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GS Paper: GS3

  • Saltwater Crocodile Population Survey in Sundarbans

    Why in the News?

    A 2025 survey by the West Bengal Forest Department shows an increase in saltwater crocodile population in the Sundarbans Biosphere Reserve (SBR).

    Saltwater Crocodile Population Survey in Sundarbans

    About Saltwater Crocodile (Crocodylus porosus):

    • Largest living reptile and the largest of all crocodilians.
    • Males grow much larger than females; females usually 2.5–3 m in length.
    • Habitat: mangrove forests, swamps, rivers, and coastal waters; tolerant of varying salinity.
    • Distribution in India: Odisha, West Bengal (Sundarbans), Andaman & Nicobar Islands.
    • Behaviour: Apex predator, feeds on carcasses and diverse prey; communicates through barks, hisses, growls, chirps.
    • Conservation Status:
      • IUCN Red List: Least Concern.
      • CITES: Appendix I (except populations of Australia, Indonesia, PNG → Appendix II).
      • Wildlife Protection Act (1972): Schedule I.
    • Conservation Efforts: Bhagabatpur Crocodile Project (1976, West Bengal) – breeding and conservation programme; 577 crocodiles released till 2022.

    Other Crocodile Species in India:

    • Gharial: Critically Endangered; survives in only 2% of former range; Found in small stretches of Chambal and a few other rivers.
    • Mugger/Marsh Crocodile: Vulnerable; found in freshwater lakes, rivers, marshes.

  • How does plastic pollution affect health?

    Introduction

    Plastic pollution represents one of the gravest environmental crises of our times. Despite decades of regulation and bans, plastics remain ubiquitous, cheap, and nearly indestructible. Talks in Geneva involving 180 countries failed to secure an internationally binding legal agreement to limit plastic pollution, reflecting deep divisions over whether the treaty should target waste alone or include production.

    Global Plastic Treaty Deadlock: Why It Matters

    • Global deadlock: 180 countries failed to agree on a binding treaty on plastic pollution in Geneva, despite a UNEP-backed resolution already in place.
    • First-time sharp focus on health: Unlike earlier discussions centred only on waste management, the health impact of plastics is now central.
    • Scale of problem: Plastics contain more than 16,000 chemicals, with little knowledge on 10,000+ of them. A Nature study showed 4,000 chemicals of concern are present across major plastic types.
    • Striking evidence: Microplastics detected in blood, breast milk, placenta, bone marrow, bringing urgency to the debate.

    The Persistence and Ubiquity of Plastics

    1. Symbol of consumption economy: Cheap and versatile, plastics reflect today’s global consumption.
    2. Persistence and flexibility: Synthetic, fossil-fuel-derived polymers are non-biodegradable and endure for decades.
    3. Waste mismanagement: Cheap production, ubiquity, and limited recycling capacity turn plastics into the prime source of litter.

    Plastics and Human Health: Emerging Evidence

    1. Chemicals of concern: Plastics use ethylene, propylene, styrene derivatives, along with bisphenols, phthalates, PCBs, PBDEs, and PFAS.
    2. Products of exposure: Found in food containers, bottles, teething toys, polyester, IV bags, cosmetics, paints, electronics, adhesives.
    3. Health links: Studies link plastic chemicals to thyroid dysfunction, hypertension, kidney/testicular cancer, gestational diabetes.
    4. Evidence base: Around 1,100 studies, involving 1.1 million individuals, compiled by Boston College & Minderoo Foundation dashboard.
    5. Nature of studies: Mostly associative; longitudinal studies (gold standard) are still underway.

    The Microplastic Menace

    1. Definition: Plastics smaller than 5 mm, found in additives or broken-down products.
    2. Recent discoveries: Detected in human blood, breast milk, placenta, bone marrow.
    3. Health uncertainty: Exact impacts still under study, but linked to multiple disorders.

    Policy Responses: Global and Indian Perspectives

    • Global scene: Negotiations divided on waste vs production; developing countries demand funding support.
    • India’s stance: 
      • Ban on single-use plastics in ~20 States
      • Administrative push for Extended Producer Responsibility (EPR)
      • Views plastics as a waste management issue, not a health issue.
      • Prefers health dimension to be dealt with at WHO, not in the plastics treaty.

    Conclusion

    The Geneva deadlock reflects not just a failure of diplomacy but the widening gap between scientific evidence and policy action. Plastics are no longer an invisible convenience; they are a pervasive health hazard. While India treats plastics as a waste issue, ignoring health risks leaves a blind spot in policy. A robust, binding treaty addressing both production and health impact is indispensable if the world is to prevent plastics from becoming the new tobacco of the 21st century.

    PYQ Relavance

    [UPSC 2023] What is oil pollution? What are its impacts on the marine ecosystem? In what way is oil pollution particularly harmful for a country like India?

    Linkage: Since UPSC has already asked about oil pollution (2023), it shows the exam’s focus on pollution and ecosystem impacts. Plastic pollution, like oil, originates from fossil fuels and has severe effects on marine life and human health. Hence, a direct question on plastic pollution and its health–environment nexus is highly probable.

    Practice Mains Question

    Plastics are no longer merely a waste management problem but a serious health hazard. Critically examine the health risks associated with plastic use and evaluate India’s stance in global plastic treaty negotiations.

    Mapping Microthemes

    • GS-1: Impact of industrialisation and consumerism on environment.
    • GS-2: International negotiations, India’s foreign policy stance in environmental treaties.
    • GS-3: Pollution, waste management, health-environment nexus.
    • GS-4: Ethics of sustainability, intergenerational justice, corporate responsibility.

  • Is the new Income Tax law more accessible? 

    Introduction

    In August 2025, Parliament passed the Income Tax Bill, 2025, a shorter and simplified legislation with 23 chapters (down from 47) and 536 sections (down from 819). The Bill aims to reduce discretion with clearer provisions, introduce taxpayer-friendly reforms like longer timelines for return updation, and curb harassment. However, it has also expanded the powers of tax officials, especially over digital information and personal data, raising concerns about privacy and misuse.

    Need for Overhauling the 1961 Income Tax Framework

    1. Obsolete framework: The Income Tax Act, 1961 had become outdated, riddled with amendments, and difficult for laypersons to interpret.
    2. Harassment potential: Excessive discretion allowed officials to harass taxpayers.
    3. Structural reform: New law cuts down chapters from 47 to 23 and sections from 819 to 536, simplifying compliance.
    4. Greater clarity: More tables (57, up from 18) and formulae (46, up from 6), along with examples to aid understanding.

    From Draft Bill to Final Law: The Legislative Journey

    1. Initial draft (Feb 2025): Introduced in Parliament but referred to a Select Committee given the Bill’s significance.
    2. Committee review: Headed by Baijayant Panda, with MPs across parties; submitted a detailed report in July 2025.
    3. Withdrawal & replacement: Government withdrew the earlier version on August 8, 2025, to incorporate committee recommendations.
    4. Final Bill (Aug 11, 2025): Introduced and passed the same day, avoiding confusion through multiple versions.

    Key Reforms and Structural Simplifications:

    1. No slab changes: Finance Minister clarified tax rates and slabs remain unchanged.
    2. Technical refinements: Clearer provisions for Minimum Alternate Tax (MAT) and Alternate Minimum Tax (AMT), separated into sub-sections.
    3. Taxpayer-friendly features: Returns can be updated up to 4 years from the end of the relevant assessment year without penalty; Assessment reopening period reduced to 5 years.

    Simplification Gains and Emerging Concerns

    1. Expanded search powers: Tax officers can now demand passwords of electronic devices, emails, and social media accounts.
    2. Override access: Officials may bypass access codes to computer systems if passwords are not shared.
    3. Privacy concerns: Unlike earlier provisions (limited to inspection and lock-breaking), the new law extends to personal digital data, raising red flags.

    Government’s Rationale for Expanding Digital Powers

    1. Rationale: Much of financial data today is exchanged via messaging apps, emails, or stored digitally.
    2. Committee stance: Though some dissent was recorded, the Select Committee accepted the government’s view that these provisions are essential for effective investigation.

    Conclusion

    The Income Tax Bill, 2025 is a watershed reform, simplifying one of India’s most complex laws. While the codification of taxpayer-friendly provisions marks a progressive step, the enhanced surveillance powers granted to tax authorities highlight the thin line between efficiency and overreach. The challenge ahead lies in ensuring that simplification does not come at the cost of citizens’ trust and constitutional rights.

    Value Addition for UPSC
    • Governance angle (GS-II): Balancing simplification of laws with citizen rights and privacy.
    • Economic reforms (GS-III): Tax rationalisation improves compliance and ease of doing business.
    • Ethics (GS-IV): Dilemma of state surveillance vs. individual liberty; Kantian duty-based ethics vs. utilitarian approach.
    • Comparative context: Similar debates exist globallye.g., U.S. IRS’s digital access powers vs. EU’s stricter GDPR protections.

    PYQ Relevance

    [UPSC 2020] Explain the rationale behind the Goods and Services Tax (Compensation to States) Act of 2017.How has COVID-19 impacted the GST compensation fund and created new federal tensions?

    Linkage: The GST Compensation Act, 2017 aimed to build Centre–State trust during the GST transition but COVID-19 strained revenues, sparking federal tensions. Similarly, the Income Tax Bill, 2025 seeks to simplify direct taxes to build citizen trust but raises concerns over state overreach in digital surveillance. Both show that taxation is ultimately about trust and legitimacy in governance.

    Practice Mains Question

    The Income Tax Bill, 2025 seeks to simplify India’s tax regime but also introduces stronger surveillance powers for officials. Discuss the balance between efficiency, transparency, and taxpayer rights. (250 words)

    Mapping Microthemes for GS Papers

    1. GS-I: Evolution of economic policies post-Independence.
    2. GS-II: Governance, legislative reforms, fundamental rights (privacy).
    3. GS-III: Fiscal reforms, tax policy, ease of doing business.
    4. GS-IV: Ethics of surveillance, transparency, accountability.

  • 23% of PM Jan Dhan accounts inoperative

    Why in the news?

    The Government informed Parliament that 23% of the 56.04 crore PM Jan Dhan Yojana accounts are inoperative.

    About Pradhan Mantri Jan Dhan Yojana (PMJDY):

    • Launch: Introduced in 2014 as the world’s largest financial inclusion mission.
    • Objective: To provide banking to the unbanked, insurance to the unsecured, and credit to the unfunded.
    • Accounts: Basic Savings Bank Deposit (BSBD) accounts with zero balance, minimal paperwork, and e-KYC facility.
    • Benefits: RuPay debit card with accident insurance, overdraft, micro-insurance, and pension coverage.

    Key Features:

    • Access: Universal banking through branches and Business Correspondents.
    • Overdraft: Up to â‚č10,000 for eligible account holders.
    • Insurance: Accident cover of â‚č1 lakh (â‚č2 lakh for new accounts post-2018); life cover of â‚č30,000 for accounts opened between August 2014–January 2015.
    • Interoperability: Enabled via RuPay cards and Aadhaar-linked platforms.
    • Post-2018 Expansion: Coverage extended to all unbanked adults, overdraft limit enhanced, and eligibility age increased from 60 to 65 years.
    • Direct Benefit Transfers: Strengthened subsidy delivery through the JAM Trinity (Jan Dhan–Aadhaar–Mobile).

    Do you know?

    As per the Reserve Bank of India (RBI) guidelines (2009), an account is considered dormant if no transaction occurs for over two years.

     

    [UPSC 2015] Pradhan Mantri Jan-Dhan Yojana’ has been launched for

    Options:

    (a) providing housing loan to poor people at cheaper interest rates

    (b) promoting women’s Self-Help Groups in backward areas

    (c) promoting financial inclusion in the country*

    (d) providing financial help to the marginalized communities

     

  • How are Soaps and Detergents manufactured?

    Why in the News?

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

    About Soap:

    • Composition: Soap is sodium (Na) or potassium (K) salt of fatty acids derived from vegetable oils or animal fats.
    • Formula: Solid soaps are RCOONa, liquid soaps are RCOOK.
    • Function: Cleansing agent due to dual hydrophilic (water-attracting) and hydrophobic (oil-attracting) nature.
    • History: Used since 2800 BC in Mesopotamia and ancient India (soap nuts, bark, flowers). Became mass-produced during the Industrial Revolution, initially a luxury.

    Soap-Making Process

    • Raw Materials: Oils such as coconut, olive, palm, sunflower provide triglycerides.
    • Hydrolysis: Oils hydrolysed with hot water under pressure → fatty acids + glycerin.
    • Saponification: Fatty acids react with sodium hydroxide (NaOH) → soap (RCOONa) + water.
    • Processing: Soap dried into noodles, blended with perfumes, colours, fillers, additives.
    • Shaping: Extruded, cut, and stamped into bars.
    • Quality: Total Fatty Matter (TFM) indicates quality; higher TFM = better cleansing.
    • Production Scale: Modern automated lines make 600–700 soaps per minute.

    Ecological Impact of Soap

    • Biodegradability: Traditional soaps are biodegradable and safer for the environment.
    • Detergents: Synthetic alternatives developed during World War I oil shortages; more efficient but harmful.
    • Pollution: Surfactants and phosphates in detergents cause nutrient pollution and persist in ecosystems.
    [UPSC 2002] Consider the following statements:

    Assertion (A) Synthetic detergents can lather well in hard water.

    Reason (R): Synthetic detergents form soluble calcium and magnesium salts with hard water.

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

    Options:

    (a) Both A and R are individually true and R is the correct explanation of A *

    (b) Both A and R are individually true but R is not a correct explanation of A

    (c) A is true but R is false

    (d) A is false but R is true

     

  • Primary Amoebic Meningoencephalitis (PAM)

    Why in the News?

    Kerala’s health department has issued an alert in Kozhikode district after three consecutive cases of the rare and highly fatal disease Primary Amoebic Meningoencephalitis (PAM) were reported.

    About Primary Amoebic Meningoencephalitis (PAM):

    • Cause: Rare and usually fatal infection caused by Naegleria fowleri, known as the “brain-eating amoeba.”
    • Habitat: Thrives in warm freshwater up to 46°C (115°F).
    • Entry: Enters through the nose during swimming or water activities, travels via olfactory nerve to the brain.
    • Impact: Destroys brain tissue and causes severe swelling.
    • Transmission: Not communicable from person to person.
    • Symptoms: Headache, fever, nausea, vomiting, stiff neck, confusion, seizures, hallucinations, coma, and death.
    • Progression: According to the Centers for Disease Control and Prevention (CDC), most cases result in death within 1–18 days of symptom onset.

    Diagnosis and Treatment:

    • Diagnosis:
    • Treatment:
      • No single therapy effectively established.
      • Managed per CDC guidelines using drug combinations such as: Medical interventions typically involve a combination of drugs, including amphotericin B, azithromycin, fluconazole, rifampin, miltefosine, and dexamethasone.
    [UPSC 2008] Consider the following statements:

    1. Femur is the longest bone in the human body.

    2. Cholera is a disease caused by bacteria.

    3. ‘Athlete’s foot’ is a disease caused by virus. Which of the statements given above are correct?

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

     

  • Is the new Income Tax law more accessible? 

    Introduction

    In August 2025, Parliament passed the Income Tax Bill, 2025, a shorter and simplified legislation with 23 chapters (down from 47) and 536 sections (down from 819). The Bill aims to reduce discretion with clearer provisions, introduce taxpayer-friendly reforms like longer timelines for return updation, and curb harassment. However, it has also expanded the powers of tax officials, especially over digital information and personal data, raising concerns about privacy and misuse.

    Need for Overhauling the 1961 Income Tax Framework

    1. Obsolete framework: The Income Tax Act, 1961 had become outdated, riddled with amendments, and difficult for laypersons to interpret.
    2. Harassment potential: Excessive discretion allowed officials to harass taxpayers.
    3. Structural reform: New law cuts down chapters from 47 to 23 and sections from 819 to 536, simplifying compliance.
    4. Greater clarity: More tables (57, up from 18) and formulae (46, up from 6), along with examples to aid understanding.

    From Draft Bill to Final Law: The Legislative Journey

    1. Initial draft (Feb 2025): Introduced in Parliament but referred to a Select Committee given the Bill’s significance.
    2. Committee review: Headed by Baijayant Panda, with MPs across parties; submitted a detailed report in July 2025.
    3. Withdrawal & replacement: Government withdrew the earlier version on August 8, 2025, to incorporate committee recommendations.
    4. Final Bill (Aug 11, 2025): Introduced and passed the same day, avoiding confusion through multiple versions.

    Key Reforms and Structural Simplifications:

    1. No slab changes: Finance Minister clarified tax rates and slabs remain unchanged.
    2. Technical refinements: Clearer provisions for Minimum Alternate Tax (MAT) and Alternate Minimum Tax (AMT), separated into sub-sections.
    3. Taxpayer-friendly features: Returns can be updated up to 4 years from the end of the relevant assessment year without penalty; Assessment reopening period reduced to 5 years.

    Simplification Gains and Emerging Concerns

    1. Expanded search powers: Tax officers can now demand passwords of electronic devices, emails, and social media accounts.
    2. Override access: Officials may bypass access codes to computer systems if passwords are not shared.
    3. Privacy concerns: Unlike earlier provisions (limited to inspection and lock-breaking), the new law extends to personal digital data, raising red flags.

    Government’s Rationale for Expanding Digital Powers

    1. Rationale: Much of financial data today is exchanged via messaging apps, emails, or stored digitally.
    2. Committee stance: Though some dissent was recorded, the Select Committee accepted the government’s view that these provisions are essential for effective investigation.

    Conclusion

    The Income Tax Bill, 2025 is a watershed reform, simplifying one of India’s most complex laws. While the codification of taxpayer-friendly provisions marks a progressive step, the enhanced surveillance powers granted to tax authorities highlight the thin line between efficiency and overreach. The challenge ahead lies in ensuring that simplification does not come at the cost of citizens’ trust and constitutional rights.

    Value Addition for UPSC
    • Governance angle (GS-II): Balancing simplification of laws with citizen rights and privacy.
    • Economic reforms (GS-III): Tax rationalisation improves compliance and ease of doing business.
    • Ethics (GS-IV): Dilemma of state surveillance vs. individual liberty; Kantian duty-based ethics vs. utilitarian approach.
    • Comparative context: Similar debates exist globallye.g., U.S. IRS’s digital access powers vs. EU’s stricter GDPR protections.

    PYQ Relevance

    [UPSC 2020] Explain the rationale behind the Goods and Services Tax (Compensation to States) Act of 2017.How has COVID-19 impacted the GST compensation fund and created new federal tensions?

    Linkage: The GST Compensation Act, 2017 aimed to build Centre–State trust during the GST transition but COVID-19 strained revenues, sparking federal tensions. Similarly, the Income Tax Bill, 2025 seeks to simplify direct taxes to build citizen trust but raises concerns over state overreach in digital surveillance. Both show that taxation is ultimately about trust and legitimacy in governance.

    Practice Mains Question

    The Income Tax Bill, 2025 seeks to simplify India’s tax regime but also introduces stronger surveillance powers for officials. Discuss the balance between efficiency, transparency, and taxpayer rights. (250 words)

    Mapping Microthemes for GS Papers

    1. GS-I: Evolution of economic policies post-Independence.
    2. GS-II: Governance, legislative reforms, fundamental rights (privacy).
    3. GS-III: Fiscal reforms, tax policy, ease of doing business.
    4. GS-IV: Ethics of surveillance, transparency, accountability.

  • How does plastic pollution affect health?

    Introduction

    Plastic pollution represents one of the gravest environmental crises of our times. Despite decades of regulation and bans, plastics remain ubiquitous, cheap, and nearly indestructible. Talks in Geneva involving 180 countries failed to secure an internationally binding legal agreement to limit plastic pollution, reflecting deep divisions over whether the treaty should target waste alone or include production.

    Global Plastic Treaty Deadlock: Why It Matters

    • Global deadlock: 180 countries failed to agree on a binding treaty on plastic pollution in Geneva, despite a UNEP-backed resolution already in place.
    • First-time sharp focus on health: Unlike earlier discussions centred only on waste management, the health impact of plastics is now central.
    • Scale of problem: Plastics contain more than 16,000 chemicals, with little knowledge on 10,000+ of them. A Nature study showed 4,000 chemicals of concern are present across major plastic types.
    • Striking evidence: Microplastics detected in blood, breast milk, placenta, bone marrow, bringing urgency to the debate.

    The Persistence and Ubiquity of Plastics

    1. Symbol of consumption economy: Cheap and versatile, plastics reflect today’s global consumption.
    2. Persistence and flexibility: Synthetic, fossil-fuel-derived polymers are non-biodegradable and endure for decades.
    3. Waste mismanagement: Cheap production, ubiquity, and limited recycling capacity turn plastics into the prime source of litter.

    Plastics and Human Health: Emerging Evidence

    1. Chemicals of concern: Plastics use ethylene, propylene, styrene derivatives, along with bisphenols, phthalates, PCBs, PBDEs, and PFAS.
    2. Products of exposure: Found in food containers, bottles, teething toys, polyester, IV bags, cosmetics, paints, electronics, adhesives.
    3. Health links: Studies link plastic chemicals to thyroid dysfunction, hypertension, kidney/testicular cancer, gestational diabetes.
    4. Evidence base: Around 1,100 studies, involving 1.1 million individuals, compiled by Boston College & Minderoo Foundation dashboard.
    5. Nature of studies: Mostly associative; longitudinal studies (gold standard) are still underway.

    The Microplastic Menace

    1. Definition: Plastics smaller than 5 mm, found in additives or broken-down products.
    2. Recent discoveries: Detected in human blood, breast milk, placenta, bone marrow.
    3. Health uncertainty: Exact impacts still under study, but linked to multiple disorders.

    Policy Responses: Global and Indian Perspectives

    • Global scene: Negotiations divided on waste vs production; developing countries demand funding support.
    • India’s stance: 
      • Ban on single-use plastics in ~20 States
      • Administrative push for Extended Producer Responsibility (EPR)
      • Views plastics as a waste management issue, not a health issue.
      • Prefers health dimension to be dealt with at WHO, not in the plastics treaty.

    Conclusion

    The Geneva deadlock reflects not just a failure of diplomacy but the widening gap between scientific evidence and policy action. Plastics are no longer an invisible convenience; they are a pervasive health hazard. While India treats plastics as a waste issue, ignoring health risks leaves a blind spot in policy. A robust, binding treaty addressing both production and health impact is indispensable if the world is to prevent plastics from becoming the new tobacco of the 21st century.

    PYQ Relavance

    [UPSC 2023] What is oil pollution? What are its impacts on the marine ecosystem? In what way is oil pollution particularly harmful for a country like India?

    Linkage: Since UPSC has already asked about oil pollution (2023), it shows the exam’s focus on pollution and ecosystem impacts. Plastic pollution, like oil, originates from fossil fuels and has severe effects on marine life and human health. Hence, a direct question on plastic pollution and its health–environment nexus is highly probable.

    Practice Mains Question

    Plastics are no longer merely a waste management problem but a serious health hazard. Critically examine the health risks associated with plastic use and evaluate India’s stance in global plastic treaty negotiations.

    Mapping Microthemes

    • GS-1: Impact of industrialisation and consumerism on environment.
    • GS-2: International negotiations, India’s foreign policy stance in environmental treaties.
    • GS-3: Pollution, waste management, health-environment nexus.
    • GS-4: Ethics of sustainability, intergenerational justice, corporate responsibility.

  • New Palm Species ‘Phoenix roxburghii’ discovered

    Why in the News?

    A palm specie ‘Phoenix roxburghii’ first described in the 17th-century botanical treatise Hortus Malabaricus has been recently confirmed.

    About Phoenix roxburghii:

    • Origin: Named after William Roxburgh, regarded as the father of Indian Botany.
    • Distribution: Found along India’s eastern coast, Bangladesh, Gujarat, Rajasthan, and Pakistan.
    • Height: Grows up to 12–16 metres, taller than Phoenix sylvestris.
    • Distinct Features:
      • Solitary trunk
      • Larger leaves and leaflets
      • Musty-scented staminate flowers
      • Large, obovoid orange-yellow fruits

    Back2Basics: India’s Oil Palm Scenario

    • National Mission on Edible Oils – Oil Palm (NMEO-OP) (2021): Centrally sponsored, aims to boost domestic crude palm oil (CPO) production and reduce import dependence.
    • Targets:
      • Expand area to 10 lakh ha by 2025–26.
      • Raise production from 0.27 lakh tonnes (2019–20) to 11.2 lakh tonnes (2025–26), further to 28 lakh tonnes (2029–30).
    • Support Mechanisms: Viability Price (VP), Direct Benefit Transfer (DBT), planting subsidy (â‚č29,000/ha), and special aid for NE & Andaman regions.
    • Cultivation States: Andhra Pradesh, Telangana, and Kerala (98% of output); others include Karnataka, Tamil Nadu, Odisha, Gujarat, and NE states.
    • Potential vs Current: 28 lakh ha potential; only 3.7 lakh ha cultivated.
    • Imports: India is the world’s largest palm oil importer (9.2 million tonnes in 2023–24). Palm oil forms 60% of edible oil imports, sourced mainly from Indonesia, Malaysia, and Thailand.
    • Unique Advantage: Palm oil yields are 5× higher than traditional oilseeds.
    [UPSC 2021] With reference to ‘palm oil,’ consider the following statements:

    1. The palm oil tree is native to Southeast Asia.

    2. Palm oil is a raw material for some industries producing lipstick and perfumes.

    3. Palm oil can be used to produce biodiesel.

    Which of the statements given above are correct?

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

     

  • Scientists turn E. Coli Bacteria into a Bio-Sensor

    Why in the News?

    Researchers from UK and China have developed a bioelectronic device where genetically engineered E. Coli bacteria act as self-powered chemical bio-sensor.

    About Escherichia coli (E. coli) Bacteria:

    • Overview: Gram-negative, rod-shaped bacterium that inhabits the lower intestine of warm-blooded animals.
    • Family: Belongs to the Enterobacteriaceae family.
    • Harmless vs Pathogenic: Most strains are harmless, but some (e.g., E. coli O157:H7) cause severe foodborne illness, diarrhoea, and kidney complications.
    • Gut Role: Contributes to vitamin K₂ synthesis and maintains gut microbiota balance.
    • Transmission: Pathogenic strains spread via contaminated food, water, or direct contact, leading to outbreaks.
    • Diagnostic Importance: Presence in water is a key indicator of faecal contamination.

    Bio-Sensors Generated Using E. coli

    • Innovation: Genetically engineered E. coli used as self-powered chemical biosensors.
    • Mechanism: Detect compounds, process signals, and produce electrical outputs compatible with low-cost electronics.
    • Modules:
      • Sensing Module: Detects target molecules.
      • Processing Module: Amplifies or modifies signals.
      • Output Module: Produces phenazines measurable via electrochemistry.
    • Applications:
      • Detected arabinose (plant sugar) within 2 hours.
      • Detected mercury ions in water at trace levels (below WHO safety limits) within 3 hours.
      • Demonstrated an “AND” logic gate, producing signals only when two molecules were present together.
    • Significance:
      • Cheaper, programmable, and robust alternative to enzyme-based biosensors.
      • Potential in environmental monitoring, water safety, medical diagnostics, and bioelectronics.
    [UPSC 2010] Which bacterial strain, developed from natural isolated by genetic manipulations, can be used for treating oil spills?

    (a) Agrodbacterium

    (b) Clostridium

    (c) Nitrosomonas

    (d) Pseudomonas*