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GS Paper: GS3

  • [pib] Indian Scientists created high-performance Supercapacitor Material

    Why in the News?

    Scientists from Bengaluru, in collaboration with Aligarh Muslim University, have developed an advanced material that significantly improves supercapacitor performance.

    What are Supercapacitors?

    • Fast-Charging Energy Devices: Supercapacitors are special tools that store and release energy very quickly, much faster than regular batteries.
    • Used in Modern Technology: They are found in phones, electric vehicles, and solar systems where fast energy delivery is needed.
    • Trade-Off in Storage: While they charge faster, they generally hold less energy than traditional batteries.
    • Ongoing Scientific Efforts: Researchers are trying to increase energy capacity without sacrificing their quick-charging abilities.

    About Lanthanum-Doped Silver Niobate:

    • New Material from Indian Scientists: A research team from Bengaluru and Aligarh Muslim University created a better material for supercapacitors.
    • Silver Niobate as Base: They used silver niobate, which is non-toxic and eco-friendly, as the base material.
    • Improved by Lanthanum Doping: They added lanthanum, a rare metal, to help enhance electrical performance — a method called doping.
    • Smaller Particles, Bigger Surface: The particles became smaller, increasing the surface area for energy storage.

    What makes this material special?

    • Better with Use: The material retained 118% of its capacity after repeated use, showing it improved over time.
    • 100% Energy Efficiency: It wasted no energy during charge or discharge, making it highly efficient.
    • Quick and Smooth Performance: It delivered energy faster and more steadily than previous materials.
    • Proven in Real-World Test: A test device using this material could power an LCD screen, proving practical use.
    • Eco-Friendly Choice: It is lead-free and safe for the environment.
    • Future Potential: Scientists hope to apply this method to other materials and scale up for commercial use in electronics, EVs, and solar tech.
    [UPSC 2022] With reference to India, consider the following statements:

    1. Monazite is a source of rare

    earths. 2. Monazite contains thorium. 3. Monazite occurs naturally in the entire Indian coastal sands in India. 4. In India, Government bodies only can process or export monazite.

    Which of the statements given above are correct ?

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

     

  • Groundwater crisis deepens in Karnataka’s hard rock terrain 

    Why in the News?

    In a recent study, researchers from WELL Labs in Chennai studied Aralumallige and Doddathumakuru gram panchayats in the Upper Arkavathy watershed near Bengaluru, and found a sharp drop in groundwater levels caused by intensive farming practices.

    What drives groundwater depletion in the Deccan Plateau?

    • Hard Rock Aquifers with Low Storage Capacity: The Deccan Plateau is underlain by basalt and granite (hard rock aquifers) that have limited porosity. These rely on fractures and weathered zones to store water, making them less efficient in holding groundwater. Eg: In Karnataka, 99% of the area depends on such aquifers, making sustainable storage difficult.
    • Deep Borewell Drilling Alters Natural Recharge: Borewells drilled into granite cause microfractures, allowing rainwater to bypass shallow aquifers and flow deep underground. This disrupts the natural recharge cycle and reduces groundwater retention.  
    • Water-Intensive Agriculture: Cultivation of vegetables, flowers, and exotic crops for urban markets like Bengaluru demands large volumes of groundwater. These crops are not suited to the dry, hard-rock geology of the region.  
    • Encroachment of Traditional Recharge Systems: Lakes and tanks, once used for groundwater recharge, are being encroached upon or neglected. Their discharge channels are blocked, eliminating natural recharge opportunities. Eg: The lake in Aralumallige (Karnataka), once a major recharge source, remained dry in 2022 despite heavy rainfall.

    Why is reliance on borewells unsustainable in rural Karnataka?

    • Rapid Groundwater Depletion and Borewell Failures: Continuous extraction through deep borewells causes the water table to drop, making it harder to access groundwater over time. Eg: In the Upper Arkavathy watershed, the average borewell depth increased from 183m to 321m in just two decades. Over 70% of drinking water wells failed within 10 years of construction.
    • High Financial Burden on Farmers and Panchayats: Drilling deeper borewells costs ₹4–5 lakh, often unaffordable for small farmers, with no guarantee of success. Free electricity for pumping increases electricity consumption and debt for gram panchayats. Eg: Panchayats face mounting electricity bills, diverting funds away from development works to cover power costs.
    • Disruption of Natural Recharge and Local Hydrology: Borewells alter subsurface geology, causing rainwater to bypass shallow aquifers, reducing natural recharge. Eg: In Aralumallige and Doddathumakuru, borewell drilling weakened long-term water retention, contributing to chronic scarcity despite seasonal rains.

    What is the socio-economic impact on local communities and governance?

    • Rising electricity debt: Free power for farmers fuels overuse, pushing gram panchayats into unsustainable debts as they divert development funds to pay power bills.
    • Borewell burden on small farmers: Drilling costs ₹4-5 lakh with no assurance of success, leading many farmers to lease land and migrate to cities.

    What are the issues related to groundwater in Indian?

    • Overexploitation and Depletion: Unregulated extraction of groundwater for agriculture and urban use has led to rapid depletion of water tables. Eg: In parts of Punjab, Haryana, and Karnataka (like Aralumallige), water tables have fallen by over 100 meters in two decades due to borewell dependence.
    • Poor Groundwater Quality: Contamination by nitrates, fluoride, and arsenic poses serious health risks, especially in rural areas. Eg: In Bihar and West Bengal, arsenic contamination affects drinking water; in Karnataka, nitrate levels often exceed safe limits (50 mg/l).
    • Inadequate Data and Poor Management: Lack of real-time monitoring, insufficient local-level data, and fragmented water governance hinder sustainable planning. Eg: Despite groundwater overuse, local panchayats often lack predictive tools to estimate borewell failure or manage recharge zones effectively.

    What are the steps taken by the Indian Government?

    • Jal Shakti Abhiyan (JSA): A nationwide water conservation campaign launched in 2019 to promote rainwater harvesting, recharge structures, and sustainable water use. Eg: In water-stressed blocks of states like Maharashtra and Rajasthan, the JSA promoted check dams and contour trenches to boost groundwater recharge.
    • Atal Bhujal Yojana (Atal Jal): A World Bank-assisted scheme launched in 2019 for sustainable groundwater management in 7 states. It focuses on community participation, water budgeting, and crop water use efficiency. Eg: In Gujarat and Madhya Pradesh, water user associations have helped monitor and reduce groundwater extraction.
    • Groundwater Regulation by Central Groundwater Authority (CGWA): The CGWA regulates groundwater usage in over-exploited areas by mandating No Objection Certificates (NOCs) for industries and commercial users.

    Way forward: 

    • Promote Sustainable Farming Practices: Shift from water-intensive crops (like paddy, sugarcane) to less water-demanding crops suited to agro-climatic conditions.
    • Strengthen Local Water Governance: Empower Gram Panchayats to manage groundwater through community water budgeting, real-time monitoring, and local recharge efforts.

    Mains PYQ:

    [UPSC 2019] Enumerate the indirect taxes which have been subsumed in the goods and services tax (GST) in India. Also, comment on the revenue implications of the GST introduced in India since July 2017.

    Linkage: The article talks about the GST replaced many older taxes like VAT and excise duty, helping create a single national market. Although GST collections have steadily grown—reaching ₹22.08 lakh crore in 2024–25—the revenue from tobacco (about ₹551 billion a year) is much less than the huge cost of tobacco-related health problems, which is ₹2,340 billion every year.

  • 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*

     

  • GST reform and unfinished business in tobacco control

    Why in the News?

    As India completes eight years of implementing the Goods and Services Tax (GST), the focus has moved from its economic benefits to its problems, especially in public health, like the poor taxation of tobacco.

    What are GST’s major achievements and gaps after eight years?

    Achievements: 

    • Unified Tax System: Replaced multiple indirect taxes with one national tax, promoting the “One Nation, One Tax” concept.
    • Increased Revenue Collection: GST collections reached ₹22.08 lakh crore in 2024–25, showing consistent growth.
    • Improved Ease of Doing Business: Simplified compliance through harmonised tax rates and digital processes.
    • Boosted Logistics Efficiency: Removal of inter-State checkpoints reduced transport time and costs.
    • Reduced Tax Cascading: The Input Tax Credit mechanism lowered production costs for businesses and prices for consumers.

    Gaps:

    • Ineffective Public Health Taxation: Tobacco taxation remains weak under GST, despite high health and economic burdens.
    • Decline in Specific Excise Duties: Over-reliance on ad valorem GST weakened price control on harmful products like bidis and cigarettes.
    • Inadequate Tax on Bidis: Bidis, widely consumed by low-income groups, are under-taxed and not covered under the GST compensation cess.
    • Loss of Revenue Post-Cess Expiry: The GST compensation cess (a major source of tobacco tax) will expire in 2026, risking affordability and public health.
    • Weak Deterrent Against Tobacco Use: Unlike pre-GST years, tax stagnation has failed to reduce tobacco consumption, ignoring WHO’s 75% tax recommendation.

    Why is GST ineffective in curbing tobacco use?

    • Lack of Significant Tax Hikes Post-GST: Since the introduction of GST in 2017, there have been no major tax increases on tobacco products. In contrast, during the pre-GST era (2009–17), regular hikes in excise and VAT contributed to a 17% decline in tobacco use.
    • Low Overall Tax Burden: The total tax on tobacco remains below the WHO-recommended 75% of retail price — only 22% for bidis, 54% for cigarettes, and 65% for smokeless tobacco. This allows tobacco products to remain affordable, especially for youth and low-income groups.
    • Under-Taxation of Harmful Products like Bidis: Bidis, the most consumed smoked tobacco product, are exempt from the GST compensation cess. Despite causing harm similar to cigarettes, they generate very low tax revenue and are widely used by low-income populations, reducing the deterrent effect of taxation.
    • Reduced Price Deterrence:  After GST, the share of excise duty fell sharply (e.g., from 54% to 8% for cigarettes), weakening the price-based disincentive for tobacco use.
    • Industry Manipulation of Ad Valorem Taxes: GST relies heavily on ad valorem taxes (based on product price), which are easier for the tobacco industry to manipulate through pricing strategies. Without specific excise duties, companies can keep prices low, making harmful products like bidis and cheap cigarettes affordable to the masses.

    What reforms can align tobacco taxes with health goals? (Way forward)

    • Introduce or Increase Specific Excise Duties: Add a fixed per-unit tax (specific excise) on tobacco products along with GST. Eg: Countries like the Philippines combine ad valorem and specific taxes, leading to higher prices and lower consumption.
    • Raise GST and Cess to Statutory Limits: Increase GST on tobacco to the legal ceiling of 40% and expand the GST Compensation Cess to include under-taxed products like bidis. Eg: Bidis, used by the poor and causing major health harm, are not covered under the cess, reducing their tax burdenand health deterrence.
    • Link Tax Policy with Inflation and Income Growth: Regularly update tobacco taxes to offset rising incomes and inflation, preventing increased affordability over time. Eg: WHO recommends adjusting taxes annually so that tobacco doesn’t become more affordable even if incomes rise.

    Mains PYQ:

    [UPSC 2019] Enumerate the indirect taxes which have been subsumed in the goods and services tax (GST) in India. Also, comment on the revenue implications of the GST introduced in India since July 2017.

    Linkage: The article talks about the GST replaced many older taxes like VAT and excise duty, helping create a single national market. Although GST collections have steadily grown—reaching ₹22.08 lakh crore in 2024–25—the revenue from tobacco (about ₹551 billion a year) is much less than the huge cost of tobacco-related health problems, which is ₹2,340 billion every year.

  • ZSI records 683 faunal discoveries in its 110th year

    Why in the News?

    The Zoological Survey of India (ZSI) released Version 2.0 of the Checklist of Fauna of India, documenting 105,244 species and subspecies.

    Back2Basics: Zoological Survey of India

    • The ZSI was set up by British zoologist Thomas Nelson Annandale in 1916.
    • It is the premier taxonomic research organisation in India, based in Kolkata.
    • It was established to promote surveys, exploration and research leading to the advancement of our knowledge of various aspects of the exceptionally rich animal life of India.
    • The ZSI had its genesis as the Zoological Section of the Indian Museum at Calcutta in 1875.
    • Since its inception, the ZSI has been documenting the diversity and distribution of the fauna of India towards carrying out its mandate of conducting exploration-cum-taxonomic-research programmes.
    • The ZSI has published an extremely large amount of information on all animal taxa, from Protozoa to Mammalia.

    Key Findings About ZSI’s Work and Discoveries (2024–25):

    • Significant Animal Discoveries:
      • New Genus: Dravidoseps gouensis – a new genus of skink (lizard) from Western Ghats
      • New Species of Snakes: Anguiculus dicaprioi – named after actor Leonardo DiCaprio, belongs to the Colubridae family
      • Other Reptiles: 2 new genera and 37 new species of reptiles discovered
      • Amphibians: 5 new amphibian species, including frogs from northeastern and southern India
      • Other Invertebrates: Multiple new insect species, particularly among beetles, moths, flies, and bees
    • Highest representation among newly discovered species were insects, especially:
      • Coleoptera (beetles)
      • Lepidoptera (moths and butterflies)
      • Diptera (flies)
      • Hymenoptera (ants, bees, wasps)
    [2020] With reference to India’s Biodiversity, Ceylon frogmouth, Coppersmith barbet, Gray-chinned minivet and White-throated redstart are:

    (a) Birds

    (b) Primates

    (c) Reptiles

    (d) Amphibians

     

  • 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

     

  • 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