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GS Paper: GS3

  • Project Cheetah

    Why in the News

    Two cheetahs brought from Botswana were released into the wild at Kuno National Park (MP) after completing quarantine and acclimatisation. With this, India’s total cheetah population has increased to 57, including cubs born in India.

    About Project Cheetah

    • Project Cheetah is India’s ambitious wildlife conservation programme aimed at:
      • Reintroducing cheetahs into Indian ecosystems
      • Restoring ecological balance
      • Establishing a viable cheetah population in the wild
    • It is the world’s first intercontinental large carnivore translocation project.

    Launch of the Project

    • The project was launched in September 2022 by Narendra Modi at Kuno National Park

    Background

    • Extinction in India: The Asiatic cheetah became extinct in India in 1952
    • Main reasons: Hunting, Habitat loss, and Decline in prey base
    • India declared the cheetah extinct officially in 1952.

    Source Countries of Cheetahs

    • Namibia: 8 cheetahs brought in September 2022
    • South Africa: 12 cheetahs brought in 2023
    • Botswana: 9 cheetahs brought in 2026
    [2024] Consider the following statements: 
    1. Lions do not have a particular breeding season. 
    2. Unlike most other big cats, cheetahs do not roar. 
    3. Unlike male lions, male leopards do not proclaim their territory by scent marking. 
    Which of the statements given above are correct? 
    [A] 1 and 2 only [B] 2 and 3 only [C] 1 and 3 only [D] 1,2 and 3
  • Prevalence of fake currency till a reality post-demonetisation

    Why in the News?

    Nearly a decade after demonetisation was projected as a major strike against black money and fake currency, new NCRB and Parliamentary data show that counterfeit currency continues to circulate in India. The issue has become significant because fake ₹500 notes have sharply increased, Gujarat alone accounted for more than half of counterfeit currency seizures between 2017 and 2024, and counterfeit ₹2,000 notes rose despite being introduced after demonetisation.

    Why was demonetisation expected to curb fake currency?

    1. Currency Replacement: Demonetisation invalidated old ₹500 and ₹1,000 notes and introduced redesigned currency with enhanced security features.
    2. Financial Disruption: Intended to eliminate counterfeit stock accumulated by criminal and terror networks.
    3. Formalisation of Economy: Encouraged banking transactions and digital payments to reduce cash dependency.
    4. Security Objective: Sought to weaken terror financing channels dependent on fake Indian currency notes (FICN).
    5. Governance Goal: Intended to reduce black money circulation and illicit cash transactions.

    What do recent data reveal about counterfeit currency trends?

    1. Persistent Counterfeit Circulation: NCRB data show counterfeit currency seizures worth more than ₹54.61 crore across States.
    2. Peak Seizures in 2022: Fake currency seizures reached ₹382.6 crore, the highest level in recent years and over 85% linked to Gujarat.
    3. Sharp Rise After Demonetisation: Counterfeit ₹2,000 notes nearly doubled compared to 2017 despite being newly introduced after demonetisation.
    4. Continued Fake ₹500 Notes: Fake ₹500 notes seized in 2024 were nearly four times the level recorded in 2016.
    5. Pandemic Disruption: Currency seizures fell temporarily in 2020 (₹92 crore) during COVID-19 restrictions but later surged.
    6. Banking Detection: Banks detected counterfeit notes worth nearly ₹40.26 crore between 2020-21 and 2024-25, averaging roughly 2 lakh fake notes annually.

    Why does the rise in fake ₹500 and ₹2,000 notes matter?

    1. Security Failure: Indicates criminal networks adapted rapidly even after redesigned currency introduction.
    2. Post-Demonetisation Counterfeiting: Fake ₹2,000 notes, introduced after 2016, emerged in large numbers, questioning technological safeguards.
    3. ₹500 Dominance: Fake ₹500 notes formed a major share of seizures because the denomination remained widely used even after the withdrawal of ₹2,000 notes from circulation in May 2023.
    4. Banking Penetration: Counterfeit notes entering banks indicate that fake currency penetrated formal financial channels
    5. Economic Trust Deficit: Sustained counterfeiting weakens public confidence in cash transactions.

    Why has Gujarat emerged as the major hub of counterfeit currency seizures?

    1. High Seizure Concentration: Gujarat accounted for ₹355.72 crore, more than half of India’s total counterfeit currency seizures (2017-2024).
    2. Geographical Significance: Coastal access and trade routes may increase vulnerabilities to smuggling and organised criminal activity.
    3. Extraordinary Spike in 2022: Gujarat alone contributed to more than 85% of counterfeit currency seized nationally.
    4. Inter-State Pattern: Maharashtra and Karnataka followed Gujarat with seizures worth approximately ₹100 crore and ₹50 crore, respectively.
    5. Enforcement Question: Raises concerns regarding whether high seizures indicate stronger policing or higher counterfeit circulation.

    Has demonetisation achieved its objectives regarding fake currency?

    1. Partial Success: Immediate withdrawal disrupted counterfeit stock based on old ₹500 and ₹1,000 notes.
    2. Limited Long-Term Impact: Rising fake currency in new denominations suggests only temporary gains.
    3. Digitalisation Outcome: India witnessed growth in digital transactions, reducing some dependence on cash.
    4. Black Money Limitation: Cash-based black money adapted through alternative channels.
    5. Institutional Challenge: Persistent counterfeiting suggests the need for continuous currency security upgrades.

    What are the broader economic and security implications of counterfeit currency?

    1. Terror Financing: Fake currency supports unlawful activities and cross-border terror financing.
    2. Inflationary Distortion: Counterfeit money artificially increases cash circulation.
    3. Monetary Credibility: Reduces trust in sovereign currency and payment systems.
    4. Banking Burden: Increases costs of verification and counterfeit detection.
    5. Internal Security Threat: Strengthens organised crime and hawala networks.

    What measures can strengthen India’s anti-counterfeit framework?

    1. Currency Security Enhancement: Ensures frequent upgrades in watermarking, microprinting, and security threads.
    2. AI-Based Detection: Facilitates real-time identification of counterfeit notes in ATMs and banks.
    3. Border Surveillance: Strengthens monitoring of smuggling routes and cross-border criminal networks.
    4. Financial Intelligence Coordination: Supports coordination among RBI, NCRB, FIU-IND, DRI, NIA, and State police.
    5. Digital Payments Expansion: Reduces excessive cash dependence and counterfeit vulnerability.
    6. Public Awareness: Ensures citizen awareness regarding security features of currency notes.

    Conclusion

    The persistence of counterfeit currency despite demonetisation indicates that currency replacement alone cannot eliminate the challenge of fake money. While the 2016 exercise disrupted old counterfeit networks temporarily and accelerated digital transactions, rising seizures of fake new-series notes reveal institutional and technological gaps. A sustained strategy based on advanced currency security features, stronger inter-agency coordination, border vigilance, financial intelligence, and reduced cash dependency is necessary to protect monetary credibility and internal security.

    PYQ Relevance

    [UPSC2022] Give out the major sources of terror funding in India and the efforts being made to curtail these sources. In the light of this, also discuss the aim and objective of the ‘No Money for Terror (NMFT)’ Conference recently held at New Delhi in November 2022.

    Linkage: Counterfeit currency is a major source of terror financing, often linked with hawala, organised crime, and cross-border networks. The article directly relates to illicit financial flows and internal security.

  • Solar Power Curtailment in India 

    Why in the News

    India witnessed record electricity demand in April 2026, yet large amounts of solar power had to be curtailed due to grid stress, transmission bottlenecks, and surplus daytime generation.

    What is Solar Curtailment?

    • Solar curtailment refers to the reduction of electricity generation from solar plants by grid operators to maintain grid stability and prevent overload.
    • Even though renewable energy has “must-run” status in India, it can still be reduced under emergency or technical conditions.

    Record Curtailment

    • April 2026 solar curtailment:
      • 693.81 GWh
    • January to March 2026 combined:
      • 399.34 GWh
    • This means April alone recorded around 74% higher curtailment than the previous three months combined.

    Main Reasons Behind Curtailment

    • Grid Stability Concerns: Rapid increase in solar generation during daytime created excess electricity supply. The grid struggled to absorb this sudden surge.
    • Transmission Constraints: Major solar-producing States like Rajasthan and Gujarat Faced:
      • Transformer overloading
      • Transmission congestion
      • Heavy underdrawal of electricity
    • Demand-Supply Timing Mismatch
      • Daytime: Electricity prices crashed to nearly ₹1.5/unit
      • Night-time: Solar unavailable. Prices rose close to ₹10/unit ceiling
    • This highlights the need for energy storage systems.

    What is Emergency TRAS (Tertiary Reserves Ancillary Services)?

    • It is a mechanism used by the power grid operator to maintain stability during emergency situations.
    • Under Emergency TRAS:
      • Renewable energy plants are instructed to reduce generation temporarily.
      • They receive financial compensation for the lost generation.
    [2025] Consider the following statements about ‘PM Surya Ghar Muft Bijli Yojana’: 
    I. It targets installation of one crore solar rooftop panels in the residential sector. 
    II. The Ministry of New and Renewable Energy aims to impart training on installation, operation, maintenance and repairs of solar rooftop systems at grassroot levels. 
    III. It aims to create more than three lakhs skilled manpower through fresh skilling, and upskilling, under scheme component of capacity building. 
    Which of the statements given above are correct? 
    [A] I and II only [B] I and III only [C] II and III only [D] I, II and III
  • Hypersonic Cruise Missile Scramjet Test 

    Why in the News

    Defence Research and Development Organisation (DRDO) successfully tested the actively cooled scramjet combustor of a new hypersonic cruise missile at the Scramjet Connect Pipe Test facility in Hyderabad.

    Key Achievement

    • DRDO achieved: 1,200 second runtime of the scramjet combustor
    • Previous successful test: 700 plus seconds in January 2026

    About Hypersonic Cruise Missile

    • Missile capable of travelling at:
      • More than Mach 5
      • Over five times the speed of sound
    • Approximate speed:
      • Above 6,100 km per hour

    What is a Scramjet Engine? 

    • Full Form: Supersonic Combustion Ramjet
    • Air breathing engine using:
      • Supersonic airflow during combustion
    • Operates efficiently at hypersonic speeds (Speed:5 Mach) 
    • Uses atmospheric oxygen instead of carrying oxidiser
    • Suitable for:
      • Hypersonic missiles
      • Advanced aerospace systems

    Countries Developing Hypersonic Technology

    • India
    • United States
    • Russia
    • China
    [UPSC 2009] In the context of Indian defence, consider the following statements: 
    1. The Shourya missile flies with a speed of more than 8 Mach. 
    2. The range of Shourya missile is more than 1600 km. 
    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
  • [9th May 2026] The Hindu OpED: A watershed moment in India’s defence posture

    PYQ Relevance[UPSC 2016] The terms ‘Hot Pursuit’ and ‘Surgical Strikes’ are often used in connection with armed action against terrorist attacks. Discuss the strategic impact of such actions.Linkage: Operation Sindoor directly reflects India’s evolving doctrine of calibrated retaliation, cross-border counter-terror operations, and escalation management under a nuclear overhang. The topic links with GS-III microthemes of Internal Security, Border Management, Counter-Terrorism, Defence Preparedness, and Strategic Deterrence.

    Mentor’s Comment

    Operation Sindoor marks a major shift in India’s national security doctrine. The operation reflects the movement from “strategic restraint” to calibrated military retaliation against cross-border terrorism. India reportedly carried out deep, coordinated strikes against terror infrastructure and military assets in Pakistan despite the risks associated with escalation between two nuclear-armed neighbours. It signals the emergence of a new strategic doctrine centred on deterrence, rapid response, military integration, and indigenous defence preparedness.

    How does Operation Sindoor signify a shift from “strategic restraint” to proactive deterrence?

    1. Doctrinal Shift: Replaces India’s earlier “dossier diplomacy” and restrained retaliation approach with direct punitive military action against terror infrastructure.
    2. Zero-Tolerance Policy: Treats cross-border terrorism as an “act of war,” thereby lowering India’s threshold for calibrated retaliation.
    3. Political Resolve: Demonstrates political willingness to undertake high-risk military operations despite nuclear escalation concerns.
    4. Deterrence Signalling: Establishes costs for state-sponsored terrorism through visible and rapid retaliation.
    5. Strategic Messaging: Signals that India will no longer remain constrained by fears of nuclear blackmail.
    6. Pahalgam Trigger: Uses the April 22, 2025 Pahalgam terror attack as the immediate catalyst for doctrinal transformation.

    How did integrated military operations enhance India’s operational effectiveness?

    1. Jointness: Ensures coordinated functioning of the Indian Air Force, Indian Army, and Indian Navy during multi-domain operations.
    2. Air Dominance: Facilitates deep strikes against targets including Nur Khan, Sargodha, Murid, and Bholari.
    3. Naval Deployment: Strengthens maritime deterrence through Indian naval positioning near Karachi.
    4. Drone Neutralisation: Enables interception of Pakistani drone attacks through integrated air-defence systems.
    5. S-400 Deployment: Enhances layered air defence and denies hostile access to Indian airspace.
    6. Escalation Control: Maintains calibrated military pressure while avoiding uncontrolled conflict expansion
    7. Rapid Response Capability: Demonstrates India’s ability to execute simultaneous high-intensity operations across theatres.

    How does the operation reflect evolving escalation management under a nuclear overhang?

    1. Escalation Dominance: Demonstrates India’s ability to impose military costs while controlling conflict intensity.
    2. Calibrated Retaliation: Ensures proportional targeting focused on terror and strategic infrastructure.
    3. Coercive Diplomacy: Pressurises Pakistan into requesting a ceasefire after sustained military setbacks.
    4. Nuclear Threshold Management: Challenges the earlier assumption that nuclear deterrence would prevent conventional retaliation.
    5. Strategic Signalling: Communicates India’s willingness to act despite risks associated with nuclear adversaries.
    6. Termination Timing: Concludes operations after achieving limited strategic objectives, thereby preventing prolonged escalation.
    7. Military Preparedness: Reflects enhanced readiness for high-tempo warfare under complex strategic conditions.

    Why is Operation Sindoor considered a major strategic and psychological signal?

    1. New Normal: Institutionalises rapid punitive retaliation as part of India’s future counter-terror doctrine.
    2. Psychological Deterrence: Increases uncertainty for terrorist groups and their state backers.
    3. Global Signalling: Demonstrates India’s military capability before the international strategic community.
    4. Narrative Shift: Challenges Pakistan’s long-standing use of proxy warfare under nuclear cover.
    5. Domestic Confidence: Reinforces public confidence in India’s military and political leadership.
    6. Transparency Era: Limits information control through digital scrutiny, satellite imagery, and global defence analysis.
    7. Civil-Military Synergy: Highlights coordination between political leadership and military command structures.

    How can Operation Sindoor accelerate indigenous defence reforms and Atmanirbharta?

    1. Defence Industrialisation: Strengthens the need for rapid expansion of indigenous defence manufacturing.
    2. Atmanirbharta: Encourages domestic production under the “Innovate, Design and Manufacture” framework.
    3. Private Sector Participation: Expands the role of MSMEs, startups, and private firms in defence ecosystems.
    4. Technological Innovation: Boosts investments in aerospace, cyber systems, Artificial Intelligence, and drones.
    5. DRDO Integration: Reinforces the role of Defence Research and Development Organisation laboratories in defence modernisation.
    6. Public-Private Collaboration: Enhances integration between Defence Public Sector Undertakings and private industry.
    7. Operational Readiness: Ensures sustained military preparedness through indigenous supply chains.
    8. Innovation Ecosystem: Encourages startup-led military innovation following operational success of indigenous systems.

    What are the broader geopolitical and strategic implications for India?

    1. Regional Deterrence: Strengthens India’s credibility as a decisive regional power.
    2. Counter-Terror Framework: Reframes terrorism as a direct national security threat requiring military response.
    3. Strategic Autonomy: Demonstrates independent decision-making without excessive external dependence.
    4. Military Modernisation: Accelerates reforms relating to theatre commands and integrated warfare.
    5. Global Perception: Positions India as a state willing to defend strategic red lines.
    6. Hybrid Warfare Preparedness: Highlights the growing role of drones, cyber capability, and precision systems.
    7. Civil Defence Awareness: Underlines the importance of societal preparedness during high-intensity conflicts.

    Conclusion

    Operation Sindoor marks a structural evolution in India’s national security doctrine. The operation reflects a transition toward integrated, technology-driven, and deterrence-oriented warfare. It also reinforces the importance of indigenous capability, political resolve, and civil-military coordination in addressing contemporary security threats. The long-term significance of the operation lies in its attempt to redefine strategic thresholds and establish a credible deterrence framework against cross-border terrorism.

  • Cyphostemma annamalaii 

    Why in the News?

    Researchers from Annamalai University discovered a new plant species named Cyphostemma annamalaii in the southern Eastern Ghats of Tamil Nadu.

    About Cyphostemma annamalaii

    • Newly discovered plant species belonging to: Vitaceae (grape family)
    • Found in: Tropical dry forests of the southern Eastern Ghats
    • Habitat:
      • Open scrubby vegetation
      • Dry forest ecosystems

    About the Vitaceae Family

    Vitaceae

    • Commonly known as: Grape family
    • Includes climbing plants and vines
    • Economically important due to grape cultivation

    About Eastern Ghats

    • Discontinuous mountain range along eastern India
    • Passes through:
      • Odisha
      • Andhra Pradesh
      • Telangana
      • Karnataka
      • Tamil Nadu
    • Known for rich biodiversity and endemic species
    [2016] With reference to ‘Red Sanders’, sometimes seen in the news, consider the following statements: 
    1. It is a tree species found in a part of South India. 
    2. It is one of the most important trees in the tropical rainforest areas of South India. 
    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
  • Geocell 

    Why in the News

    CSIR-Central Road Research Institute (CSIR-CRRI) and Bharat Petroleum Corporation Limited (BPCL) were recognised by the India Book of Records and Asia Book of Records for constructing the first roadblock section using technical textile geocell made from end of life plastic.

    About Geocell

    • A three dimensional cellular confinement system used in geotechnical engineering
    • Designed to improve:
      • Soil stability
      • Load bearing capacity
      • Structural reinforcement

    Structure of Geocell

    • Consists of interconnected honeycomb shaped cells
    • Made from geosynthetic materials such as:
      • High Density Polyethylene (HDPE)
      • Polyester

    Working Mechanism

    • Cells are expanded on site to form a mattress like layer
    • Filled with materials such as: Soil, Sand, Aggregate, and Clay
    • After compaction:
      • The geocell integrates with underlying soil
      • Creates a reinforced and stable structure
    [2020] In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint? 
    1. Copper slag 
    2. Cold mix asphalt technology 
    3. Geotextiles Hot mix asphalt technology 
    4. Portland cement 
    Select the correct answer using the code given below: 
    a) 1, 2 and 3 only 
    b) 2, 3 and 4 only 
    c) 4 and 5 only 
    d) 1 and 5 only
  • Tactical Advanced Range Augmentation (TARA) 

    Why in the News

    Defence Research and Development Organisation (DRDO) and the Indian Air Force (IAF) successfully conducted the maiden flight trial of the Tactical Advanced Range Augmentation (TARA) weapon system off the coast of Odisha on May 7, 2026.

    About TARA (Tactical Advanced Range Augmentation)

    • It is India’s first indigenous glide weapon system
    • Purpose: Converts unguided warheads into precision guided weapons

    Developed By

    • Research Centre Imarat (RCI), Hyderabad
    • Along with other DRDO laboratories

    Key Features

    • Glide Weapon System: Uses aerodynamic lift to glide towards targets after launch
    • Enhances:
      • Accuracy
      • Lethality
      • Operational range
    • Low Cost Technology: Utilises state of the art low cost systems
    [2023] Consider the following statements 
    1. Ballistic missiles are jet-propelled at subsonic speeds throughout their fights, while cruise missiles are rocket-powered only in the initial phase of fight. 
    2. Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile. 
    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
  • Oak Trees Delay Leafing to Avoid Caterpillars 

    Why in the News

    A study published in Nature has found that oak trees in temperate forests delay budburst and leaf emergence after heavy caterpillar infestation to reduce insect damage.

    Key Findings of the Study

    • Oak trees delayed spring leaf emergence by about:
      • Three days after severe caterpillar attacks
    • Study conducted across:
      • 60 oak forest sites
      • Over 2,400 km
      • During 2017 to 2021

    What is Budburst

    • Stage when tree buds open and new leaves emerge during spring

    Why Trees Delay Leafing

    • Caterpillars depend on soft fresh leaves immediately after hatching
    • Delayed leaf emergence creates temporary food shortage for insects
    • Result:
      • Reduced caterpillar survival
      • Lower leaf damage

    Major Outcomes

    • Leaf damage reduced by nearly: 55%
    • Delayed leafing found more energy efficient than chemical defence mechanisms
    [2022] If you travel through the Himalayas, you are likely to see which of the following plants naturally growing there? 
    1. Oak 
    2. Rhododendron 
    3. Sandal wood 
    Select the correct answer using the code given below: 
    a) 1 and 2 only b) 3 only c) 1 and 3 only d) 1, 2 and 3
  • Cyborg Materials and Learning Metamaterials 

    Why in the News

    Researchers in Europe have developed a synthetic metamaterial capable of physically learning and changing shape in response to external conditions. The findings were published in the journal Nature Physics.

    About Metamaterials

    • Special engineered materials whose properties depend on:
      • Internal structure
      • Physical arrangement
      • Not just chemical composition
    • Can exhibit unusual properties not found in natural materials

    Key Features of the New Material

    • Built as a chain of connected robotic units
    • Each unit contains:
      • Motor
      • Angle sensor
      • Microcontroller
    • Capable of:
      • Learning shapes
      • Forgetting previous configurations
      • Adapting to new external conditions
    [2023] Consider the following actions: 
    1. Detection of car crash/collision which results in the deployment of airbags almost instantaneously
     2. Detection of accidental free fall of a laptop towards the ground which results in the immediate turning off of the hard drive 
    3. Detection of the tilt of the smart- phone which results in the rotation of display between portrait and landscape mode 
    In how many of the above actions is the function of accelerometer required? 
    [A] Only one [B] Only two [C] All three [D] None