why in the News?

    The Arunachal Pradesh State Pollution Control Board (APSPCB) conducted a public hearing for the proposed 1,200 MW Kalai-II hydroelectric project in Anjaw district.

    About Kalai-II Hydroelectric Project:

    • Location: Anjaw District, Arunachal Pradesh, on the Lohit River (tributary of the Brahmaputra).
    • Capacity: 1,200 MW (six turbines of 190 MW each + one unit of 60 MW).
    • Project Type: Run-of-river with pondage.
    • Key Features: Concrete gravity dam, diversion tunnels, underground powerhouse, surge chamber, and tailrace tunnel.
    • Power Generation: Estimated 4.85 TWh annually; free power worth ₹318 crore/year for the state.
    • Equity: Arunachal Pradesh holds 26% stake.

    Strategic Importance:

    • Energy Security: Expands India’s renewable energy portfolio and hydropower capacity in the North-East.
    • Geopolitical Context: Strengthens India’s presence in the sensitive Brahmaputra basin bordering China.
    • Economic Boost: Contributes to state revenues through free power and Local Area Development Fund (~₹2.2 crore/year).
    • Part of Larger Push: One of 13 stalled hydropower projects in Arunachal Pradesh revived through MoAs with central PSUs, aligning with India’s clean energy targets.
    [UPSC 2008] On which one of the following rivers is the Tehri Hydropower Complex located?

    Options: (a) Alaknanda (b) Bhagirathi *(c) Dhauliganga (d) Mandakini

     

  • NTCA limits definition of Tiger Corridors

    Why in the News?

    The National Tiger Conservation Authority (NTCA) recently issued a clarification limiting tiger corridors primarily to 32 “least cost pathways” identified in 2014.

    About National Tiger Conservation Authority (NTCA):

    • Statutory body: Under Ministry of Environment, Forest and Climate Change (MoEFCC).
    • Establishment: Created in 2006 under the Wildlife Protection Act, 1972.
    • Functions: Provides legal backing to Project Tiger, ensures Centre–State accountability via MoUs, and enables Parliamentary oversight.
    • Community Role: Addresses livelihood concerns of people around tiger reserves.
    • Composition: Chaired by MoEFCC Minister, Vice-Chairperson MoS, 3 Members of Parliament, MoEFCC Secretary, and others.

    What are Tiger Corridors?

    • Definition: Landscape linkages between tiger habitats that allow safe passage, genetic flow, and survival.
    • Need: Prevent isolation of tiger populations and human–tiger conflicts.
    • Examples of Macro-Corridors:
      • Shivalik–Gangetic Plains: Corbett–Dudhwa, Dudhwa–Kishanpur–Katerniaghat.
      • Central India & Eastern Ghats: Ranthambhore–Kuno–Madhav, Kanha–Pench, Bandhavgarh–Achanakmar.
      • Western Ghats: Sahyadri–Konkan–Radhanagari–Goa–Karnataka.
      • Northeast & Brahmaputra: Kaziranga–Karbi Anglong, Manas–Buxa.
      • Sundarbans Landscape.

    NTCA’s Policy Reversal:

    • July 25 Affidavit: Said corridor identification must use multiple data sources – protected areas, 2014 NTCA pathways, Tiger Conservation Plans (TCPs), Wildlife Institute of India (WII) studies (2016, 2021), and All-India Tiger Estimation (AITE) data.
    • August 21 Clarification: Limited definition only to 2014 least-cost pathways (32 corridors) and TCP corridors.
    • Exclusions: WII studies and AITE data dropped, despite 2014 report itself warning that listed corridors were “minimal requirement.”
    [UPSC 2020] Among the following Tiger Reserves, which one has the largest area under “Critical Tiger Habitat”?

    Options: (a) Corbett (b) Ranthambore (c) Nagarjunsagar-Srisailam* (d) Sunderbans