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Subject: Science and Technology

  • IISc develops Nanozyme to prevent Abnormal Blood Clotting

    Why in the News?

    Researchers at the Indian Institute of Science (IISc) have created an artificial metal-based nanozyme that can help prevent dangerous blood clotting, especially in conditions like pulmonary thromboembolism (PTE) and COVID-19.

    What is Blood Clotting?

    • About: When we get a cut or injury, our body quickly stops the bleeding by forming a blood clot. This is done by special blood cells called platelets that stick together and seal the wound.
    • Control mechanism: This natural process is called blood clotting or haemostasis and is controlled by certain chemicals in our body like collagen and thrombin.
    • Post covid issues: But in some illnesses like pulmonary thromboembolism (PTE) or COVID-19, the body sends too many signals to make clots, even when there is no injury.
    • Oxidative Stress: This creates a problem called oxidative stress, where harmful molecules called Reactive Oxygen Species (ROS) build up in the blood. These ROS molecules over-activate the platelets, causing them to make too many clots inside blood vessels.
    • Hazards: This can block blood flow, leading to serious health issues like heart attacks, strokes, or lung problems. This condition is called thrombosis, and it can be life-threatening.

    Vanadium-Based Nanozyme and Its Features:

    • Purpose and Design: Scientists at IISc developed vanadium-based nanozymes to mimic natural antioxidant enzymes that reduce ROS levels.
    • How they work: The nanozymes control oxidative stress by copying glutathione peroxidase, an enzyme that removes ROS and protects platelets.
    • Optimal Structure: Spherical-shaped vanadium pentoxide (V₂O₅) nanozymes were found to be the most effective.
    • Test Results in Mice: These nanozymes reduced blood clots and improved survival in PTE-affected mice with no toxicity signs over five days.
    • Next Steps: Scientists plan to test the nanozyme in ischemic stroke and are optimistic about human clinical trials after promising lab results with human platelets.
    [UPSC 2015] With reference to the use of nano-technology in health sector, consider the following statements:

    1. Targeted drug delivery is made possible by nanotechnology.

    2. Nanotechnology can largely contribute to gene therapy.

    Which of the statements given above is/are correct?

    Options: (a) 1 only  (b) 2 only (c) Both 1 and 2* (d) Neither 1 nor 2

     

  • Thermophilic Bacteria in Rajgir Hot Spring could help fight Deadly Infections

    Why in the News?

    Researchers from the Vellore Institute of Technology (VIT) have discovered antibiotic-producing bacteria in the Rajgir hot spring in Nalanda, Bihar.

    What are Thermophilic Bacteria?

    • About: Thermophilic bacteria, or thermophiles (meaning “heat lovers”), are microorganisms that thrive in high-temperature environments ranging from 45°C to 70°C.
    • Adaptation: These temperatures can cause third-degree burns in humans, but thermophiles are biologically adapted to survive and grow in such conditions.
    • Habitats: They are commonly found in hot springs, deep-sea hydrothermal vents, and compost piles, which are mineral-rich and have low microbial competition.
    • Advantages: Some thermophiles produce potent antibiotics to outcompete other microbes and dominate their niche.
    • Global Example: Thermophiles from hot springs in Saudi Arabia have shown antibacterial activity against gram-positive pathogens.

    Key Findings from India:

    • Sampling Challenge: Samples were collected from water and soil at 43°C–45°C, making fieldwork difficult.
    • Microbial Analysis: In the sample, Actinobacteria made up 40–43% of the microbial population, double the typical amount in hot springs.
    • Significance: Actinobacteria are well known for producing key antibiotics like streptomycin and tetracycline.
    • AMR Context: The findings are crucial in the fight against antimicrobial resistance (AMR), which could cost $1 trillion globally by 2050, according to the WHO.
    • Antibiotic Potential:
      • Lab Testing: Seven Actinobacteria strains were found to inhibit pathogens such as E. coli, Salmonella, Klebsiella, Pseudomonas, and Staphylococcus aureus.
      • Compound Discovery: Scientists identified diethyl phthalate using GC-MS, which showed effectiveness against Listeria monocytogenes, a deadly foodborne pathogen.
      • Future Scope: The compound has potential for antibiotic development, but not all thermophiles produce antibiotics, so screening is essential.
    • Uses:
      • Industrial Use: The enzyme Taq polymerase, used in PCR tests (including during COVID-19), is derived from a thermophile called Thermus aquaticus.
      • Agricultural Use: A 2018 BHU study showed thermophiles from Chumathang hot springs (Leh) promote plant growth, revealing wider industrial and ecological value.
    [UPSC 2023] Consider the following statements:

    1. Some microorganisms can grow in environments with temperature above the boiling point of water.

    2. Some microorganisms can grow in environments with temperature below the freezing point of water.

    3. Some microorganisms can grow in highly acidic environment with a pH below 3. How many of the above statements are correct?

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

     

  • ‘Bharat Gen’ AI-based multimodal LLM for Indian languages launched

    Why in the News?

    Union Minister of State for Science & Technology has launched ‘Bharat Gen’, India’s first indigenously developed AI-based Large Language Model (LLM) tailored for Indian languages.

    About Bharat Gen:

    • What is it: Bharat Gen is India’s first homegrown AI-based multimodal large language model (LLM) supporting 22 Indian languages.
    • Developed By: Created under the National Mission on Interdisciplinary Cyber-Physical Systems (NM-ICPS) and implemented by the TIH Foundation for IoT and IoE at IIT Bombay.
    • Key Features:
      • Understands text, speech, and image inputs.
      • Works across India’s diverse languages and cultures.
      • Designed to be ethical, inclusive, and culturally rooted.
    • Support and Collaboration: Backed by the Department of Science and Technology (DST) and developed in collaboration with top academic and AI institutions.
    • Bharat Data Sagar: A national effort to collect language data for lesser-known Indian languages to train future AI tools.
    • Real-World Use: In places like Udhampur, an AI doctor powered by Bharat Gen is helping patients in their native language.

    What are Large Language Models (LLMs)?

    • Large Language Models (LLMs) are advanced AI systems trained on massive amounts of text data to understand and generate human-like language. They use deep learning and the Transformer architecture to predict and produce text based on user prompts.

      Features:

      • Trained on huge datasets (process data through mathematical optimization to minimise prediction errors.)
      • Contain billions of parameters
      • Can answer questions, summarize, translate, write code, and generate content

      Examples:

      • GPT-4
      • LLaMA
      • Claude

      Limitations:

      • May generate inaccurate information
      • Can reflect biases in data
      • Lack true human understanding
    [UPSC 2020] With the present state of development, Artificial Intelligence can effectively do which of the following?(1) Bring down electricity consumption in industrial units (2) Create meaningful short stories and songs (3) Disease diagnosis (4) Text-to-Speech Conversion (5) Wireless transmission of electrical energy Select the correct answer using the code given below:Options: (a) 1, 2, 3 and 5 only (b) 1, 3 and 4 only* (c) 2, 4 and 5 only (d) 1, 2, 3, 4 and 5

  • SHUKR Gene in Flowering Plants

    Why in the News?

    Flowering plants appeared around 130 million years ago and rapidly diversified, puzzling scientists including Charles Darwin, who called it an “abominable mystery”.

    A new study by CSIR-CCMB, Hyderabad, has identified the SHUKR gene, which controls pollen development in flowering plants.

    SHUKR Gene in Flowering Plants

    About the SHUKR Gene in Flowering Plants

    • What is SHUKR? It is a newly discovered gene found in flowering plants like Arabidopsis thaliana. It plays a key role in forming pollen, which plants need to reproduce.
    • Function in the Plant Life Cycle: SHUKR is active during the sporophyte phase (the main plant body stage) and helps in producing healthy, viable pollen.
    • Effect of Gene Loss: If SHUKR is missing or not working, the plant fails to make good pollen, leading to poor or no reproduction.
    • How SHUKR Works: It controls F-box genes, which remove old proteins and replace them with new ones to help pollen grow well.
    • Adaptive Advantage: SHUKR and F-box genes evolve quickly, allowing plants to adjust to harsh conditions like heat, cold, or drought.
    • Evolutionary Origin: This gene first appeared 125 million years ago in eudicots, a plant group that now includes three-fourths of all flowering plants.
    • Why it matters: SHUKR shows that pollen-making is closely linked with the rest of the plant, challenging the earlier belief that these processes were separate.
    • Significance: Climate change causes heat-induced pollen damage in flowering plants, but genes like SHUKR could help develop climate-resilient crops.

    Back2Basics: Darwin’s “Abominable Mystery”

    • Darwin’s Confusion: Charles Darwin was puzzled by the sudden appearance and rapid spread of flowering plants about 130 million years ago — calling it an “abominable mystery”.
    • Mismatch with Evolutionary Pace: According to standard evolution theory, species change slowly over time, but flowering plants diversified very quickly, showing great variety.
    • Genetic Explanation: The SHUKR gene may solve this mystery by showing how flowering plants gained molecular tools to adapt and reproduce faster.
    • New Insight: This discovery offers a genetic explanation for the rapid rise of flowering plants and helps clarify Darwin’s long-standing puzzle.

     

    [UPSC 2017] Consider the following statements:

    1. Genome sequencing can be used to identify genetic markers for disease resistance and drought tolerance in various crop plants.

    2. This technique helps in reducing the time required to develop new varieties of crop plants.

    3. It can be used to decipher the host-pathogen relationships in crops.

    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

     

  • [2nd June 2025] The Hindu Op-ed: Regulating India’s virtual digital assets revolution 

    PYQ Relevance:

    [UPSC 2021] What is Cryptocurrency? How does it affect global society? Has it been affecting Indian society also?

    Linkage: India’s leadership in grassroots crypto adoption and the significant investment by retail investors, indicating its presence and potential impact on Indian society. Understanding this impact is a foundational aspect of the broader discussion on regulating VDAs.

     

    Mentor’s Comment:  The Supreme Court’s recent observation questioning the absence of comprehensive crypto regulation highlights the urgent need for India to replace punitive taxation with structured oversight. Between December 2023 and October 2024, Indian investors traded over ₹2.63 trillion worth of crypto on offshore platforms, causing the country to miss out on substantial tax revenues and governance control. The article emphasizes this contradiction—a rapidly growing industry at the grassroots level and a fragmented, reactionary policy at the top.

    Today’s editorial will talk about the comprehensive crypto regulation. This content would help in GS Paper II ( Governance) and GS Paper III (Science & Technology).

    _

    Let’s learn!

    Why in the News?

    India has kept its top position in grassroots crypto adoption for the second year in a row, according to the 2024 Chainalysis Geography of Crypto report. But this achievement comes at a time when clear regulations are missingand government policies on crypto remain confusing and inconsistent.

    What drives India’s lead in grassroots crypto adoption?

    • High Retail Investor Participation: Indian retail investors have shown strong enthusiasm, investing $6.6 billion into crypto assets (NASSCOM report). Eg: A large number of small-ticket retail trades contribute to India topping Chainalysis’ 2024 grassroots crypto adoption index.
    • Growing Web3 Developer Ecosystem: India hosts one of the fastest-growing Web3 developer communities, driving innovation and ecosystem engagement. Eg: Startups and developers building decentralized apps (dApps) and blockchain solutions across Tier-2 and Tier-3 cities.
    • Youthful Demographic and Digital Penetration: A young, tech-savvy population, high smartphone usage, and digital literacy foster wide crypto experimentation. Eg: College students and freelancers using stablecoins and crypto wallets for micro-transactions and cross-border payments.
    • Lack of Traditional Investment Access and Inflation Hedge: Limited access to formal investment channels and search for inflation-resistant assets prompt people to explore crypto. Eg: Young earners in semi-urban areas using crypto as an alternative to gold or fixed deposits for wealth storage.

    Why did the Supreme Court flag regulatory gaps in 2025?

    • Absence of a Comprehensive Legal Framework: The Court noted the lack of clear and cohesive legislation for Virtual Digital Assets (VDAs), which hampers effective regulation and enforcement. Eg: In May 2025, the Supreme Court remarked, “Banning may be shutting your eyes to ground reality,” highlighting the disconnect between policy and practice.
    • Overreliance on Prohibitive Taxation Instead of Regulation: India imposed heavy taxes (30% capital gains, 1% TDS) as a stop-gap, without establishing regulatory clarity or investor safeguards. Eg: Despite taxation, crypto users shifted to offshore platforms, leading to over ₹60 billion in uncollected TDSand loss of oversight.
    • Risk of Pushing Activity Underground: The absence of regulation combined with enforcement gaps drove users towards non-compliant and unregulated exchanges, increasing systemic risk. Eg: The Court observed that without enabling regulation, users bypassed restrictions via VPNs and mirror sites, undermining regulatory intent.

    Who ensures compliance in India’s crypto ecosystem?

    • Reserve Bank of India (RBI): As the monetary authority, RBI oversees the impact of crypto on financial stability, capital controls, and payment systems. Eg: RBI issued circulars in 2013 and 2018 warning financial institutions against dealing with crypto-related entities.
    • Financial Intelligence Unit-India (FIU-IND): FIU-IND monitors suspicious transactions, enforces anti-money laundering (AML) and counter-terror financing (CFT) norms. Eg: Indian Virtual Asset Service Providers (VASPs) collaborated with FIU-IND to strengthen AML/CFT compliance, gaining positive feedback from FATF.
    • Virtual Asset Service Providers (VASPs): VASPs act as domestic intermediaries ensuring KYC norms, reporting standards, and overall ecosystem transparency. Eg: After the 2024 crypto hack ($230 million loss), Indian VASPs enhanced cybersecurity, created insurance funds, and implemented industry-wide security guidelines.

    Where are most Indian crypto assets traded?

    • Offshore, Non-Compliant Platforms: A significant portion of Indian crypto trading happens on offshore exchanges that do not comply with Indian regulations. Eg: Between July 2022 and December 2023, Indians traded over ₹1.03 trillion worth of VDAs on such platforms.
    • Limited Domestic Exchange Usage: Only about 9% of India’s estimated ₹1.12 trillion worth of crypto assets are held or traded on domestic exchanges. Eg: This limited use reflects investor preference for platforms with broader asset choices or less stringent controls.

    How have Indian Virtual Asset Service Providers (VASPs) improved security and compliance?

    • Strengthened Anti-Money Laundering (AML): Indian VASPs have collaborated closely with the Financial Intelligence Unit-India (FIU-IND) to enhance monitoring and reporting standards. Eg: This cooperation earned positive feedback from the Financial Action Task Force (FATF) for improved compliance.
    • Enhanced Cybersecurity Measures: After the 2024 crypto hack that resulted in a $230 million loss, many Indian exchanges implemented stronger security protocols and real-time risk monitoring. Eg: Exchanges set up dedicated insurance funds to protect users against future thefts.
    • Industry-Wide Standardization and Collaboration: Indian VASPs united to create and enforce common cybersecurity guidelines and best practices across the ecosystem. Eg: This collective effort has improved overall trust and resilience of India’s crypto platforms.

    Way forward: 

    • Formulate a Comprehensive, Risk-Based Regulatory Framework: India must develop clear, future-ready legislation that classifies, governs, and monitors Virtual Digital Assets (VDAs) in alignment with global standards (like FATF, IMF). Eg: A dedicated VDA Regulatory Authority or inclusion under SEBI/RBI oversight can ensure investor protection, AML enforcement, and innovation support.
    • Strengthen Domestic VASP Ecosystem Through Incentives and Integration: Encourage onshore compliance by lowering tax burdens, supporting innovation sandboxes, and integrating VASPs into India’s formal financial ecosystem. Eg: Offering tax rebates or compliance credits to VASPs adopting stringent KYC/CFT and cybersecurity norms can enhance trust and reduce offshore migration.

  • JNCASR develops Fast-Charging Sodium-Ion Battery

    Why in the News?

    Scientists at Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bengaluru have developed a super-fast charging Sodium-ion battery.

    About Sodium-Ion Battery and Its Working:

    • What it is: Sodium-ion batteries are rechargeable batteries that use sodium (Na⁺) ions to carry electric charge, instead of lithium.
    • How it works: During charging and discharging, sodium ions move between the anode (negative) and cathode (positive) — similar to how lithium-ion batteries function.
    • Innovation: A sodium-ion battery developed by JNCASR uses NASICON-type chemistry, a special material structure that ensures fast ion movement and stability.
    • Performance Boost: The team used nano-particles, added a carbon coating, and used aluminium doping to improve charging speed and battery life.
    • Fast Charging & Long Life: The battery can charge up to 80% in 6 minutes and last over 3,000 charge-discharge cycles.
    • Tested for Safety: The battery passed tests using electrochemical cycling and quantum simulations, proving it is safe and durable.

    Advantages over Lithium-Ion Batteries:

    • Sodium is abundant and cheaper than lithium, and it can be extracted from seawater.
    • Sodium-ion batteries are safer, as they can be transported at zero voltage and used in high temperatures without risk of fire.
    • They are more eco-friendly, with less environmental damage during extraction compared to lithium.
    • Material costs are lower because they use aluminium instead of copper.
    • India can reduce its dependence on China, which controls much of the lithium battery supply chain.
    • These batteries are ideal for renewable energy applications, such as solar grids, electric vehicles, drones, and rural electrification in extreme climates.
    [UPSC 2025] In the context of electric vehicles, consider the following elements:

    I. Cobalt II. Graphite III. Lithium IV. Nickel

    How many of the above usually make up battery cathodes?

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

     

  • AMCA Project

    Why in the News?

    The defence minister has cleared the execution model for the Advanced Medium Combat Aircraft (AMCA) project, where Hindustan Aeronautics Limited (HAL) must now compete with private companies for the production contract under a new industry partnership model.

    amca

    About the AMCA Project:

    • Overview: The Advanced Medium Combat Aircraft (AMCA) is India’s fifth-generation stealth fighter being developed by ADA under DRDO.
    • Approval: The project received Cabinet Committee on Security (CCS) approval in March 2024, with a budget of ₹15,000 crore.
    • Timeline: The first prototype is expected by 2028–29, production by 2032–33, and induction by 2034.
    • Key Features:
      • Stealth design, internal weapons bay, and diverterless supersonic intake.
      • Payload: 1,500 kg internal and 5,500 kg external.
      • Fuel: Internal capacity of 6,500 kg.
    • Development Phases:
      1. AMCA Mk1 will use the GE F-414 engine.
      2. AMCA Mk2 will have a co-developed engine with France’s Safran.
    • Strategic Importance: AMCA will help India counter threats from regional powers like China, which already deploy J-20 and J-35 fighters.

    What are 5th Generation Fighter Aircrafts?

    • Definition: Fifth-generation fighters are the most advanced combat aircraft in service today.
    • Examples: Include the F-22 and F-35 (USA), Su-57 (Russia), and J-20 (China).
    • Core Features:
      • Stealth technology to avoid radar detection.
      • Beyond-visual-range (BVR) combat capabilities.
      • AI-based systems and automated battle management.
    • Roles: These jets can perform air combat, surveillance, and ground attacks with precision and multi-role capability.

    What does “Generation” mean in Fighter Aircrafts?

    • Classification: Fighter jets are grouped by technological advances that can’t be added through upgrades.
    • Evolution:
      • 1st–3rd Gen: Basic jets with limited speed and weaponry.
      • 4th Gen: Improved radar, manoeuvrability, and precision weapons (e.g., Rafale, Su-30MKI).
      • 5th Gen: Introduces stealth, super-cruise, sensor fusion, and electronic warfare.
    • Comparative Use: While not a perfect measure, “generation” helps compare air force capabilities across countries.

     

    [UPSC 2025] With reference to India’s defence, consider the following pairs:

    Aircraft type: Description

    I. Dornier-228: Maritime patrol aircraft

    II. IL-76: Supersonic combat aircraft

    III. C-17 Globemaster III: Military transport aircraft

    How many of the pairs given above are correctly matched?

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

     

  • TR1 Cells: The Hidden Warriors in Malaria Immunity

    Why in the News?

    Scientists at Stanford University discovered that TR1 cells play a dominant role in fighting malaria reinfections.

    Understanding the Body’s Immune Response:

    • What is the Immune System? It’s the body’s defence system that protects us from infections like malaria.
    • First Defence: The skin and body surfaces block germs from entering.
    • Innate Immunity: If germs get in, the innate immune system reacts fast, like an emergency response team.
    • Adaptive Immunity: Then, the adaptive immune system kicks in, targeting germs specifically and remembering them for future protection.
    • B-Cells and T-Cells:
      • B-cells make antibodies to fight germs.
      • T-cells attack infected cells and guide other immune cells.
    • Helper T-Cells: A type called CD4+ T-cells helps organise the defence. Earlier, scientists thought TH1 cells were key in malaria, but a new study shows TR1 cells are more important, especially in repeat infections.

    What are TR1 Cells?

    • Role of TR1 Cells: These are special T-cells that help control the immune system and prevent overreaction.
    • Major Response in Malaria: Though small in number, during malaria, TR1 cells become the main helper cells.
    • Study in Uganda: In young children with repeated malaria, TR1 cells grew in number and improved the body’s ability to fight malaria without severe illness.
    • Memory and Immunity: TR1 cells remember the malaria parasite and return stronger with each infection.
    • Types of TR1 Cells:
      • Naïve TR1 – not yet active.
      • Effector TR1 – fighting infection.
      • Memory TR1 – remembering past infections.
    • Epigenetic Role: TR1 cells may respond by switching genes on or off, not by changing the genes themselves.

    Key Findings of the Study:

    • Research Team: Scientists from Stanford University studied people in Uganda over many months and years.
    • Tracking Infections: They followed individuals through multiple malaria infections to see how immune cells behaved.
    • Gene Scanning: A special technique was used to read the genes of each immune cell — like scanning a barcode.
    • Findings: TR1 cells were accurate, long-lasting, and clearly connected to malaria (not other infections).
    • Why it matters: This discovery can help in making better malaria vaccines, boosting long-term protection, and even improving treatments for other serious diseases.
    [UPSC 2025] With reference to monoclonal antibodies, consider the following:

    I. They are man-made proteins. II. They stimulate the patient’s immune system to fight the specific disease. III. They are produced using animal cells only.

    Which of the statements given above are correct?

    Options: (a) I and II only (b) II and III only (c) I and III only (d) All the three *

     

  • New Cambrian sea creature Mosura fentoni discovered in Canada

    Why in the News?

    Scientists have discovered a new sea creature from the Cambrian period named Mosura fentoni, found in Canada’s Burgess Shale, one of the most important fossil sites in the world.

    New Cambrian sea creature Mosura fentoni discovered in Canada

    About Mosura fentoni:

    • Discovery Site: Mosura fentoni was discovered in Canada’s Burgess Shale, a well-known Cambrian fossil site.
    • Biological Group: It belongs to radiodonts, an extinct group of marine predators related to insects, crabs, and spiders.
    • Size and Structure: The creature is very small (1.5 to 6 cm) but has a long, complex body made of 26 segments.
    • Body Zones:
      • The neck supports the head.
      • The mesotrunk has six paddle-shaped flaps for swimming, like mini propellers.
      • The posterotrunk has up to 16 segments with rows of thin gills and small flaps.
    • Breathing Adaptation: The gills in the posterotrunk likely acted as a breathing zone, similar to the tails of horseshoe crabs that help collect oxygen.

    Evolutionary Importance:

    • Arthropod Evolution: The find helps explain how early arthropods (like modern insects and crustaceans) evolved diverse forms.
    • Advanced Abilities: Despite its small size, M. fentoni had specialised swimming and breathing systems.
    • Evolutionary Position: It is placed near the base of the hurdiid family in the radiodont family tree.
    • Segment Specialisation: Its body shows early examples of segment division for specific tasks — a trait common in modern arthropods.
    • Key Insight: The discovery suggests that complex body planning in arthropods began much earlier than previously thought.

    Back2Basics: Cambrian Period:

    • The Cambrian Period is a division of the geologic time scale that lasted from approximately 541 million to 485 million years ago.
    • It is the first period of the Paleozoic Era and follows the Precambrian Eon.
    • It is significant because it marks a time when most major animal groups first appeared in the fossil record.
    • This period is characterized by the development of complex, multicellular life, especially in marine environments.
    • The Cambrian Explosion refers to a relatively short evolutionary event—occurring around 541 million years ago—during which a vast number of new animal species and body plans rapidly emerged.
    • Within about 20 to 25 million years, nearly all major animal phyla (like arthropods, mollusks, and chordates) appeared.
    • This explosion of biodiversity is seen as one of the most important evolutionary events in Earth’s history.

     

    [UPSC 2019] The word ‘Denisovan’ is sometimes mentioned in media in reference to-

    Options: (a) fossils of a kind of dinosaurs (b) an early human species* (c) a cave system found in North-East India. (d) a geological period in the history of Indian subcontinent

     

  • Scientists verify Mendel’s Experiments on Inheritance

    Why in the News?

    Researchers have solved the genetic mysteries behind Mendel’s Experiments on Inheritance, using advanced DNA sequencing and genome analysis.

    About Mendel’s Experiments on Inheritance:

    • Who Was Mendel: Gregor Mendel was an Austrian monk who studied pea plants starting in 1856 to find out how traits like height or color are passed from parents to children.
    • Years of Study: He worked for 8 years and tested over 10,000 plants. His results were shared in 1865 but ignored at the time.
    • Rediscovered Later: In 1900, other scientists realised how important Mendel’s work was.
    • What He Studied: He looked at 7 traits in peas – Seed shape, seed colour, flower colour, pod shape, pod colour, flower position, and plant height.
    • What He Found: Some traits (like round seeds) are stronger than others (like wrinkled seeds). These stronger traits usually show up in the next generation.
    • Why It Matters: Mendel showed that traits are passed through tiny units called genes, and each gene can have different versions called alleles. This became the foundation of genetics.

    Scientists verify Mendel’s Experiments on Inheritance

    What the Study Found (2024):

    • What Scientists Did: In April 2024, scientists studied the DNA of 697 types of pea plants to understand the exact genes behind all 7 traits that Mendel studied.
    • Big Data: They used powerful machines to look at a huge amount of data — as much as 14 billion pages of information!
    • Surprising Results: They found that the pea plant family is more mixed than expected, with 8 different genetic groups due to crossbreeding.
    • New Genetic Details:
      • Pod color changes due to a missing piece of DNA.
      • Pod shape is controlled by 2 specific genes.
      • Flower position changes with a small DNA change.
    • More Than Mendel: They also found 72 other traits related to seeds, pods, leaves, and roots.
    • Why It’s Useful: These findings can help farmers grow better crops, protect plants from diseases, and prepare for climate change.
    [UPSC 2013] Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to

    (1). resist drought and increase absorptive area (2). tolerate extremes of pH (3). resist disease infestation

    Select the correct answer using the codes given below.

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