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Type: Prelims Only

  • Modern Indian History-Events and Personalities

    Who was Ishwar Chandra Vidyasagar (1820–1891)?

    Prelims Only | History | Mains Paper 1: Modern Indian History

    Why in the News?

    On his birth anniversary (26 September), the Union Home Minister paid tribute to the Bengali social reformer, Ishwar Chandra Vidyasagar.

    Ishwar Chandra Vidyasagar

    About Ishwar Chandra Vidyasagar:

    • Birth & Death: Born on 26 September 1820 in Birsingha, Paschim Medinipur, West Bengal; died on 29 July 1891 in Kolkata.
    • Early Life: Born into a poor priest family to Thakurdas Bandyopadhyay and Bhagavati Devi.
    • Title “Vidyasagar”: Meaning “Ocean of Knowledge,” conferred by Sanskrit College for his mastery of Sanskrit and philosophy.
    • Education: Excelled in Sanskrit grammar, Vedanta, literature, astronomy, logic; graduated with honours in 1841 from Sanskrit College, Calcutta.
    • Career: Served as Head Pandit at Fort William College, later Principal of Sanskrit College, Kolkata, and also Inspector of Schools.

    His Contributions:

    • Educational Reforms:

      • Simplified and modernised the Bengali alphabet and prose.
      • Authored “Borno Porichoy”, a primer still used to teach Bengali script.
      • Opened teacher training institutions and promoted non-Brahmin access to Sanskrit College.
      • Advocated blending traditional Indian learning with Western education.

    • Women’s Rights and Social Reform:

      • Leading advocate of Hindu widow remarriage; efforts led to the Hindu Widows’ Remarriage Act, 1856.
      • Strongly opposed child marriage and polygamy.
      • Championed raising the age of consent, influencing the Age of Consent Act, 1891.
      • Promoted women’s education, serving as secretary of the Hindu Female School (later Bethune School).

    • Philanthropy and Grassroots Work:

      • Founded schools for girls and adults in Santhal Parganas (Jharkhand).
      • Set up a free homeopathy clinic for tribals and the poor.

    • Language and Literature:

      • Regarded as the Father of Modern Bengali Prose.
      • Made Bengali prose clear, concise, and accessible to common people.
    [UPSC 2021] Who among the following was associated as Secretary with Hindu Female School which later came to be known as Bethune Female School?

    Options: (a) Annie Besant (b) Debendranath Tagore  (c) Ishwar Chandra Vidyasagar* (d) Sarojini Naidu

     

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  • Climate Change Impact on India and World – International Reports, Key Observations, etc.

    What are ‘Planetary Boundaries’?

    Prelims Only | Enviro & Biodiversity | Mains Paper 3: Conservation, Environmental Pollution & Degradation, Eia

    Why in the News?

    The Planetary Health Check (PHC) 2025 has warned that 7 of 9 planetary boundaries have now been breached.

    About Planetary Health Check (PHC):

    • The PHC is a global scientific assessment of Earth system health, tracking ecological thresholds that keep the planet habitable.
    • The 2025 report warns that 7 of 9 planetary boundaries have now been breached, with ocean acidification crossing the safe zone for the first time.
    • It highlights how human activities — fossil fuel combustion, deforestation, unsustainable agriculture, and industrial waste — are driving Earth beyond its safe operating space for the first time in 11,000 years.

    What are ‘Planetary Boundaries’?

    What are Planetary Boundaries?

    • Proposition: Coined in 2009 by scientists led by Johan Rockstrom.
    • What are they: Defines safe operating space for humanity by setting ecological thresholds that regulate Earth system stability and resilience.
    • Basis: Based on Holocene conditions (last ~11,000 years) that enabled human civilisation to thrive.
    • Significance: Crossing boundaries risks irreversible environmental collapse.

    • Nine Planetary Boundaries (PBs):

      1. Climate Change (CO₂ Concentration & Radiative Forcing): Safe atmospheric Carbon Dioxide (CO₂) level: 350 parts per million (ppm). Current: 423 ppm (2025); radiative forcing at +2.97 Watts per square meter (W/m²) (safe: +1.5 W/m²).
      2. Biosphere Integrity (Biodiversity Loss / Extinction Rate): Extinction rate at 100 extinctions per million species years (E/MSY) vs safe 10 E/MSY; severe biodiversity decline continues.
      3. Land System Change (Deforestation / Ecosystem Conversion): Global forest cover reduced to 59% (safe: 75%). All major terrestrial biomes breached.
      4. Freshwater Change (Streamflow & Soil Moisture Deviations): Over 20% of global land shows significant streamflow (22.6%) and soil moisture (22%) deviations beyond thresholds. Indo-Gangetic Plain & North China basins most at risk.
      5. Biogeochemical Flows (Nitrogen & Phosphorus Cycles): Excessive use of Nitrogen (N) and Phosphorus (P) in agriculture, worsening dead zones and eutrophication in water bodies.
      6. Novel Entities (Synthetic Pollutants & Plastics): Release of plastics, synthetic chemicals, and untested compounds exceeds the safe zero-threshold for environmental introduction.
      7. Ocean Acidification (Aragonite Saturation State): Surface ocean acidity has increased by 30–40% since the industrial era. Aragonite saturation state (Aragonite) at 2.84 (safe: 2.86). Threatens corals, molluscs, and plankton.
      8. Atmospheric Aerosol Loading (Aerosol Optical Depth – AOD) [Currently Safe]: Interhemispheric Aerosol Optical Depth (AOD) difference: 0.063, below safe threshold 0.10. Still harmful for health despite planetary stability.
      9. Stratospheric Ozone Depletion (Ozone Concentration in Dobson Units – DU) [Currently Safe]: Global ozone concentration stable at 285–286 Dobson Units (DU) (safe: 277 DU). Ozone hole recovery continues, though new threats flagged from rocket launches and satellite debris.
    [UPSC 2018] The term “sixth mass extinction/sixth extinction” is often mentioned in the news in the context of the discussion of:

    (a) Widespread monoculture practices in agriculture and large-scale commercial farming with indiscriminate use of chemicals.

    (b) Fears of a possible collision of a meteorite with the Earth.

    (c) Large scale cultivation of genetically modified crops.

    (d) Mankind’s over-exploitation/misuse of natural resources, fragmentation/loss of natural habitats, destruction of ecosystems, pollution and global climate change.

     

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  • Soil Health Management – NMSA, Soil Health Card, etc.

    Desert Soilification Technology

    Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

    Why in the News?

    For the first time, researchers at the Central University of Rajasthan (CUoR) have successfully grown wheat in arid land of western Rajasthan using desert soilification technology.

    What is Desert Soilification Technology?

    • Overview: It is an innovative biotechnological method that transforms barren desert sand into soil-like material capable of supporting agriculture.
    • Technology: It uses bioformulations and polymers to bind loose sand particles, improve soil texture, and enable water retention.
    • Utility: It is designed to combat desertification, enhance agricultural productivity in arid zones, and ensure sustainable land use.
    • How does it work?
      • Polymer-based Bioformulation: Natural polymers and microbial formulations are applied to desert sand.
      • Cross-Linking of Sand Particles: Bio-polymers create a structural network, binding sand grains together into a soil-like matrix.
      • Water Retention: The cross-linked structure traps water, drastically reducing irrigation needs and preventing rapid percolation of water through sandy soil.
      • Microbial Boost: Introduced beneficial microbes stimulate plant growth, improve soil fertility, and enhance stress resistance of crops.
      • Soil-like Properties: The modified sand mimics fertile soil — enabling nutrient retention, microbial colonization, and sustainable cropping.

    Key Features:

    • Sand-to-Soil Conversion: Cross-links sand particles into a soil-like structure, creating porosity and root-holding capacity.
    • Water Retention Efficiency: Increases moisture-holding ability of sand, thereby reducing irrigation requirements by 30–40%.
    • Microbial Boost: Bioformulation stimulates beneficial soil microbes, enhancing nutrient cycling and crop stress resistance.
    • Crop Versatility: Tested successfully with wheat, bajra, guar gum, chickpea, and is now being expanded to millets and green gram.
    • Low Input Agriculture: Reduces number of irrigation cycles (3–4 vs 5–6 in normal wheat farming).
    • Climate Resilience: Provides a sustainable model for food production in water-stressed and desertified regions.
    • Scalability: Can be replicated in other arid ecosystems beyond Rajasthan (potential use in Middle East, Africa).
    [UPSC 2023] Which one of the following best describes the concept of ‘Small Farmer Large Field’?

    (a) Resettling war-displaced people on shared cultivable land

    (b) Marginal farmers group to coordinate farm operations *

    (c) Marginal farmers lease land collectively to a corporate

    (d) A company funds and guides farmers to grow required crops

     

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  • Bharat Emission Standards

    Corporate Average Fuel Efficiency (CAFE) Norms

    Prelims Only | Enviro & Biodiversity | Mains Paper 3: Conservation, Environmental Pollution & Degradation, Eia

    Why in the News?

    The Bureau of Energy Efficiency (BEE) under the Ministry of Power has issued draft CAFE-3 and CAFE-4 norms, applicable from April 2027 to March 2037.

    About Corporate Average Fuel Efficiency (CAFE) Norms:

    • What is it: Standards that mandate automakers to maintain a sales-weighted fleet average of fuel efficiency and CO₂ emissions across all passenger vehicles.
    • Origin:
      • First introduced in the United States in 1975 after the Arab Oil Embargo, aimed at lowering oil dependency.
      • In India, first notified in 2017 under the Energy Conservation Act, 2001, framed by the Bureau of Energy Efficiency (BEE), Ministry of Power.
    • Objective:
      • Reduce CO₂ emissions and oil imports, improve energy security.
      • Push adoption of EVs, hybrids, flex-fuels, and fuel-efficient technologies.
    • Applicability: Passenger vehicles (< 3,500 kg gross vehicle weight) across petrol, diesel, LPG, CNG, hybrid, and electric categories.
    • Phased Implementation in India:
      • CAFE I (2017–2022) → CO₂ emission limit of 130 g/km.
      • CAFE II (2022–2027) → stricter limit of 113 g/km.
      • CAFE III (Draft, 2027–2032) → 91.7 g/km CO₂ limit, aligned with WLTP (World Harmonised Light Vehicle Test Procedure).
      • CAFE IV (Draft, 2032–2037) → 70 g/km CO₂ limit (most stringent stage yet).
    • Recent Updates (Draft CAFE-3 & CAFE-4, Sept 2025):
      • Automakers allowed to form pools of up to 3 manufacturers.
      • Pooling treated as one fleet for compliance; pool manager bears penalty if limits breached.
      • A manufacturer can join only one pool per year but can switch in later years.
      • Special relief for small cars (under 4m, <909 kg, <1200 cc): eligible for up to 9 g/km CO₂ relief.
      • Incentives for flex-fuel vehicles (ethanol-petrol blends) and strong hybrids alongside EVs.
      • Aim: Balance decarbonisation with consumer affordability and revive the small car segment (which saw 71% sales decline in 6 years).
    • Compliance & Penalties:
      • Exceeding CO₂ limits: Regulatory fines under the Energy Conservation Act, 2001.
      • CAFE credits may be earned, traded, or carried forward to offset temporary lapses.
    • Green Impact:
      • Complements India’s Net Zero 2070 goals.
      • Encourages fuel-efficient models, biofuels, and EV adoption.

    How are CAFE Norms different from Bharat Stage (BS) Norms?

    CAFE Norms Bharat Stage (BS) Norms
    Full Form Corporate Average Fuel Efficiency Bharat Stage Emission Standards
    Primary Focus Fleet-wide fuel efficiency & CO₂ emissions Individual vehicle toxic exhaust pollutants (NOx, PM, CO, HC, SOx)
    Objective Reduce oil imports, improve energy efficiency, cut CO₂ Reduce air pollution & public health risks
    Regulating Authority BEE, Ministry of Power (Energy Conservation Act, 2001) MoEFCC & CPCB
    Scope Passenger vehicles (<3,500 kg GVW; petrol, diesel, LPG, CNG, hybrids, EVs) Mainly ICE vehicles; tailpipe pollutants from petrol & diesel
    Parameters Measured Fleet average CO₂ (g/km) Pollutants: NOx, CO, PM, HC, SOx
    Basis of Measurement Sales-weighted fleet average across all models Individual vehicle emissions tested
    Phases in India CAFE I (2017–22: 130 g/km) → CAFE II (2022–27: 113 g/km) → Draft CAFE III (2027–32: 91.7 g/km) → Draft CAFE IV (2032–37: 70 g/km) BS-I (2000) → BS-II (2005) → BS-III (2010) → BS-IV (2017) → BS-VI (2020; leapfrogged BS-V)
    Testing Standard Fuel efficiency & CO₂ per km (lab-tested, WLTP cycle for future) Pollutant emissions measured under regulated driving cycles
    Impact on Industry Forces OEMs to balance fleet mix (e.g., SUVs offset by EVs/hybrids) Forces OEMs to adopt clean fuel & emission-control tech (e.g., DPF, SCR)
    Penalties Heavy fines for fleet CO₂ non-compliance; penalties apply to pool manager in pooled fleets Non-compliant vehicles cannot be sold; penalties & recalls
    Global Parallel U.S. CAFE norms (1975) Euro emission standards

     

    [UPSC 2020] Which of the following are the reasons/factors for exposure to benzene pollution?

    1. Automobile exhaust 2. Tobacco smoke 3. Wood burning 4. Using varnished wooden furniture 5. Using products made of polyurethane

    Select the correct answer using the code given below:

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

     

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  • [pib] Central Consumer Protection Authority (CCPA)

    Prelims Only | Governance | Mains Paper 2: Governance, Transparency & Accountability, Citizens Charters

    Why in the News?

    The Central Consumer Protection Authority (CCPA) has imposed a penalty of ₹2,00,000 FirstCry for false and misleading price representations on its e-commerce platform.

    Background of the Case: You Must Know

    • Complaint: Products were displayed with the claim “MRP inclusive of all taxes,” but additional GST was levied at checkout.
    • Effect: Misled consumers by showing higher discounts than actually offered.
    • Findings:
      • A product advertised at 27% discount was effectively sold at 18.2% discount after GST.
      • Such pricing amounted to misleading advertisements (Section 2(28)) and unfair trade practices (Section 2(47)).
    • Dark Pattern: The practice qualified as “drip pricing”, a dark pattern under the Guidelines for Prevention and Regulation of Dark Patterns, 2023.
    • Violation of E-Commerce Rules: Contravened Rule 7(1)(e) of Consumer Protection (E-Commerce) Rules, 2020, which mandates displaying the total price inclusive of all charges and taxes upfront.

    About Central Consumer Protection Authority (CCPA):

    • Established: Under Section 10 of Consumer Protection Act, 2019 (effective July 20, 2020).
    • Nodal Ministry: Ministry of Consumer Affairs, Food & Public Distribution.
    • Functions & Powers:
      • Protects and enforces consumer rights as a class.
      • Prevents unfair trade practices and misleading advertisements.
      • Can initiate class-action suits (recalls, refunds, license cancellation).
      • Investigates through Investigation Wing headed by a Director-General.
      • Can order discontinuation of unfair practices and impose penalties.
    • Composition of CCPA: Chief Commissioner (Head); 2 Commissioners-
      • One for goods-related issues.
      • One for services-related complaints.
    [UPSC 2023] Consider the following organizations/bodies in India:

    1. The National Commission for Backward Classes

    2. The National Human Rights Commission

    3. The National Law Commission

    4. The National Consumer Disputes Redressal Commission

    How many of the above are constitutional bodies?

    (a) Only one * (b) Only two (c) Only three (d) All four

     

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  • Iran’s Nuclear Program & Western Sanctions

    What is Uranium Enrichment?

    Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

    Why in the News?

    Iran’s supreme leader recently said Tehran has limited uranium enrichment to 60% U-235 and will not pursue further enrichment to ~90% (weapons grade).

    About Uranium Enrichment:

    • What is it: The process of increasing the proportion of U-235 isotope in uranium samples. Natural uranium has only 0.7% U-235, while the rest is mostly U-238.
    • Types of Enrichment:
      • Low-Enriched Uranium (3–5%): Used in civilian nuclear power reactors.
      • Highly Enriched Uranium (HEU, >20%): At 90%+ enrichment, uranium becomes weapons-grade, usable for efficient nuclear weapons.
    • Methods: Physical separation methods such as gas centrifuges, requiring advanced infrastructure and technology.
    • Implications:
      • Low enrichment: Controlled power generation.
      • High enrichment: Proliferation risks, shorter path to nuclear weapons capability.

    What is Uranium Enrichment?

    Controversy about Iran’s Pursuit:

    • Declared Program: Iran enriches uranium to 60% U-235, claiming peaceful purposes, but insists it will not pursue 90%+ enrichment.
    • Global Concerns:
      • Civilian irrelevance: 60% has no reactor use, only shortens the “breakout time” to weapons-grade.
      • IAEA Monitoring: International Atomic Energy Agency reports show significant 60% stockpiles, heightening suspicion.
    • Geopolitical Context:
      • Joint Comprehensive Plan of Action (2015) capped enrichment at 3.67% but collapsed after U.S. withdrawal in 2018.
      • Western governments see 60% enrichment as undermining trust, while Iran argues it is a deterrence and bargaining tool.
    • Strategic Dimension: Keeps Iran on the nuclear threshold, enabling leverage in negotiations and projecting deterrence without overt weaponisation.
    [UPSC 2023] Consider the following statements:

    Statement-I: India, despite having uranium deposits, depends on coal for most of its electricity production.

    Statement-II: Uranium, enriched to the extent of at least 60%, is required for the production of electricity.

    Which one of the following is correct in respect of the above statements?

    (a) Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I

    (b) Both Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-1

    (c) Statement-I is correct but Statement-II is incorrect *

    (d) Statement-I is incorrect but Statement-II is correct

     

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  • Horticulture, Floriculture, Commercial crops, Bamboo Production – MIDH, NFSM-CC, etc.

    Coffee Board to hold awareness program on EUDR compliance

    Prelims Only | Agriculture | Mains Paper 3: Major Crops & Cropping Patterns

    Why in the News?

    The Coffee Board of India has launched extensive awareness and capacity-building programmes to help coffee growers register on its mobile application for EU Deforestation Regulation (EUDR) compliance.

    What are EU Deforestation Regulation (EUDR)?

    • About: Effective from June 2023; Prevent imported products like coffee, cocoa, palm oil, soy, rubber, cattle, wood (and derivatives) from being linked to deforestation.

    • Requirements:

      • Proof of production on non-deforested land (post-2020).
      • Mandatory due diligence statement with geo-coordinates.
    • Penalties: Non-compliance may attract fines up to 4% of EU turnover, seizure of products, and temporary bans.

    About Coffee Board of India:

    • Establishment: In 1942 under the Coffee Act, Section 4; Functions under the Ministry of Commerce & Industry; Headquartered at Bengaluru, Karnataka.
    • Structure: A statutory organisation comprising 33 members, with the Chairperson/CEO appointed by the Government of India.
    • Focus areas: Research, Extension, Development, Market Intelligence, Export Promotion, Domestic Promotion.
    • Early years: Coffee marketing was under the pooling system until 1995, after which liberalisation shifted marketing to the private sector.
    • Initiatives: Runs promotional campaigns like India Coffee, Walk With Coffee, and awareness on EUDR compliance for exports.

    Back2Basics: Coffee Cultivation in India:

    • Overview: Coffee introduced in 1600 AD by Baba Budan in Chikmagalur, Karnataka.
    • Geographical Spread: Grown in the Western Ghats (Karnataka, Kerala, Tamil Nadu) and in smaller areas of Andhra Pradesh, Odisha, and Northeast India.
    • Production Share: Karnataka ~ 70%, Kerala ~ 20%, Tamil Nadu ~ 7%.
    • Agro-climatic Conditions: Requires 16°–28°C temperature, 150–250 cm rainfall, and well-drained slopes; sensitive to frost, dry spells, and harsh sunlight.
    • Soil: Grows best in laterite soils of Karnataka and rich, well-drained loams.

    • Varieties:

      • Arabica: Mild aromatic flavour, high export value, but more susceptible to pests/diseases.
      • Robusta: Hardy, disease-resistant, stronger taste, higher yields.
      • Liberica:  Rare, niche cultivation.
    • Seasonality: Coffee exports peak during March–June.
    • Domestic Consumption: Rising gradually; Coffee Board promoting events like International Coffee Day (October 1) to increase per capita intake.

    Production Statistics (2025-26):

    • India’s coffee production:  It is projected at a record 4.03 lakh tonnes in 2025 up 11% from last year’s 363,000 tonnes.
      • Arabica output forecast: 118,000 tonnes, up 12% year-on-year.
      • Robusta output forecast: 285,000 tonnes, up 9.5%.
    • Karnataka contributes ~70% of output, followed by Kerala and Tamil Nadu.
    • India is the world’s 7th largest producer and 5th largest exporter, contributing 3.5% of global production and 5% of global exports.
    • Exports: Reached $1.8 billion in 2024-25, a 125% growth over 11 years (from $800 million in 2014-15).
      • Around 70% of Indian coffee is exported, mainly to Europe (Italy, Germany, Belgium), the Middle East, Japan, and Korea.

     

    [UPSC 2022] With reference to the “Tea Board” in India, consider the following statements :

    1. The Tea Board is a statutory body.

    2. It is a regulatory body attached to the Ministry of Agriculture and Farmers Welfare.

    3. The Tea Board’s Head Office is situated in Bengaluru.

    4. The Board has overseas offices at Dubai and Moscow.

    Which of the statements given above are correct ?

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

     

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  • Historical and Archaeological Findings in News

    Konkan Geoglyphs may be 24,000 years old

    Prelims Only | Art and Culture | Mains Paper 1: Arts & Culture

    Why in the News?

    The prehistoric geoglyphs of the Konkan coast may date back as far as 24,000 years, based on new stratigraphic evidence from Koloshi caves in Maharashtra.

    Konkan Geoglyphs may be 24,000 years old

    About Konkan Geoglyphs:

    • Overview: Prehistoric rock engravings (geoglyphs/petroglyphs) carved on laterite plateaus of the Konkan coast (Maharashtra, Goa, southern Karnataka).
    • Depictions: Humans, animals (elephants, tigers, rhinos, stingrays, turtles, peacocks), and abstract motifs.
    • Technique: Created by scooping, etching, pecking into laterite; grooves 3–5 cm deep, 3–4 cm wide.
    • Unique Feature: Unlike painted caves (e.g., Bhimbetka), these are open-air geoglyphs, rare in India.
    • Cultural Value: Provide insights into prehistoric ecology, rituals, and transition from hunter-gatherer to agrarian societies.

    Important Sites:

    • Maharashtra (Ratnagiri–Sindhudurg): Ratnagiri alone hosts 1,500+ carvings across 210 sq. km.
      • Kasheli: Giant elephant (13×18 m), 125+ carvings of sharks, stingrays, rhinos (though locally absent), tigers.
      • Barsu: Human figure flanked by two tigers, resembling Harappan seals. Local are protesting a proposed oil refinery which might demolish this site.
      • Rundhye Tali: Concentric circles, abstract motifs, jellyfish/tiger outlines.
      • Devache Gothane: Standing human figure; linked to magnetic deflection anomaly.
      • Devi Hasol: Snake-like square design (8 m); still part of Aryadurga temple rituals.
      • Jambharun, Ukshi, Kudopi: Faunal + abstract petroglyphs.
    • Goa:
      • Usgalimal (Phansaymal): Bulls, deer, spirals, cup marks, grinding grooves.

    History and Antiquity:

    • Dating: Traditionally ~10,000 years old; new excavations at Koloshi caves push age back to 24,000 years (cultural layers ~38,000 years).
    • Continuity: Geoglyph-making persisted till the early historic period, showing ritual and symbolic evolution.
    • Ecological Record: Depict species long extinct in Konkan (rhinoceros, hippopotamus), indicating Pleistocene fauna.
    • World Context: Compared with Nazca Lines (Peru), Atacama Giant (Chile), and Blythe Intaglios (US) — Konkan geoglyphs are smaller but more intricate and ecologically detailed.
    • UNESCO Status: On India’s Tentative List (2022); nomination under preparation for 2027–28 cycle.
    [UPSC 2024] Consider the following properties included in the World Heritage List released by UNESCO:

    1. Shantiniketan 2. Rani-ki-Vav 3. Sacred Ensembles of the Hoysalas 4. Mahabodhi Temple Complex at Bodhgaya

    How many of the above properties were included in 2023?

    Options: (a) Only one (b) Only two* (c) Only three (d) All four  

     

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  • Air Pollution

    Delhi to witness Artificial Rain through Cloud Seeding

    Prelims Only | Science Tech | Mains Paper 3: S&T – Applications In Everyday Life

    Why in the News?

    The Delhi government is planning to trial cloud-seeding to trigger artificial rain to combat air pollution ahead of winters.

    About Cloud Seeding:

    • About: It is a microclimate management technique aimed at altering precipitation patterns by dispersing substances into clouds to stimulate rainfall or snowfall.
    • Why it is used: It is used to mitigate hail, disperse fog, and either induce precipitation or prevent it from occurring in subsequent days.
    • Techniques include:
      • Static Cloud Seeding: Chemicals are introduced into cold clouds already containing supercooled water droplets, encouraging the formation of ice crystals.
      • Hygroscopic Cloud Seeding: Salts are sprayed into the base of warm clouds to act as condensation nuclei, increasing the number and size of water droplets.
      • Dynamic Cloud Seeding: This method involves boosting vertical air currents to enhance moisture passage through the clouds, leading to more rain.
    • Common Cloud Seeding Chemicals:
      • Silver iodide (AgI): Preferred for its ice-like crystalline properties.
      • Potassium iodide (KI): Functions similarly to silver iodide.
      • Dry ice (solid CO₂): Used to rapidly cool cloud droplets, aiding rain formation.
      • Liquid propane: Used in specific cloud types, effective at higher temperatures.
      • Sodium chloride and calcium chloride: Used in hygroscopic (warm) cloud seeding methods.
      • Bismuth tri-iodide (BiI₃): Sometimes used based on experimental or environmental considerations.
    • Dispersion methods range from aircraft and ground-based generators to newer approaches like drones delivering electric charges or infrared laser pulses.

    Limitations: 

    • Concerns persist regarding the potential accumulation of seeding agents in sensitive ecosystems, although detailed studies have shown negligible impacts.
    • The chemicals used, such as silver iodide, may potentially damage the environment and cause health issues like iodine poisoning in high concentrations
    [UPSC 2025] Artificial way of causing rainfall to reduce air pollution makes use of:

    (a) silver iodide and potassium iodide *

    (b) silver nitrate and potassium iodide

    (c) silver iodide and potassium nitrate

    (d) silver nitrate and potassium chloride

     

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  • Global Geological And Climatic Events

    India’s only active volcano in Andaman’s Barren Island erupts

    National Parks/WSPrelims Only | Geography | Mains Paper 1: Geographical Features & Their Location

    Why in the News?

    Barren Island, which is not only India’s but South Asia’s only active volcano, has erupted twice in a span of eight days.

    barren island

    About Barren Island:

    • Location: In the Andaman Sea, about 138–140 km northeast of Port Blair, within the Andaman and Nicobar Islands (India).
    • Unique Status: The only confirmed active volcano in the Indian subcontinent and South Asia, lying on the volcanic arc between Sumatra (Indonesia) and Myanmar.
    • Geophysical Features: Roughly circular island (~3 km diameter); volcanic crater located 0.5 km from shore, rising to 354 m above sea level and classified as a stratovolcano made of lava, volcanic ash, and rock fragments.
    • Volcanic Activity
      • First Recorded Eruption: 1787.
      • Notable Eruptions: 1789, 1795, 1803–04, 1852, 1991, 2017, and minor eruptions in 2025.
      • 1991 Eruption: Lasted ~6 months, destructive to local fauna.
      • Volcanic Explosivity Index (VEI): Generally low, around 2.
    • Geological Significance:
      • Age of Flows: Oldest subaerial lava flows dated to 1.6 million years ago.
      • Crust: Built on 106 million-year-old oceanic crust.
      • Tectonics: Part of the subduction zone where the Indian Plate meets the Burmese Plate.
      • Research Value: Critical for geological and volcanic studies as India’s only active volcano.

    Note:

    Although there are no active volcanoes in mainland India, there are some extinct and dormant volcanoes in the country. These are: Narcondam Island (dormant, A&N Islands); Deccan Plateau (18.51°N 73.43°E; extinct, Maharashtra); Baratang Island (mud volcanoes; active, A&N Islands); Dhinodhar Hills (extinct, Gujarat); Dhosi Hill (extinct, Haryana–Rajasthan border); Tosham Hills (extinct, Haryana); and Loktak Lake (Supervolcanic caldera, Manipur).

    [UPSC 2018] Consider the following statements:

    1. The Barren Island volcano is an active volcano located in the Indian territory.
    2. Barren Island lies about 140 km east of Great Nicobar.
    3. The last time the Barren Island volcano erupted was in 1991 and it has remained inactive since then.

    Which of the statements given above is/are correct?

    (a) 1 only*

    (b) 2 and 3

    (c) 3 only

    (d) 1 and 3

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