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Subject: Science and Technology

  • Bird Flu is Spreading in Bihar

    Why in the News?

    Bihar is currently facing a bird flu outbreak, yet the state lacks a dedicated testing facility for confirming cases.

    What is H5N1 Bird Flu?

    • H5N1 (Avian Influenza A) is a highly contagious virus affecting birds and some mammals.
    • It was first detected in China in 1996 and has since spread globally, including India.
    • In 2020, a highly pathogenic strain emerged, leading to outbreaks in Europe, Africa, Asia, and the Americas.

    Impact of H5N1 on Animals:

    • Wild birds, especially endangered species like California condors, have suffered mass casualties.
    • The virus previously targeted poultry, but now marine mammals (sea lions, dolphins) and terrestrial mammals (foxes, bears, pumas, minks) are also infected.
    • India’s first H5N1 outbreak occurred in Maharashtra and Gujarat in 2015.

    Human Risk and Potential Transmission:

    • Direct human infections are rare and usually occur through close contact with infected birds.
    • Climate change is worsening the spread, altering bird migration patterns and increasing interspecies interactions.
    • Human-to-human transmission is uncommon, but experts warn that mutations could make it possible in the future.

    PYQ:

    [2015] H1N1 virus is sometimes mentioned in the news with reference to which one of the following diseases?

    (a) AIDS

    (b) Bird flu

    (c) Dengue

    (d) Swine flu

     

  • Aditya-L1 Mission: Scientists observe a Flareless Coronal Mass Ejection

    Why in the News?

    India’s first solar mission, Aditya-L1, has made a significant scientific observation—a flareless Coronal Mass Ejection (CME) using the Visible Emission Line Coronagraph (VELC) Payload.

    About Flareless Coronal Mass Ejection (CME)

    • A Flareless CME is a solar eruption that occurs without an associated solar flare.
    • Unlike typical CMEs, which are often linked to intense bursts of electromagnetic radiation, flareless CMEs result from magnetic instabilities in the solar corona without sudden energy releases.

    Key Features of Flareless CMEs:

    • No Solar Flare Trigger: Unlike most CMEs, they do not originate from an intense energy burst.
    • Magnetic Instability Driven:  Plasma ejection occurs due to internal rearrangements in the Sun’s magnetic field.
    • Gradual Energy Release: These CMEs may expand more slowly compared to CME-flare events.
    • Scientific Significance: Helps differentiate CME mechanisms from flare activities, improving space weather forecasts.

    About the Aditya-L1 Mission

    • Aditya-L1 is India’s first space-based observatory dedicated to solar studies.
    • Launched by ISRO, it is positioned at Lagrange Point 1 (L1), about 1.5 million km from Earth.
    • It takes 125 days to reach L1, where gravitational equilibrium allows continuous solar observation.
    • It is India’s second space observatory after AstroSat (2015).
    • Mission Objectives:
      • Study the solar corona, photosphere, chromosphere, and solar wind dynamics.
      • Monitor solar activity, flares, and CMEs to predict space weather events.
      • Provide early warnings for geomagnetic storms affecting Earth’s satellites and power grids.
    • Scientific Instruments:
      1. Visible Emission Line Coronagraph (VELC): Observes the solar corona and tracks CMEs.
      2. Solar Ultraviolet Imaging Telescope (SUIT): Captures images of the Sun’s lower atmosphere.
      3. Solar Low Energy X-ray Spectrometer (SoLEXS):  Measures soft X-ray emissions from the Sun.
      4. High Energy L1 Orbiting X-ray Spectrometer (HEL1OS): Detects high-energy solar X-rays.
      5. Aditya Solar Wind Particle Experiment (ASPEX): Studies solar wind particles and their impact on space weather.
      6. Plasma Analyser Package for Aditya (PAPA): Analyzes plasma properties in the solar wind.
      7. Magnetometer: Measures magnetic field variations at L1.

    PYQ:

    [2022] If a major solar storm (solar flare) reaches the Earth, which of the following are the possible effects on the Earth ?

    1. GPS and navigation systems could fail.

    2. Tsunamis could occur at equatorial regions.

    3. Power grids could be damaged.

    4. Intense auroras could occur over much of the Earth.

    5. Forest fires could take place over much of the planet.

    6. Orbits of the satellites could be disturbed.

    Select the correct answer using the code given below:

    (a) 1 and 2 only (b) 3 and 4 only (c) 1, 3, 4 and 6 only (d) 2, 5 and 6 only

     

  • Centre makes ‘Quantum Hub’ operational

    Why in the News?

    The Government of India has launched four Thematic Hubs (T-Hubs) for quantum computing research, with Uttar Pradesh receiving the highest allocation of ₹28.7 crore for quantum technology development in FY 2024-25, followed by Karnataka, Maharashtra, Delhi, and Tamil Nadu.

    About the Quantum Hubs

    • Quantum Hubs, also known as Thematic Hubs (T-Hubs), are specialized research centres established under India’s National Quantum Mission (NQM).
    • They are designed to drive innovation, research, and development in different aspects of quantum technology.
    • Four T-Hubs have been established in leading academic institutions.
    • Each hub focuses on a specific domain of quantum research:
      1. Quantum Computing (IISc Bengaluru).
      2. Quantum Communication (IIT Bombay).
      3. Quantum Sensing & Metrology (IIT Delhi).
      4. Quantum Materials & Devices (IIT Madras).
    • IIT Kanpur serves as the management coordinating center, overseeing administration and funding allocation.
    • The hubs operate across 17 States and 2 Union Territories, with 14 technical research groups collaborating on different projects.

    About National Quantum Mission (NQM)

    • The NQM was launched by the Union Cabinet on April 19, 2023, with a total budget of ₹6,003.65 crore for a period of eight years (2023-2031).
    • It is implemented by the Department of Science & Technology (DST), Ministry of Science & Technology.
    • The mission aims to build intermediate-scale quantum computers, starting with:
      1. 20-50 qubits in 3 years,
      2. 50-100 qubits in 5 years, and
      3. 50-1,000 qubits in 8 years.
    • Additionally, it seeks to establish satellite-based quantum communication over 2,000 km within India, inter-city quantum key distribution (QKD), and multi-node quantum networks.

    PYQ:

    [2022] Which one of the following is the context in which the term “qubit” is mentioned?

    (a) Cloud Services

    (b) Quantum Computing

    (c) Visible Light Communication Technologies

    (d) Wireless Communication Technologies

     

  • What is Hantavirus and how does it spread?

    Why in the News?

    Betsy Arakawa, wife of Oscar-winning actor Gene Hackman, died from a respiratory illness linked to hantavirus, a rare disease transmitted by infected rodents, officials have confirmed.

    What is Hantavirus?

    • Hantavirus is a family of viruses carried by rodents that cause severe illnesses in humans. The two primary diseases it causes are:
    1. Hantavirus Pulmonary Syndrome (HPS) – A fatal respiratory illness common in the Americas.
    2. Hemorrhagic Fever with Renal Syndrome (HFRS) – Affects the kidneys and causes internal bleeding, mostly found in Asia and Europe.
    • Hantavirus spreads through contact with infected rodent waste, primarily via:
      • Inhalation (Aerosolization) – Breathing in airborne particles from rodent urine, droppings, or saliva.
      • Direct Contact – Touching contaminated surfaces and then touching the eyes, nose, or mouth.
      • Open Wounds – Virus entering through cuts or scratches.
      • Rodent Bites (Rare).
      • Human-to-Human Transmission – Extremely rare, except for Andes virus in South America.

    Is there a Cure or Treatment?

    • No specific antiviral treatment or vaccine exists.
    • Medical care focuses on symptom management:
      • Oxygen therapy for breathing difficulties.
      • ICU support & mechanical ventilation in severe cases.
    • Early detection is crucial – Seek medical help immediately after potential rodent exposure.

  • ISRO undocks SpaDex Satellites in First Attempt

    Why in the News?

    India achieved a major milestone in space docking technology with the successful undocking of satellites under the SpaDeX mission, marking ISRO’s first-ever undocking operation on March 14, 2025, just two months after the initial docking.

    With this success, India joins an elite group of nations—the U.S., Russia, and China—that have demonstrated space docking and undocking capabilities.

    What is PSLV-C60 SpaDeX Mission?

    • The PSLV-C60 SpaDeX Mission is a landmark mission aimed at demonstrating in-space docking and undocking technology.
    • This mission would position India as the fourth country in the world to master space docking, following the US, Russia, and China.
    • Objective:
      • To demonstrate the docking, undocking, and rendezvous capabilities of two satellites in low-Earth orbit (LEO).
      • Facilitate power transfer between docked spacecraft, an essential capability for future space missions.
    • Satellites: (Each weighing 220kg.)
      • SDX01 (Chaser): Equipped with a High-Resolution Camera (HRC).
      • SDX02 (Target): Carries a Miniature Multispectral Payload (MMX) and a Radiation Monitor (RadMon).
    • Configuration:
      • The satellites will be launched using the Polar Satellite Launch Vehicle (PSLV-C60) in a core-alone (CA) configuration, meaning without strap-on boosters.
      • They will be placed in a 476-km circular orbit with an inclination of 55°.
    • Post-Docking:
      • After the docking demonstration, the satellites will continue standalone missions for two years, conducting imaging, natural resource monitoring, and radiation environment studies.
    • Significance: It is a strategic step towards several ambitious space objectives, including:
      • Preparing for the Gaganyaan human spaceflight program
      • Enabling Chandrayaan-4 lunar sample return missions
      • Developing the Bharatiya Antariksh Station (BAS), India’s proposed space station35

    What is Space Docking?

    • Space docking refers to the process where two spacecraft in orbit rendezvous and physically connect to form a single entity. It is a highly complex and precise maneuver essential for advanced space missions.
    • Key Steps of Space Docking:
    1. Rendezvous: Involves bringing two spacecraft into the same orbit with minimal distance and velocity difference.
    2. Docking: Establishing a mechanical connection between the spacecraft using specialized docking systems.
    3. Power and Resource Sharing: Once docked, the spacecraft can transfer power, fuel, or crew to support joint operations.

     

    PYQ:

    [2018] “The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining between the craft.” The experiment in question refers to-

    Options:

    (a) Voyager-2  (b) New Horizons (c) LISA Pathfinder (d) Evolved LISA

     

  • Neurobiological basis of Substance Abuse Addiction

    Why in the News?

    A groundbreaking study at the University of British Columbia, published in Nature Mental Health, reveals that addiction involves a complex neural circuit regulating cravings, emotions, and decision-making, shifting approaches to treatment and recovery.

    Key Findings of the Research:

    • Addiction Alters a Network of Brain Regions:  A multi-center study analyzing 144 neuroimaging studies with 9,000 participants confirmed that addiction does not affect isolated brain areas but rather disrupts a circuit responsible for craving, emotional regulation, and decision-making.
    • Brain’s Reward System is Hijacked: The nucleus accumbens releases dopamine, reinforcing pleasurable behaviors. Addictive substances exploit this mechanism, making substance use compulsive over time.
    • Withdrawal Causes Emotional Distress: The extended amygdala triggers stress, anxiety, and irritability when substance use stops, driving continued consumption to avoid discomfort.
    • Decision-Making is Impaired: The prefrontal cortex weakens, reducing impulse control and rational thinking, making quitting extremely difficult despite awareness of harm.
    • Adolescents are More Vulnerable: Since the prefrontal cortex matures last, early substance exposure increases long-term addiction risk.
    • Neuroadaptations Persist Even After Abstinence: Brain changes caused by addiction do not immediately reverse, leading to relapse vulnerability even after long periods of sobriety.

    The Three-Stage Cycle of Addiction

    • Binge/Intoxication Stage (Basal Ganglia – Reward Processing)
      • Substance use triggers dopamine release, reinforcing pleasurable behaviors.
      • Over time, the brain associates substance use with intense rewards, increasing dependence.
      • Users experience cravings, leading to compulsive drug-seeking behavior.
    • Withdrawal/Negative Affect Stage (Extended Amygdala – Emotional Distress)
      • When substance use stops, individuals experience withdrawal symptoms like stress, anxiety, and depression.
      • The brain craves relief, pushing individuals toward continued substance use to avoid discomfort.
      • This stage makes quitting extremely difficult, reinforcing addiction.
    • Preoccupation/Anticipation Stage (Prefrontal Cortex – Impulse Control & Cravings)
      • The prefrontal cortex weakens, impairing decision-making and self-control.
      • Cravings dominate thoughts, leading to obsessive focus on substance use.
      • Despite knowing the negative consequences, individuals struggle to quit due to impaired cognitive function.

    This cycle continuously repeats, making addiction a self-reinforcing loop.

    PYQ:

    [2007] Which one of the following parts of the human brain is the regulating center for swallowing and vomiting?

    Options:

    (a) Cerebellum (b) Cerebrum (c) Medulla oblongata (d) Pons

     

  • Sustainable Construction using Mycelium Bricks

    Why in the News?

    A promising eco-friendly alternative gaining attention is mycelium bricks—a biodegradable, lightweight, and fire-resistant material derived from fungal filaments.

    What Are Mycelium Bricks?

    • Mycelium is a network of thin fungal strands called hyphae that function similarly to plant roots.
      • It grows in soil or other substrates, secreting digestive enzymes to break down organic material, providing nutrients to the fungi, plant partners, and other organisms.
    • Mycelium bricks are made by combining sawdust, husk, and fungal spores, which then solidify into a lightweight, insulating material over a few days.
    • They are biodegradable, fire-resistant, and offer thermal insulation, making them a potential green alternative to conventional bricks.

    Advantages of Mycelium Bricks

    • Lower Carbon Footprint: Mycelium bricks don’t require high-temperature kilns, significantly reducing CO₂ emissions.
    • Lightweight: Easier to transport and handle, reducing logistics-related emissions.
    • Good Thermal Insulation: Helps regulate indoor temperatures, reducing energy consumption in buildings.
    • Biodegradability: Mycelium naturally decomposes, making it a zero-waste material.
    • Versatile Applications: Potential use in interior panelling, circuit boards, liquid filters, and sports equipment.

    Challenges Limiting Large-Scale Adoption

    • Lower Load-Bearing Strength: Mycelium composites have a high strength-to-weight ratio, but they are 100 times weaker than concrete.
    • Susceptibility to Moisture:  Mycelium is highly absorbent, making it prone to fungal decay and moisture damage in humid environments.
    • Shorter Lifespan: Unlike conventional bricks, mycelium biodegrades within a few years, raising concerns about long-term durability.

    PYQ:

    [2023] Consider the following statements:

    1.Some mushrooms have medicinal properties.

    2.Some mushrooms have psychoactive properties.

    3.Some mushrooms have insecticidal properties.

    4.Some mushrooms have bioluminescent properties.

    How many of the above statements are correct?

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

     

  • Genetically-Engineered Bananas to Reduce Food Waste

    Why in the News?

    Scientists at Tropic, a UK-based biotech company, disabled the PPO gene in bananas slowing down the browning process while allowing normal ripening.

    About the Genetically Engineered Bananas

    • Genetically engineered bananas are modified using biotechnology to extend shelf life, resist browning, and enhance durability.
    • These bananas stay yellow for 12 hours after peeling and are less prone to bruising.
    • The modification prevents enzymatic browning, making bananas look fresh for longer without altering their ripening process.
    • The modification targets polyphenol oxidase (PPO), the enzyme responsible for browning.
    • By disabling PPO activity, oxidation of pigments is slowed, delaying the formation of brown spots.

    Gene-Silencing Method Used:

    • RNA interference (RNAi) is used to silence the PPO gene, reducing its activity without affecting overall banana development.
    • RNAi introduces small RNA molecules that block PPO gene expression, preventing the synthesis of the browning enzyme.
    • This method is precise and does not introduce foreign DNA, making it different from traditional genetically modified organisms (GMOs).
    • Gene-editing techniques like CRISPR-Cas9 are also being explored for future crop modifications.

    PYQ:

    [2019] ‘RNA interference (RNAi)’ technology has gained popularity in the last few years. Why?

    1. It is used in developing gene silencing therapies.

    2. It can be used in developing therapies for-the treatment of cancer.

    3. It can be used to develop hormone replacement therapies.

    4. It can be used to produce crop plants that are resistant to viral pathogens.

    Select the correct answer using the code given below:

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

     

  • What are Collisionless Shock Waves?

    Why in the News?

    A recent study published by Johns Hopkins University (USA) and Northumbria University (UK) reveals how Collisionless Shock Waves act as cosmic accelerators, helping subatomic particles gain ultra-high energy and travel vast distances in space.

    What are Collisionless Shock Waves?

    • Collisionless shock waves are disturbances in plasma (ionized gas) where energy transfer occurs without direct particle collisions, relying instead on electromagnetic forces.
    • They are found in supernova remnants, black hole disks, pulsars, magnetars, and planetary magnetospheres.
    • They act as natural cosmic accelerators, boosting electrons and other charged particles to ultra-high speeds.

    Key Findings from the Study

    • NASA’s MMS, THEMIS, and ARTEMIS missions observed an electron acceleration event near Earth’s bow shock on December 17, 2017.
    • Electrons in Earth’s foreshock region gained 500 keV of energy, reaching 86% of the speed of light, a huge increase from their usual 1 keV.
    • Diffusive shock acceleration (known for producing high-energy cosmic rays) requires electrons to already be moving at 50% of light speed before further acceleration can occur.
    • The study identifies how electrons receive this initial boost, a long-standing astrophysical mystery.
    • Scientists have long assumed that supernova explosions are the primary source of cosmic rays.
    • The recent study suggests that planetary magnetospheres interacting with stellar winds could also contribute to high-energy cosmic rays.

    How Shock Waves accelerate Particles without Collisions?

    • Unlike in solids, liquids, or gases, where energy is transferred via molecular collisions, plasma particles interact through electromagnetic fields.
    • This allows shock waves to accelerate electrons without direct contact.
    • Multi-Stage Acceleration Process:
      1. Plasma waves interact with electrons, imparting initial energy.
      2. Magnetic turbulence in the shock front causes electrons to spiral, further increasing their speed.
      3. Repeated interactions with plasma waves push electrons to relativistic speeds.
    • Role of Earth’s Bow Shock & Foreshock:
      • When the solar wind collides with Earth’s magnetosphere, it forms a shock wave.
      • The foreshock region ahead of this wave is highly turbulent, enabling efficient electron acceleration.

    PYQ:

    [2009] In the year 2008, which one of the following conducted a complex scientific experiment in which sub-atomic particles were accelerated to nearly the speed of light?

    (a) European Space Agency

    (b) European Organization for Nuclear Research (CERN)

    (c) National Aeronautics and Space Administration (NASA)

    (d) National Academy of Sciences, USA

     

  • ‘AI Kosha’ Platform

    Why in the News?

    The Union Government has launched AI Kosha, a platform dedicated to non-personal datasets, marking a major step in India’s AI research and development efforts.

    What is AI Kosha?

    • AI Kosha is a government-backed platform for non-personal datasets to support Artificial Intelligence (AI) R&D in India.
    • It serves as a centralized repository of structured datasets aimed at training AI models, particularly for Indian languages.
    • The platform is a key part of the IndiaAI Datasets Platform, one of the seven pillars of the ₹10,370 crore IndiaAI Mission, which aims to democratize AI access and innovation.
    • At launch, it hosts 316 datasets, with a significant portion focused on language translation tools for Indian languages.
    • The government has commissioned 14,000 GPUs for AI research, up from 10,000 earlier this year.
    • More computing power will be added quarterly to support advanced AI research and training.

    Key Features of AI Kosha:

    • AI Kosha aims to support India’s first foundational AI model, similar to China’s DeepSeek.
    • Works alongside the Open Governance Data Platform (data.gov.in), which already hosts 12,000 datasets from various government agencies.
    • Focuses on Indian languages, ensuring regional language AI development.
    • Includes health records, satellite imagery, Census 2011 data, meteorological and pollution data.
    • Supports AI development with access to high-performance computing (HPC) resources.
    • Equipped with secure API access, data encryption, and real-time filtering for data protection.