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Type: Prelims Only

  • Induction of INS Udaygiri

    Why in the News?

    India has advanced its indigenous naval capabilities with the induction of INS Udaygiri, the second stealth frigate built under Project 17A.

    ins udaygiri

    About INS Udaygiri:

    • Overview: It is the second stealth frigate delivered under Project 17A, marking a major milestone in India’s indigenous naval capabilities.
    • Legacy Name: Named after the decommissioned INS Udaygiri (F35), a Leander-class frigate that served from 1976 to 2007.
    • Construction: Delivered on July 1, 2025, by Mazagon Dock Shipbuilders Ltd (MDL) just 37 months after its launch, making it one of the fastest deliveries in the project.
    • Indigenous Technology: Contains homegrown sensors and combat systems, showcasing domestic defence manufacturing.
    • MSME Contribution: Over 200 Indian MSMEs participated in construction, aligning with the Aatmanirbhar Bharat mission.
    • Combat Features:
      • Blue-Water Capable: Designed for long-range operations, it can counter conventional and asymmetric threats, projecting Indian power in distant seas.
      • Stealth Features: Incorporates radar-absorbent materials and a low-infrared signature, making it hard to detect.
      • Arsenal: Equipped with supersonic surface-to-surface missiles, medium-range SAMs, a 76 mm main gun, and CIWS (30 mm and 12.7 mm).
      • Efficient Propulsion: Uses a combined diesel and gas (CODAG) propulsion system for both speed and efficiency.

    What is Project 17A?

    • Overview: It is the Indian Navy’s initiative to build seven stealth guided-missile frigates, launched in 2019 as a successor to Project 17 (Shivalik-class).
    • Shipbuilders Involved: Construction is shared between MDL (Mumbai) and GRSE (Kolkata) under Navy’s Warship Design Bureau (WDB).
    • Modern Design Features: Ships feature stealth hulls, reduced infrared signatures, and modular weapon systems.
    • Timeline and Launches: The first frigate, INS Nilgiri, was launched in 2019, with all ships targeted for delivery by 2026.
    • Technology Upgrades: Includes advanced radar, electronic warfare systems, and higher automation and survivability.
    • Indigenous Content: Project 17A emphasizes domestic components, supporting the Make in India defence policy.
    • Multi-Role Capabilities: Designed for anti-air, anti-surface, and anti-submarine warfare, suitable for high-threat scenarios.

     

    [UPSC 2016] Which one of the following is the best description of ‘INS Astradharini’, that was in the news recently?

    Options: (a) Amphibious warfare ship (b) Nuclear-powered submarine (c) Torpedo launch and recovery vessel* (d) Nuclear-powered aircraft carrier

     

  • [pib] Breakthrough in Altermagnets Study

    Why in the News?

    Researchers at S N Bose National Centre for Basic Sciences (SNBNCBS) have discovered a novel transport behaviour in chromium antimonide (CrSb), a member of the emerging class of magnetic materials called altermagnets.

    What are Altermagnets?

    • Definition: Altermagnets are a new class of magnetic materials that combine properties of ferromagnets (which show external magnetism) and antiferromagnets (which don’t).
    • Unique Feature: They don’t attract metals like fridge magnets but still have active internal magnetic behavior, useful in advanced technology.
    • Use in Spintronics: These materials are ideal for spintronics, a technology that uses electron spin (not just charge) to make faster and energy-efficient devices.
    • No Magnetic Interference: Altermagnets do not create external magnetic fields, so they are stable and safe for nearby electronics.
    • Energy Efficient: Their structure helps reduce heat and energy loss, which is perfect for modern low-power gadgets.
    • Scientific Rarity: Very few altermagnets are known, making each discovery important for materials science.
    • Potential Applications: They could help build smaller memory chips, faster processors, and even support quantum computing.
    • Internal Action: Think of them as “quiet magnets” — they work inside devices without magnetic noise.

    Recent Discovery- Chromium Antimonide (CrSb):

    • Indian Breakthrough: Indian scientists found CrSb, a new altermagnet, showing rare direction-dependent conduction.
    • Directional Behavior: CrSb acts as an n-type material when current flows along its layers, and as a p-type when current flows across them.
    • First of its Kind: This is the first time an altermagnet has shown such dual conduction behavior in different directions.
    • Device Simplification: Since CrSb can behave as both p-type and n-type, it can reduce circuit size and eliminate the need for doping.
    • Eco-friendly Material: CrSb is made from non-toxic, common elements, making it ideal for sustainable electronics.
    • Potential Applications:
      • Future Potential: CrSb could be used in solar cells, batteries, and processors to make them greener and more efficient.
      • Environment-Friendly Tech: CrSb enables low-cost and eco-friendly electronics without sacrificing performance.
    [UPSC 2021] Magnetite particles, suspected to cause neurodegenerative problems, are generated as environmental pollutants from which of the following? 1. Brakes of motor vehicles 2. Engines of motor vehicles 3. Microwave stoves within homes 4. Power plants 5. Telephone lines Select the correct answer using the code given below.

    Options: (a) 1, 2, 3 and 5 only (b) 1, 2 and 4 only* (c) 3, 4 and 5 only (d) 1, 2, 3, 4 and 5

     

  • What is India Energy Stack?

    Why in the News?

    The Union Ministry of Power announced the formation of a task force to design the India Energy Stack (IES) — a new Digital Public Infrastructure (DPI) for the energy sector.

    What is India Energy Stack?

    About India Energy Stack (IES):

    • Overview: IES is a Digital Public Infrastructure (DPI) initiative by the Ministry of Power.
    • Objective: It aims to create a unified, secure, and interoperable digital backbone for India’s entire energy ecosystem, including producers, grid operators, discoms, consumers, regulators, and markets.
    • Task Force: It is led by a 17-member task force with Nandan Nilekani as Chief Mentor, and RS Sharma as Chairperson, supported by REC Ltd as the nodal agency.
    • Implementation: A 12-month proof of concept (PoC) will pilot key components like the Utility Intelligence Platform (UIP) in states like Delhi, Gujarat, and Maharashtra.
    • Larger Impact: It is expected to support India’s transition to Net Zero, manage increasing renewable energy share, and enable consumer participation in energy trading.

    Key Features of India Energy Stack:

    • Scalability and Integration: It supports the integration of smart meters, real-time analytics, and battery storage systems, aligning with India’s energy digitisation goals.
    • Unique IDs: Provides digital identification for consumers, assets, and energy transactions, enabling seamless tracking and verification.
    • Real-Time Data Sharing: Consent-based, standardised data exchange mechanisms between stakeholders improve efficiency and transparency.
    • Open APIs: Allows integration of third-party solutions, encouraging innovation and energy fintech ecosystems.
    • Interoperability: Facilitates communication between currently fragmented digital platforms used by different state utilities and regulators.
    • Utility Intelligence Platform (UIP): A modular analytics layer to enable grid monitoring, load forecasting, demand-response, and consumer insights.
    • Peer-to-Peer Energy Trading: Empowers prosumers (producers + consumers) to buy, sell, or store energy using a digital marketplace.
    • Carbon Offset Tracking: Supports environmental compliance through transparent and verifiable emission reduction accounting.
    • Decentralised Energy Management: Enables small-scale producers and communities to participate in energy markets via smart contracts and virtual power plants.
    [UPSC 2016] Which one of the following is a purpose of ‘UDAY’, a scheme of the Government?

    (a) Providing technical and financial assistance to start-up entrepreneurs in the field of renewable sources of energy

    (b) Providing electricity to every household in the countries by 2018

    (c) Replacing the coal-based power plants with natural gas, nuclear, solar, wind and tidal power plants over a period of time

    (d) Providing for financial turnaround and revival of power distribution companies*

     

  • Electronic Private Automatic Branch Exchange (EPABX) in Modern Communication

    Why in the News?

    In most modern office environments, internal and external communication is managed through a technology known as EPABX — Electronic Private Automatic Branch Exchange.

    About EPABX:

    • What is it: It is a system used by offices to manage internal and external phone calls efficiently.
    • Internal and External Communication: It enables intercom communication within the organisation and provides access to external telephone lines through a unified network.
    • Call Handling Features: EPABX can route, transfer, forward, or hold calls, reducing the need for multiple phone lines and improving overall communication.
    • Modern Features: Advanced EPABX systems offer voicemail, call recording, automated attendants, and digital tool integration for business productivity.

    How EPABX Works?

    • Starting a Call: When the phone is picked up, an off-hook signal goes to the EPABX, which responds with a dial tone.
    • Making Internal Calls: Users dial an extension number (like 104), and the EPABX connects them through its internal switching system.
    • Making External Calls: To reach outside numbers, users dial an access code (usually 0) followed by the number; EPABX connects via the Public Switched Telephone Network (PSTN).
    • Handling Incoming Calls: Calls from outside are routed to the right extension using either a receptionist or an automated system (IVR) in newer setups.
    • Switching Logic: The EPABX system works like a railway yard, directing signals along the correct path between the caller and the recipient.

    Advancements in EPABX Technology:

    • Early Systems: Older EPABX systems used electromechanical switches like crossbars for call routing.
    • Digital Transition: Since the 1980s, systems adopted Pulse Code Modulation (PCM) and Time Division Multiplexing (TDM) to digitise and share voice signals over fewer lines.
    • VoIP Technology: Modern EPABX uses Voice over IP (VoIP) to transmit calls over the internet, similar to email routing using IP addresses.
    [UPSC 2019] With reference to communication technologies, what is/are the difference / differences between LTE (Long-Term Evolution) and VoLTE (Voice over Long-Term Evolution)?

    1. LTE ‘is commonly marketed as 3G and VoLTE is commonly marketed as advanced 3G.

    2. LTE is data-only technology and VoLTE is voice-only technology.

    Select the correct answer using the code given below.

    Options: (a) 1 only  (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2*

     

  • New flowering plant named after Nyishi Tribe

    Why in the News?

    A new species of flowering plant, Begonia nyishiorum, has been discovered in the East Kameng district of Arunachal Pradesh.

    New flowering plant named after Nyishi Tribe

    About Begonia nyishiorum:

    • Overview: Begonia nyishiorum is a recently identified flowering plant found in East Kameng, Arunachal Pradesh, and is endemic to this region.
    • Scientific Recognition: It was officially described in June 2025 in Novon, a peer-reviewed journal published by the Missouri Botanical Garden.
    • Feature: The species is notable for its crimson, fringed scales (indumentum) on light green petioles, a distinct trait among Asian begonias.
    • Habitat and Range: It thrives on moist, shaded mountain slopes between 1,500 and 3,000 metres in altitude.
    • Ecological Sensitivity: Known from only two forest locations, the plant is potentially vulnerable and warrants conservation attention.
    • Name Origin: The species name nyishiorum honours the Nyishi tribe, known for their traditional ecological stewardship of local forests.

    About the Nyishi Tribe:

    • Overview: The Nyishi are the largest ethnic group in Arunachal Pradesh, with a population of about 300,000.
    • Name Meaning: The word “Nyishi” combines “Nyi” (man) and “Shi” (being), signifying a civilised human in their language.
    • Linguistic Identity: Their language belongs to the Sino-Tibetan family, although its origins remain debated among scholars.
    • Geographic Spread: They live in eight districts of Arunachal Pradesh (like East Kameng, Papum Pare, and Kurung Kumey) and parts of Assam.
    • Livelihood Practices: Their economy includes slash-and-burn farming, hunting, fishing, and handicrafts such as bamboo work and weaving.
    • Key Festivals: They celebrate Boori-Boot (Feb) for unity, Nyokum (Feb) for prosperity, and Longte (Apr) for protection from evil.
    • Social Structure: Nyishi society is patrilineal and clan-based, with no caste system or rigid social hierarchy.
    • Role of Women: Women are seen as symbols of peace and prosperity, and marriages involve reciprocal family exchanges that build community ties.
    [UPSC 2016] Recently, our scientists have discovered a new and distinct species of banana plant which attains a height of about 11 metres and has orange-coloured fruit pulp.

    In which part of India has it been discovered?

    Options: (a) Andaman Islands* (b) Anaimalai Forests (c) Maikala Hills (d) Tropical rain forests of northeast

     

  • [pib] NAKSHA Programme 

    Why in the News?

    The Department of Land Resources (DoLR) under the Ministry of Rural Development is set to launch the second phase of capacity building for the NAKSHA programme (NAtional geospatial Knowledge-based land Survey of urban HAbitations).

    About NAKSHA Program:

    • Overview: It was launched on 18th February 2025. It is a geospatial land survey initiative launched by the Department of Land Resources (DoLR), Ministry of Rural Development, under the Digital India Land Records Modernisation Programme (DILRMP).
    • Objective: The programme aims to modernise urban land records, make property ownership more transparent, and streamline urban governance.
    • Funding: It is 100% centrally funded, with an estimated cost of ₹194 crore.
    • Significance: The programme was launched in response to India’s rapidly growing urban population, which is expected to exceed 600 million by 2031.

    Key Features:

    • Pilot Coverage: Implemented in 157 ULBs covering an area of 4,142.63 sq km, focusing on towns with an area of <35 sq km and a population of <2 lakh.
    • Drone-Based Survey: Uses drones equipped with LiDAR sensors and 5 cm resolution cameras to conduct aerial surveys.
    • Three-Stage Survey Process:
      • Drone Survey & Data Collection
      • Field Verification & Draft Mapping
      • Public Review & Finalisation
    • Integration with Legal Records: Field surveys validate and update property tax, ownership, and registration data.
    [UPSC 2024] With reference to the Digital India Land Records Modernisation Programme, consider the following statements:

    1. To implement the scheme, the Central Government provides 100% funding.

    2. Under the Scheme, Cadastral Maps are digitised.

    3. An initiative has been undertaken to transliterate the Records of Rights from local language to any of the languages recognized by the Constitution of India.

    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 3*

     

  • Prada-Kolhapuri Cultural Misappropriation Debate

    Why in the News?

    The Prada incident, involving footwear resembling India’s GI-tagged Kolhapuri chappals, has reignited debates on cultural respect, equitable benefit sharing, and the need for stronger global enforcement of GI rights.

    prada

    About the Kolhapuri Chappal Controversy:

    • Cultural Origin: They originated in Kolhapur and nearby districts in Maharashtra and Karnataka, dating back to the 12th–13th century, once worn by royals.
    • Craftsmanship and Features: These chappals are handmade from vegetable-tanned leather, use no nails or synthetic parts, and feature a T-strap design in natural tones.
    • GI Tag Recognition: They received a GI tag in 2019, covering eight districts across the two states.
    • Allegations Against Prada: Italian luxury brand Prada was accused of unauthorised cultural appropriation for selling similar sandals without acknowledging the traditional origin.
    • Global Enforcement Gap: The controversy highlights the limited international protection for GI-tagged goods and the need for stronger legal safeguards abroad.

    Earlier Cultural Misappropriation Cases:

    • Basmati Rice (1997): The US Patent and Trademark Office granted a patent to Ricetec Inc., claiming new “lines and grains” of basmati rice. After diplomatic and legal pressure, Ricetec was barred from using the term “Basmati.”
    • Turmeric (1995): A U.S. patent was granted for turmeric’s wound-healing properties, a use long documented in Ayurveda. CSIR successfully challenged and had the patent revoked.
    • Neem (2000): The European Patent Office revoked a patent granted to the USDA and W.R. Grace for neem-based antifungal formulations, citing that such usage existed in Indian traditional knowledge.

    Back2Basics: Geographical Indication (GI) Tags

    • Purpose: A GI tag is a form of intellectual property that certifies a product’s origin from a specific place where its quality or reputation is uniquely linked to that location.
    • Significance: GI tags help preserve cultural heritage, promote rural livelihoods, and enable market access for indigenous communities.
    • Legal Framework in India: In India, GI registration is governed by the Geographical Indications of Goods (Registration and Protection) Act, 1999, in force since 2003, and managed by the DPIIT, Ministry of Commerce.
    • Ownership and Validity: A GI tag is collectively owned by local producers, valid for 10 years, and renewable indefinitely, unlike private trademarks.
    • Examples of GI Goods: India has 658 GI goods, including Darjeeling tea, Madhubani paintings, Pashmina shawls, Chanderi sarees, and Kancheepuram silk.
    • Jurisdiction of Protection: GI protection is territorial, meaning legal misuse can only be challenged within the registered country, unless separately protected abroad.
    • Global Legal Backing: GI rights are supported by international treaties like the Paris Convention (1883) and the TRIPS Agreement (1995).

  • India’s first Genomic Atlas reveals deep Ancestry and Health Risks

    Why in the News?

    A landmark study published in the ‘Cell’ journal has sequenced the genomes of 2,762 Indians from 23 states and union territories, creating the most comprehensive genomic map of India to date.

    About the Genomic Atlas:

    • Overview: The Genomic Atlas is the most comprehensive genetic mapping of Indian populations, covering caste, tribe, language, geography, and urban-rural distinctions.
    • Collaboration: It was conducted by Indian and international institutions, aiming to understand how ancient migrations and social structures shaped Indian genomes.
    • Use of Molecular Clocks: Researchers used genetic mutations as molecular clocks to trace human ancestry and map the evolutionary history of diverse groups in India.
    • Focus on Disease and Ancestry: The study explores recessive disorders, disease-linked mutations, and interbreeding with archaic humans like Neanderthals and Denisovans.
    • Scope: Plans include expanding coverage to more isolated communities and building tools to track disease origins within genetically distinct Indian groups.
    • Impact on Precision Medicine: It aims to improve personalised healthcare by incorporating Indian genetic diversity into global medical research.

    Key Highlights of the Study:

    • Discovery of New Gene Variants: Over 2.6 crore previously undocumented genetic variants were discovered, many of which are absent from international gene databases.
    • Single-origin migration: Indians descend primarily from a single out-of-Africa migration ~50,000 years ago, not earlier human groups.
    • Three major ancestral components:
      • Ancient Ancestral South Indians (AASI) – early hunter-gatherers.
      • Iranian-related Neolithic farmers – from Sarazm (~4th millennium BCE).
      • Eurasian Steppe pastoralists – arrived around 2000 BCE, tied to Indo-European languages.
    • Additional East Asian ancestry: Found in East, Northeast, and some Central Indian populations (e.g., 5% in West Bengal), likely post-Gupta or rice cultivation-related (~520 CE).
    • Caste endogamy impacts: Long-term inbreeding within castes has led to high homozygosity, raising the risk of recessive genetic diseases.
    • Archaic DNA: Indian genomes show rich Neanderthal and Denisovan segments, especially in immune-related genes like MHC, TRIM, and BTNL2.
    • Unique health risks: A BCHE variant linked to anaesthetic reaction is enriched in Telangana; 7% of discovered protein-altering variants relate to serious genetic disorders.
    • Every individual had at least one genetic relative in the sample—revealing extreme interrelatedness and strong founder effects, particularly in South India.
    • Unmatched Neanderthal diversity: India harbours the widest variety of Neanderthal-derived genetic fragments among global populations.
    [UPSC 2021] In the context of hereditary diseases, consider the following statements:

    1. Passing on mitochondrial diseases from parent to child can be prevented by mitochondrial replacement therapy either before or after in vitro fertilization of the egg.

    2. A child inherits mitochondrial diseases entirely from the mother and not from the father.

    Options: Which of the statements given above is/are correct?

    (a) 1 only (b) 2 only (c) Both 1 and 2* (d) Neither 1 nor 2

     

  • Secondary Pollutants constitute up to third of PM2.5 Pollution

    Why in the News?

    A recent study by the Centre for Research on Energy and Clean Air (CREA) highlights that secondary pollutants, particularly ammonium sulphate, are responsible for nearly one-third of India’s PM2.5 pollution.

    What are Primary Air Pollutants?

    • Definition: Primary air pollutants are directly released into the atmosphere from specific sources like vehicles, coal plants, industries, and biomass burning.
    • Natural and Man-made Origins: They arise from both natural events, such as dust storms, and human activities like fuel combustion.
    • Key Examples:
      • Carbon monoxide (CO) – from incomplete fuel combustion in vehicles and stoves.
      • Sulphur dioxide (SO₂) – from burning sulphur-rich coal, especially in power plants.
      • Nitrogen oxides (NOₓ) – from high-temperature fuel combustion in vehicles and factories.
      • Particulate Matter (PM) – includes soot, dust, smoke, and other visible particles.
      • Volatile Organic Compounds (VOCs) – released from fuel fumes and industrial solvents.
    • Impact: These pollutants are immediately harmful to health and easier to trace to their sources.

    About Secondary Air Pollutants:

    • Definition: Secondary pollutants form in the atmosphere through chemical reactions involving primary pollutants and environmental agents like sunlight and water vapour.
    • Formation Factors: Their creation depends on weather, sunlight, and existing pollutants, making them more complex.
    • Key Examples:
      • Ammonium sulphate and nitrate – from SO₂ and NH₃ reacting in the air.
      • Ground-level ozone (O₃) – formed when NOₓ and VOCs react under sunlight.
      • Acid rain components – such as sulfuric and nitric acids.
      • Photochemical smog – a mix of toxic secondary pollutants in urban air.
    • Impact: They contribute heavily to PM2.5 pollution and have long-lasting, widespread effects.

    Highlights from CREA’s Study:

    • Ammonium Sulphate Share: This secondary pollutant accounts for 34% of India’s PM2.5, averaging 11.9 μg/m³ nationwide.
    • Source Link: It forms from SO₂ (mainly from coal plants) reacting with ammonia from fertilisers and waste.
    • FGD Compliance: Only 8% of India’s coal plants have installed flue gas desulphurisation (FGD) units, despite regulations.
    • High Exposure Zones: Within 10 km of coal plants, ammonium sulphate levels are 2.5 times higher than in distant areas.
    • NCAP City Impact: In 130 cities, it contributes 20–43% of PM2.5; in 114 cities, the share exceeds 30%.
    • Other Contributors: Ammonium nitrate and similar secondary compounds form up to 50% of PM2.5 in many places.
    • Policy Suggestions: The study urges rapid FGD rollout, fertiliser reform, and strict pollution control enforcement.
    [UPSC 2013] Photochemical smog is a resultant of the reaction among-

    Options: (a) NO 2 , O 3 and peroxyacetyl nitrate in the presence of sunlight * (b) CO 2 , O 2 , and peroxyacetyl nitrate in the presence of sunlight (c) CO, CO 2 , and NO 2 at low temperature (d) high concentration of NO 2 , O 3 and CO in the evening

     

  • Botrytis Fungus and Wine-Making

    Why in the News?

    Scientists have found that Botrytis cinerea, the fungus used in high-end sweet wines, cannot be cloned because none of its nuclei carry a full set of chromosomes, a rare genetic trait among fungi.

    About Botrytis Fungus:

    • Overview: Botrytis cinerea, also called noble rot, is a fungus that infects ripe grapes and causes them to shrivel while concentrating sugar and flavour.
    • Fungal Classification: It belongs to the ascomycetes group and produces spores in sac-like structures known as asci, each containing eight ascospores.
    • Role in Winemaking: Under controlled vineyard conditions, Botrytis infection is desirable, as it enhances the sweetness and aroma of wine.
    • How is Wine Made Using It?
      • Effect on Grapes: The fungus dehydrates the grapes, which increases the sugar content and concentrates flavours naturally.
      • Harvesting Method: Grapes affected by Botrytis are hand-harvested, making the process labour-intensive and expensive.
      • Wine Varieties Produced: It is used to produce premium dessert wines such as Sauternes (France), Tokaji Aszú (Hungary), and Trockenbeerenauslese (Germany), known for their complex flavours and high value.

    Significance of Recent Findings:

    • Cloning Discovery: A recent study in Science found that Botrytis cannot be cloned, as no single nucleus contains a full set of chromosomes.
    • Unique Genome Structure: The chromosomes are distributed across multiple nuclei, which is unprecedented in any known fungus, animal, or plant.
    • Scientific Impact: This challenges conventional genetics and may lead to new insights in genome organisation and fungal evolution.
    • Dual Importance: Botrytis is now seen not only as a key player in winemaking but also as a genetic curiosity in modern science.
    [UPSC 2009] In the context of alternative sources of energy, ethanol as a viable bio-fuel can be obtained from:

    (a) Potato (b) Rice (c) Sugarcane* (d) Wheat