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Type: Prelims Only

  • International Space Agencies – Missions and Discoveries

    Extreme Nuclear Transients (ENTs) and the Big Bang

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

    Extreme Nuclear Transient

    Why in the News?

    New research by the University of Hawaii has discovered Extreme Nuclear Transients (ENTs), the most powerful explosions since the Big Bang, surpassing even gamma-ray bursts (GRBs) in energy output.

    Back2Basics: Big Bang

    • Proponent: In 1927 by Georges Lemaître.
    • Timeline: Universe originated ~13.7–13.8 billion years ago from a singularity.
    • Phases: Began with cosmic inflation, followed by expansion, cooling, and formation of matter, light, and four fundamental forces.
    • Cosmic Evolution: Led to atoms, stars, galaxies, and planets; universe still expanding.
    • Evidence: Supported by cosmic microwave background radiation and Hubble’s observations of galaxy redshifts.

    About Extreme Nuclear Transients (ENTs):

    • Discovery: First reported by astronomers at the University of Hawaii’s Institute for Astronomy (IfA).
    • Cause: Triggered when massive stars (≥3 times Sun’s mass) are torn apart by supermassive black holes at galactic centers.
    • Energy Output: Release ten times more energy than gamma-ray bursts (GRBs), earlier considered the brightest cosmic events.
    • Duration: Remain luminous in radio wavelengths for years, unlike short-lived bursts.

    How ENTs differ from other cosmic events?

    • Gamma-Ray Bursts (GRBs): They come from collapsing stars or mergers; short-lived but highly energetic. ENTs are more powerful and last longer.
    • Tidal Disruption Events (TDEs): TDEs also shred stars, but ENTs involve larger black holes and massive stars, making them rarer.
    • Fast X-ray Transients (FXTs): They are faint, brief X-ray bursts from trapped jets in supernovae. ENTs are brighter, multi-wavelength, and more energetic.

    Scientific Importance of ENTs:

    • Most Energetic Events: Represent the most powerful class of transients ever observed.
    • Black Hole Studies: Offer insights into supermassive black hole dynamics and their role in galactic evolution.
    • Early Universe Clues: Help probe massive stars soon after galaxy formation.
    • Future Observations: Key targets for next-generation telescopes like the Vera C. Rubin Observatory and Nancy Grace Roman Space Telescope.
    [UPSC 2012] Which of the following is/are cited by the scientists as evidence for the continued expansion of the universe?

    1. Detection of microwaves in space

    2. Observation of redshift phenomenon in space

    3. Movement of asteroids in space

    4. Occurrence of supernova explosions in space

    Select the correct answer using the code given below:

    (a) 1 and 2 * (b) 2 only (c) 1, 3 and 4 (d) None of the above.

     

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  • Innovations in Sciences, IT, Computers, Robotics and Nanotechnology

    How different are Supercomputers to normal computers?

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

    Why in the News?

    This newscard is an excerpt from the original article published in The Hindu.

    What is a Supercomputer?

    • Overview: A high-performance computing system capable of trillions to quintillions of calculations per second.
    • Parallel Computing: Uses thousands of processors working together instead of relying on a single fast processor.
    • Applications: Climate modelling, nuclear simulations, black hole research, drug discovery, and artificial intelligence training.
    • Performance Measure: FLOPs (floating-point operations per second); advanced machines now achieve exaflop levels (10¹⁸ calculations/sec).

    How Supercomputers Differ from Normal Computers

    • Speed: Laptops perform billions of FLOPs; supercomputers perform quintillions.
    • Parallelism: PCs use one or few processors; supercomputers employ thousands to millions of cores.
    • Structure: Built of interconnected nodes (processor + memory bundles) linked by ultra-fast networks.
    • Storage: Manage petabytes of data, unlike gigabytes/terabytes in personal devices.
    • Cooling & Power: Need specialised cooling (water/immersion) and consume electricity equal to a small town.
    • Usage: PCs run interactive apps; supercomputers run scheduled jobs remotely for scientists and researchers.

    India’s journey in Supercomputing:

    • Early Efforts: Began with C-DAC’s PARAM 8000 (1991) after Western import restrictions.
    • National Supercomputing Mission (2015): Jointly by DST & Ministry of Electronics and IT; implemented by C-DAC and IISc to build 70+ systems.
    • Major Systems (2025):
      • AIRAWAT-PSAI (C-DAC, Pune) – fastest in India (8.5 PF, global rank 136).
      • PARAM Siddhi-AI – global AI leader.
      • Pratyush (IITM, Pune) – weather & climate (3.76 PF).
      • Mihir (NCMRWF, Noida) – medium-range weather (2.57 PF).
      • PARAM Pravega (IISc, Bengaluru) – academic use (>3.3 PF).
    • Indigenous Push: PARAM Rudra (2024) with Indian servers and software stack.
    • Applications: Monsoon forecasting, Himalayan research, defence simulations, AI, drug design, materials science.
    • Current Capacity: 34+ supercomputers with ~35 petaflops; plans for exascale systems underway.
    [UPSC 2014] Param Padma, which was in the news recently, is:

    (a) a new Civilian Award instituted by the Government of India

    (b) the name of a supercomputer developed by India *

    (c) the name given to a proposed network of canals linking northern and southern rivers of India

    (d) a software programme to facilitate e-governance in Madhya Pradesh

     

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  • Biofuel Policy

    Is it feasible to blend Isobutanol and Diesel? 

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

    Why in the News?

    The Union Transport Minister has announced that the Automotive Research Association of India (ARAI) is studying the feasibility of blending Isobutanol with Diesel after ethanol–diesel blending attempts failed.

    About Isobutanol:

    • What is it: A four-carbon alcohol (C₄H₁₀O), clear, flammable, and traditionally used as a solvent in paints, coatings, and chemical industries.
    • Production: Derived either from petrochemical processes or by fermenting sugarcane, molasses, and grains with engineered microbes.
    • Fuel Properties:
      • Higher energy density than ethanol, closer to diesel.
      • Lower hygroscopicity (absorbs less water), reducing rust and corrosion in engines and pipelines.
      • Higher flash point than ethanol, making it safer for storage and transport.

    Isobutanol–Diesel Blending and Benefits:

    • Compatibility: Unlike ethanol, isobutanol blends well with diesel without extra chemicals.
    • Economic Feasibility: Can be produced in existing ethanol plants with minor changes.
    • Agricultural Support: Creates demand for sugarcane by-products, helping farmers and managing sugar surplus.
    • Energy Security: Reduces reliance on imported fossil fuels and saves foreign exchange.
    • Global First: Pilot studies may make India the first country to use isobutanol–diesel blends.

    Challenges and Risks:

    • Combustion Issues: Has a lower cetane number than diesel, causing poor combustion quality.
    • Engine Risks: Can trigger diesel knock (uneven burning, power loss, engine damage).
    • Mixing Limitations: Blending challenges exist but can be partly solved with biodiesel addition.
    • Cost Factor: Requires additives to restore cetane number, increasing costs.
    • Blending Limit: Experts suggest ≤10% blending to avoid harm.
    • Pilot Phase: Testing will take ~18 months before possible large-scale adoption.
    [UPSC 2020] With reference to green hydrogen, consider the following statements:

    1. It can be used directly as a fuel for internal combustion.

    2. It can be blended with natural gas and used as fuel for heat or power generation.

    3. It can be used in the hydrogen fuel cell to run vehicles.

    How many of the above statements are correct?

    Options: (a) Only one (b) Only two (c) All three* (d) None

     

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  • Air Pollution

    ‘Smog-eating’ photocatalytic coatings on roads to curb pollution

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

    Why in the News?

    Delhi government has announced a feasibility study to test photocatalytic coatings on roads, pavements, and public spaces to bring visible improvements in air quality.

    About Smog:

    • Overview: Combination of smoke and fog, forming smoky fog with soot, gases, and moisture.
    • Components: Includes soot particulates, sulphur dioxide (SO₂), nitrogen dioxide (NO₂), hydrocarbons, carbon monoxide (CO), and ozone (O₃).

    • Types:

      1. Sulfurous Smog (London Smog) – Caused by burning coal and sulphur-bearing fuels; worsened by dampness and particulates.
      2. Photochemical Smog (Los Angeles Smog) – Produced when NOₓ and hydrocarbons react under sunlight, forming ozone; appears as a brownish haze with respiratory effects.

    • Pollutants:

      1. Primary pollutants: Directly emitted (NO₂, SO₂, hydrocarbons).
      2. Secondary pollutants:  Formed via reactions (ozone, acid rain).
    • Haze vs. Smog: Haze = dry particles reducing visibility; Smog = pollutants with condensation.
    • Effects: Respiratory distress, eye irritation, plant damage, reduced visibility, carcinogenic risk, worsened by inversion layers and low rainfall.

    What are “Smog-Eating” Coatings?

    • Technology: Photocatalytic coatings using titanium dioxide (TiO₂) on roads, pavements, and public surfaces.
    • Function: Under sunlight, TiO₂ breaks down pollutants like NO₂ and hydrocarbons into less harmful compounds.
    • Advantages: Low-cost, stable, compatible with traditional materials, effective in depollution and creating self-cleaning surfaces.

    Delhi Government Plan

    • Plan: If viable, Cabinet proposal for citywide rollout at busy corridors, markets, and public spaces.
    • Evaluation: Study to assess cost-effectiveness, safety, and sustainability while shortlisting suppliers.
    • Strategic Context: Part of a 24×7, year-round environmental action plan using technology-driven interventions.
    [UPSC 2013] Photochemical smog is a resultant of the reaction among-

    (a) NO₂, O₃ and peroxyacetyl nitrate in the prescence of sunlight *

    (b) CO₂, O₂, and peroxyacetyl nitrate in the presence of sunlight

    (c) CO, CO₂, and NO₂ at low temperature

    (d) high concentration of NO₂, O₃ and CO in the evening

     

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  • Supreme Court cites Preamble to reject a plea

    Prelims OnlySC Judgements | Polity | Mains Paper 2: Indian Constitution – historical underpinnings, evolution, features, amendments, significant provisions and basic structure

    Why in the News?

    The Supreme Court rejected a plea against a religious leader inaugurating Mysuru Dasara, reminding that the Preamble upholds secularism, liberty, equality, and fraternity as core ideals of unity.

    Backgrounder:

    • The Karnataka government invited Banu Mushtaq, 2025 International Booker Prize winner, to inaugurate Mysuru Dasara Festival and perform the pooja.
    • A 2023 video resurfaced where she questioned the worship of Goddess Bhuvaneshwari, sparking controversy.
    • BJP and others opposed the invite, for her selective criticism of Hindu rituals and demanded withdrawal of the invite sent to her.

    Supreme Court’s Observations:

    • Secular Character: The Court reminded that the Preamble enshrines secularism, liberty, equality, and fraternity as unifying ideals.
    • State’s Neutrality: Dasara inauguration was a State event, not a private ritual. The State “maintains no religion of its own” (echoing M. Ismail Faruqui, 1994).
    • Key Precedents Recalled:
      • Kesavananda Bharati (1973) & S.R. Bommai (1994): Secularism = basic feature of the Constitution.
      • R.C. Poudyal (1994): Even before “secular” was inserted (42nd Amendment, 1976), the Constitution upheld equal treatment of all faiths.
      • Dr. Balram Singh v. UOI (2024): State can intervene to curb religious practices impeding equality & development.

    Preamble

    About the Preamble:

    • Nature: Introductory statement; reflects philosophy, vision, and objectives.
    • Origin: Based on Objectives Resolution (Nehru, 1946); adopted 1947.
    • Declarations: India as Sovereign, Socialist, Secular, Democratic, Republic ensuring Justice, Liberty, Equality, Fraternity.

    • Symbolism:

      1. Source of Authority: “We, the People of India.”
      2. Nature of State: Sovereign, Socialist, Secular, Democratic, Republic.

    Amendment of the Preamble:

    • Permissible: Supreme Court (Kesavananda Bharati, 1973) has held that Preamble is part of Constitution and can be amended without violating Basic Structure.
    • Only Amendment: 42nd Constitutional Amendment Act, 1976 (during Emergency).
      • Added “Socialist” and “Secular” between Sovereign and Democratic.
      • Added “Integrity” to Unity of the Nation.

    Key Judicial Pronouncements:

    • Berubari Union Case (1960): Preamble not a part of the Constitution; only a tool for interpretation.
    • Kesavananda Bharati Case (1973): Overruled Berubari; Preamble is part of the Constitution, embodies basic structure but cannot override provisions.
    • S.R. Bommai Case (1994): Secularism upheld as basic feature of the Constitution.
    • LIC of India Case (1995): Reaffirmed Preamble as integral, but non-justiciable (not enforceable in court).
    [UPSC 2020] The Preamble to the Constitution of India is:

    Options: (a) a part of the Constitution but has no legal effect

    (b) not a part of the Constitution and has no legal effect either

    (c) part of the Constitution and has the same legal effect as any other part

    (d) a part of the Constitution but has no legal effect independently of other parts*

     

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  • Electoral Reforms In India

    Registered Unrecognised Political Parties (RUPP)

    Prelims Only | Polity | Mains Paper 2: Representation Of People’s Act

    Why in the News?

    The Election Commission de-listed 474 Registered Unrecognised Political Parties (RUPP) for not contesting polls in six years, as part of its electoral clean-up drive.

    Delisting of Political Parties:

    • ECI’s Powers: Governed by Section 29A, RP Act, 1951.
      • No explicit power with ECI to de-register a party once registered, except for fraud or anti-Constitutional allegiance.
    • Judicial Interpretation:
      • INC vs Institute of Social Welfare (2002): SC ruled that ECI cannot de-register parties, only delist or declare inactive, which removes privileges but NOT their legal entity.

    About Registered Unrecognised Political Parties (RUPPs):

    • Constitutional Right: Right to form political associations is guaranteed under Article 19(1)(c).
    • Registration: RUPPs are political associations registered with the Election Commission of India (ECI) under Section 29A, Representation of the People Act, 1951.
    • Not recognised: As either State or National parties because they have not secured the required vote share or seats in past elections.
    • Privileges & Benefits:
      • Tax exemption under Section 13A, Income Tax Act, 1961.
      • Eligibility for common poll symbols during elections (under Symbols Order, 1968).
      • Can nominate up to 20 star campaigners.
    • Obligations:
      • Must contest elections periodically.
      • File annual audit accounts and contribution reports.
      • Disclose donations above ₹20,000.
      • Ensure no donations above ₹2,000 are taken in cash.
    • Issues: Many RUPPs exploit privileges without contesting elections, crowding out genuine contesting parties and confusing voters.

    What are Recognised Political Parties?

    • Types: Recognised parties are classified as National Parties or State Parties.
    • Privileges:
      • Exclusive reserved symbols.
      • Free copies of electoral rolls.
      • Broadcasting time on Doordarshan/All India Radio.
      • Consultation rights with ECI in election matters.
    • Recognition depends on vote share or seats won in Lok Sabha/Assembly elections.

    Conditions for Recognition:

    National Party State Party
    Secures 6% of valid votes in Lok Sabha/Assembly elections in any 4 or more states + wins 4 Lok Sabha seats. Secures 6% of valid votes in the state Assembly election + wins 2 Assembly seats.
    Wins 2% of Lok Sabha seats (currently 11 seats) from at least 3 states. Secures 6% of valid votes in the state’s Lok Sabha election + wins 1 Lok Sabha seat.
    Recognised as a State Party in 4 or more states. Wins 3% of Assembly seats or 3 seats (whichever is higher) in the state Assembly.
    — Wins 1 Lok Sabha seat for every 25 seats allotted to that state.
    — Secures 8% of total valid votes in the state’s Assembly or Lok Sabha election (added in 2011).

     

    [UPSC 2001] Consider the following statements regarding the political parties in India:

    1. The Representation of the People Act, 1951 provides for the registration of political parties.

    2. Registration of political parties is carried out by the Election Commission.

    3. A national level political party is one which is recognised in four or more States.

    4. During the 1999 general elections, there were six National and 48 State level parties recognised by the Election Commission.

    Options: (a) I, II and IV (b) I and III (c) II and IV (d) I, II, III and IV*

     

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  • ISRO Missions and Discoveries

    Gaganyaan Analog Experiments (Gyanex)

    Prelims Only | Science Tech | Mains Paper 3: Achievements Of Indians In S&T

    Why in the News?

    Gyanex (Gaganyaan Analog Experiments) ground-based astronaut simulations are being conducted by ISRO with ICMR and Institute of Aerospace Medicine, Bengaluru, to prepare Indian astronauts for the 2027 Gaganyaan mission.

    What are Gaganyaan Analog Experiments (Gyanex)?

    • Purpose: India’s first systematic programme in space medicine and astronaut psychology, preparing protocols for Gaganyaan and future missions like space stations and lunar expeditions.
    • Setup: Conducted at the Institute of Aerospace Medicine, Bengaluru, with ICMR support. Astronauts and defence personnel live in a mock spacecraft simulator under confinement, consuming DRDO-developed space food.
    • Activities: Strict space-like routines involving scientific experiments, resource management, schedules, and limited supplies. Tests also cover communication with time-delay simulation.
    • Gyanex-1: Group Captain Angad Pratap and two others confined for 10 days; completed 11 experiments on psychology, biomedicine, and communications.
    • Microgravity Simulation: Weightlessness cannot be reproduced on Earth; instead, 7-day bed-confinement at 6° head tilt studied microgravity effects.
    • Other Indian Analog Missions:
      • Ladakh Human Analog Mission (Nov 2024): Simulated interplanetary survival in cold, barren terrain.
      • HOPE Habitat at Tso Kar (Aug 2025): Tested 8 m habitat + 5 m utility module in Mars-like conditions of low pressure, saline permafrost, and high UV radiation.

    About Gaganyaan Mission:

    • Overview: India’s first human spaceflight mission, initiated in 2007, to send 3 astronauts into Low Earth Orbit (400 km) for 3 days, followed by Arabian Sea splashdown.
    • Rocket: Human-Rated LVM3 (HLVM3), adapted from GSLV Mk3, certified in 2025 for safe human use.
    • Significance: India to become the 4th nation (after US, Russia, China) with crewed spaceflight capability.
    • Latest Timeline (as of Sept 2025):
      • Dec 2025: First uncrewed mission (G1) with humanoid Vyommitra.
      • 2026: Two more uncrewed flights for life-support, avionics, and escape tests.
      • Early 2027: First crewed mission – 3 astronauts in orbit for 3 days.
    • Progress so far:
      • 80–85% development complete: avionics, parachutes, crew safety systems validated.
      • Integrated Air Drop Test (Aug 2025): Confirmed crew module deceleration.
      • Crew Escape System: Multiple ground and flight tests successful.
      • Recovery: Indian Navy and Australian Space Agency conducting splashdown drills.
      • Four IAF test pilots shortlisted: Shubhanshu Shukla, Prasanth Balakrishnan Nair, Angad Pratap, Ajit Krishnan.
      • All trained in Russia, now in advanced Indian training. Final crew of three will be chosen for maiden flight.
    [UPSC 2016] Consider the following statements: The Mangalyaan launched by ISRO

    1. is also called the Mars Orbiter Mission

    2. made India the second country to have a spacecraft orbit the Mars after USA

    3. made India the only country to be successful in making its spacecraft orbit the Mars in its first attempt.

    Select the correct answer using the code given below:

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

     

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  • Water Management – Institutional Reforms, Conservation Efforts, etc.

    Ecological Impact of the ELSA 3 Shipwreck in the Arabian Sea

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

    Why in the News?

    The sinking of the ELSA 3 ship off the Kerala coast in May led to a significant ecological disruption in the south-eastern Arabian Sea, a new study has confirmed.

    Ecological Impact of the ELSA 3 Shipwreck in the Arabian Sea

    About the Pollution and Contaminants:

    • Oil Slick: Wreck of ELSA 3 released petroleum pollutants, initially forming a slick of about 2 square miles.
    • Polyaromatic Hydrocarbons (PAHs): Compounds like naphthalene, fluorene, anthracene, phenanthrene, fluoranthene, pyrene detected; toxic, carcinogenic, and bioaccumulative.
    • Naphthalene Marker: High levels confirmed continuous leakage from fuel tanks.
    • Trace Metals: Nickel, lead, copper, vanadium found in elevated levels in water and sediments, worsening toxicity.
    • Distribution: Oil spread shifted with sea turbulence—first mid-depth concentration, later visible on the surface.

    Ecological Impacts of the Oil Spill:

    • Plankton: Zooplankton showed pollutant accumulation, marking entry into the marine food chain.
    • Fish Eggs & Larvae: Collected in the southwest monsoon spawning season displayed decay and mortality, threatening commercial species recruitment.
    • Benthic Organisms: Sensitive species declined within days; only pollution-tolerant worms and bivalves survived, reflecting seabed stress.
    • Higher Fauna: Brown Noddy seabird (Anous stolidus) recorded with oil-soaked plumage, highlighting risks to birds and larger marine life.
    • Overall Effect: A multi-level disruption from plankton to fish stocks to seabirds.

    Microbial Response and Bioremediation:

    • Bacterial Diversity: Metagenomic studies found hydrocarbon-degrading bacteria near the wreck.
    • Key Strains: Neptunomonas acidivorans, Halomonas tabrizica, Acinetobacter baumannii detected.
    • Implications: Their presence reflects both severe contamination and natural bioremediation potential.
    • Outlook: Microbial action may reduce pollution gradually, but contamination in the Arabian Sea remains significant.
    [UPSC 2017] In the context of solving pollution problems what is/are the advantage/disadvantages of bioremediation technique?

    1. It is a technique for cleaning up pollution by enhancing the same biodegradation process that occurs in nature.

    2. Any contaminant with heavy metals such as cadmium and lead can be readily and completely treated by bioremediation using microorganisms.

    3. Genetic engineering can be used to create microorganisms specifically designed for bioremediation.

    Select the correct answer using the code given below:

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

     

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  • Iran’s Nuclear Program & Western Sanctions

    US revokes sanctions waiver on Chabahar Port

    Prelims Only | International Relations | Mains Paper 2: Effect Of Policies & Politics Of World On India’S Interests

    Why in the News?

    The U.S. has ended the 2018 waiver that let India use Iran’s Chabahar Port for Afghanistan’s reconstruction, revoking it within 10 days.

    US revokes sanctions waiver on Chabahar Port

    About Chabahar Port:

    • Location: Deep-water port in Sistan-Baluchistan province of Iran, on the Gulf of Oman at the mouth of the Strait of Hormuz.
    • Unique Feature: The only Iranian port with direct access to the Indian Ocean.
    • Distances: Kandla Port, Gujarat – 550 nautical miles, Mumbai – 786 nautical miles from Chabahar.
    • Structure: Comprises Shahid Beheshti and Shahid Kalantari terminals.
    • Connectivity Potential: Its proximity to Afghanistan, Pakistan, and India and position on the International North-South Transport Corridor (INSTC) gives it the ability to become a major commercial hub.
    • INSTC: A multi-modal route linking the Indian Ocean and Persian Gulf to the Caspian Sea via Iran, and onward to northern Europe via Russia.

    India’s Engagements for Chabahar Port:

    • Tripartite Agreement (2016): India, Iran, and Afghanistan agreed to develop the Shahid Beheshti terminal, marking India’s first foreign port project.
    • Infrastructure Goals: Develop the port and build a rail line to Zahedan, bypassing Pakistan to reach Afghanistan and Central Asia.
    • Recent Developments: In May 2024, India Ports Global Ltd (IPGL) signed a 10-year lease to operate Shahid Beheshti.
    • Commitments: India pledged $120 million in equipment and a $250 million credit line.
    • Operations: India supplied 6 harbour cranes; facilitated shipments of 2.5 million tonnes of wheat and 2,000 tonnes of pulses to Afghanistan.

    Implications of US Sanctions for India:

    • Economic Setback: Jeopardises India’s ₹200 crore investment and future projects.
    • Connectivity Loss: Cuts India’s only direct maritime gateway to Afghanistan, Central Asia, and INSTC.
    • Strategic Impact: Weakens India’s counter to China’s Gwadar Port in Pakistan under CPEC.
    • Diplomatic Strain: Risks tensions with Iran (strategic partner) and the United States (major trade partner).
    • Operational Challenges: Sanctions may deter shippers, insurers, and suppliers, slowing port activity.
    [UPSC 2017] What is the importance of developing Chabahar Port by India?

    Options: (a) India’s trade with African countries will enormously increase.

    (b) India’s relations with oil-producing Arab countries will be strengthened.

    (c) India will not depend on Pakistan for access to Afghanistan and Central Asia *

    (d) Pakistan will facilitate and protect the installation of a gas pipeline between Iraq and India

     

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  • 7 Natural Heritage Sites from India added to UNESCO’s Tentative List

    Prelims Only | Geography | Mains Paper 1: Geographical Features & Their Location

    Why in the News?

    Seven natural heritage sites from India were added to UNESCO’s Tentative List of World Heritage Sites, raising India’s tally from 62 to 69 places.

    About the 7 newly added UNESCO Tentative List Sites:

    Site

    Detailed Facts
    Deccan Traps (Panchgani & Mahabaleshwar, Maharashtra) • One of the world’s largest volcanic provinces (~66 mya)
    • Basalt lava flows covering ~500,000 sq. km
    • Step-like “trap” topography, fossil beds, red bole layers
    • Linked to end-Cretaceous mass extinction
    • Part of Western Ghats; within Koyna Wildlife Sanctuary
    St. Mary’s Island Cluster (Udupi, Karnataka) • Four islands in Arabian Sea near Udupi
    • Famous for hexagonal/polygonal rhyolitic lava columns (~85–88 mya)
    • Formed during breakup of India–Madagascar
    • Declared National Geo-heritage Monument (2016)
    • Rare acidic lava formations, unique in India
    Meghalayan Age Caves (East Khasi Hills, Meghalaya) • Mawmluh Cave is type locality for Meghalayan Age (~4,200 years ago)
    • Records global drought event in late Holocene
    • Meghalaya has longest sandstone cave (Krem Puri – 24.5 km)
    • Karst systems preserve stalagmites, paleoclimate archives
    • Culturally significant to Khasi tribes; threatened by mining
    Naga Hill Ophiolite (Nagaland) • 200 km belt of uplifted oceanic crust & mantle rocks
    • Composed of gabbro, peridotite, basalt
    • Formed at supra-subduction / mid-ocean ridge zones
    • Later thrust onto Indian continental plate
    • Only major ophiolite exposure in India; National Geological Monument
    Erra Matti Dibbalu (Red Sand Hills, Andhra Pradesh) • Quaternary-age coastal red sand mounds (~12,000–18,500 years old)
    • Spread over 5 km near Visakhapatnam
    • Derived from ancient Khondalite rocks
    • Record climate shifts, sea-level oscillations, monsoon history
    • Mesolithic–Neolithic artefacts found; National Geo-heritage Monument
    Tirumala Hills (Tirupati, Andhra Pradesh) • Famous for Eparchaean Unconformity (1.5 billion-year gap)
    • Boundary between Archaean gneiss & Proterozoic quartzites
    • Hosts Silathoranam natural arch, rare erosional landform
    • Hills rise to ~900 m; part of Cuddapah Basin
    • Combines geological, tectonic, and spiritual significance
    Varkala Cliff (Kerala) • Coastal cliff escarpment up to 80 m high
    • Exposes Mio-Pliocene Warkalli Formation (1.3–25 mya)
    • Fossiliferous sedimentary rocks beside sea (rare in India)
    • Natural springs and aquifers emerge from cliff face
    • Declared National Geological Monument; major tourism hub (Papanasam Beach)

    Back2Basics: UNESCO’s Tentative List

    • What is it: An inventory of cultural and natural sites that a member country plans to nominate for future World Heritage status.
    • Requirement: A site must stay on this list for at least one year before nomination.
    • Purpose: Allows UNESCO to assess Outstanding Universal Value (OUV) and plan conservation.
    • Note: Not all sites on the Tentative List become World Heritage Sites.
    • World Heritage Sites (WHS): Cultural, natural, or mixed sites recognised under the 1972 World Heritage Convention for their OUV.
    • Categories of WHS:
      • Cultural: Temples, monuments, forts, archaeological remains.
      • Natural: National parks, caves, biodiversity zones.
      • Mixed: Sacred landscapes with both cultural and natural value.
    • 10 Criteria for Selection: A site must satisfy at least one of these:
      • Cultural (i–vi): Masterpiece of human genius; interchange of values; unique cultural testimony; outstanding architecture/landscape; example of settlement/land use; linked to events, traditions, or ideas of universal significance.
      • Natural (vii–x): Exceptional natural beauty; example of Earth’s history; ecological or biological processes; key habitats for in-situ biodiversity conservation and threatened species.
    • India: It is currently a member of the UNESCO World Heritage Committee (2021–2025 term); Has 42 World Heritage Sites (34 cultural, 7 natural, 1 mixed).
    [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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