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Type: Prelims Only

  • What is the Tea Horse Road?

    Prelims Only | History | Mains Paper 1: Arts & Culture

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Tea Horse Road

    Why in the News?

    Recently, China’s Ambassador to India highlighted the historical significance of ‘Tea Horse Road’ in fostering Sino-Indian ties.

    About the Tea Horse Road

    • The Tea Horse Road originated during the Tang Dynasty (618-907 CE).
    • Buddhist monk Yijing (635-713 CE) recorded early trade between China, Tibet, and India, mentioning exchanges of sugar, textiles, and herbs.
    • By the Song Dynasty (960-1279 CE), the trade focused on tea exports to Tibet and importing horses for China’s military.
    • The network spanned over 2,000 km, crossing treacherous mountain passes at altitudes above 10,000 feet.
    • The Tea Horse Road was not a single road but a network of multiple routes. Two primary routes were:
    1. Yunnan Route:  Starting from Pu’er and Dali, passing through Lijiang, reaching Lhasa (Tibet), and extending into India (via Sikkim, Nepal, and Bhutan).
    2. Sichuan Route: Connecting Chengdu (Sichuan) to Tibet and North India.
    • Tea from southwestern China was transported to Tibet, then moved through the Himalayan passes to Kolkata and beyond, reaching Europe and Asia.
    • The rise of modern roads and railways in the mid-20th century led to its gradual decline.

    Historical Significance:

    • Trade & Economy: Connected Tibet and China to India’s markets, facilitating the export of Chinese tea and Tibetan wool to Kolkata while Indian textiles and spices moved northward.
    • Horses for Indian Cavalry: Tibetan horses, transported through the route, were crucial for Indian military campaigns, especially in the Mughal and British periods.
    • Spread of Buddhism: The route enabled Buddhist scholars and monks to travel between Nalanda, Tibet, and China, promoting cultural and religious exchanges.
    • Political & Diplomatic Relations: British India sought control over Sikkim and Tibet’s trade routes, leading to diplomatic interventions like the 1904 British expedition to Tibet.
    • Impact on Himalayan Regions: Strengthened trade and cultural ties between Ladakh, Sikkim, Arunachal Pradesh, and Tibet, influencing their shared heritage and economy.

    PYQ:

    [2018] The China-Pakistan Economic Corridor (CPEC) is viewed as a cardinal subset of China’s larger ‘One Belt One Road’ initiative. Give a brief description of CPEC and enumerate the reasons why India has distanced itself from the same. 

    [2016] ‘Belt and Road Initiative’ is sometimes mentioned in the news in the context of the affairs of

    (a) African Union

    (b) Brazil

    (c) European Union

    (d) China

     

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  • Innovations in Biotechnology and Medical Sciences

    Ultra-Conserved Elements (UCEs) in DNA

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Ultra-Conserved Elements (UCEs) in DNA

    Why in the News?

    Researchers have discovered a reason why certain segments of the human and mouse genomes (Tra2b gene) have remained unchanged for 80 million years. These segments, known as ultra-conserved elements (UCEs), play a vital role in regulating protein production

    What are Ultra-Conserved Elements (UCEs) in DNA?

    • Ultra-Conserved Elements (UCEs) are long, highly conserved DNA sequences (200+ base pairs) that have remained unchanged for millions of years across multiple species, including humans, mice, rats, chickens, and even fish.
    • Key Characteristics:
      • Found in both coding (gene) and non-coding (regulatory) regions of the genome.
      • Do not tolerate mutations, meaning they remain identical across species for tens of millions of years.
      • Many UCEs do not code for proteins but play crucial roles in gene regulation and cellular function.
    • Their importance:
      • Evolutionary Significance: Their extreme conservation suggests they are essential for survival, as any mutation would likely be harmful.
      • Gene Regulation: UCEs may function as enhancers or silencers, controlling when and where genes are activated.
      • Developmental Roles: They are often linked to brain development, fertility, and immune response.
      • Disease Prevention: UCEs may protect against genetic disorders and cancers by stabilizing gene expression.

    Why do Human and Mouse Genomes overlap?

    • Humans and mice share a common mammalian ancestor that lived around 80 million years ago.
    • Genomic Similarity:
      • Around 85% of mouse genes have direct counterparts in humans.
      • Nearly 500 UCEs are identical between humans and mice, despite millions of years of evolution.
    • Many fundamental processes like cell division, metabolism, and brain function are similar between species, necessitating high conservation of crucial DNA regions.
    • Medical Research:
      • Because of these similarities, mice serve as a model organism for studying human genetics, diseases, and drug responses.
      • UCEs help scientists understand gene function across species, leading to insights into evolution and biomedical advancements.

    PYQ:

    [2013] Recombinant DNA technology (Genetic Engineering) allows genes to be transferred

    1. across different species of plants

    2. from animals to plants

    3. from microorganisms to higher organisms

    Select the correct answer using the codes given below:

    (a) 1 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

     

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  • International Space Agencies – Missions and Discoveries

    SPHEREx Telescope

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: SPHEREx Telescope

    Why in the News?

    NASA is set to launch its latest space telescope, SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer) aboard a SpaceX Falcon 9 rocket from California.

    What is the SPHEREx Telescope?

    • SPHEREx is a new space telescope developed by NASA.
    • It is designed to map the entire sky in infrared light and provide insights into the origins of the universe, galaxy formation, and the distribution of life-forming molecules.
    • Its mission is expected to last 2 years, during which it will survey the sky 4 times.
    • Key Features of SPHEREx:
      • Infrared Spectroscopy: Unlike traditional optical telescopes, SPHEREx will capture the universe in 102 infrared colors, which are invisible to the human eye.
      • Wide-Sky Coverage: Unlike the James Webb Space Telescope (JWST), which focuses on narrow regions, SPHEREx will map the entire sky every 6 months.
      • High Data Output: It will collect data on one billion galaxies, 100 million stars, and 10,000 asteroids, creating an unprecedented cosmic map.
      • Study of Cosmic Inflation: SPHEREx will analyze the earliest moments after the Big Bang, helping scientists understand how the universe expanded rapidly in its infancy.
      • Search for Life-Forming Molecules: The telescope will identify biogenic molecules like water, carbon dioxide, and methanol in the Milky Way galaxy, revealing where the building blocks of life exist.

    SPHEREx Telescope

    How will SPHEREx Create the “Most Colourful” Map of the Cosmos?

    • Spectroscopic Imaging: SPHEREx will divide light from celestial objects into 96 infrared bands, significantly more than previous sky-mapping telescopes.
    • Mapping Galactic Evolution: By observing 450 million galaxies, SPHEREx will reveal how they evolved over cosmic history.
    • Identifying Cosmic Ice: The telescope will detect frozen water and organic molecules in interstellar dust clouds, essential for understanding planetary formation.
    • Unprecedented Infrared Insights: Unlike Hubble, which focuses on optical light, and JWST, which targets deep-space infrared observations, SPHEREx will capture broad infrared spectra across the entire sky, revealing hidden cosmic structures.

    PYQ:

    [2015] In the context of modern scientific research, consider the following statements about ‘IceCube’, a particle detector located at South Pole, which was recently in the news:

    1. It is the world’s largest neutrino detector, encompassing a cubic kilometre of ice.
    2. It is a powerful telescope to search for dark matter.
    3. It is buried deep in the ice.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

     

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  • Modern Indian History-Events and Personalities

    Veer Savarkar and His Contributions

    Prelims Only | History | Mains Paper 1: Modern Indian History

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Veer Savarkar

    Why in the News?

    Prime Minister paid tribute to Veer Savarkar on his death anniversary (26th February), acknowledging his contributions to India’s freedom movement.

    About Veer Savarkar: Life, Contributions, and Legacy

    Details
    Who was Veer Savarkar? • Born on May 28, 1883, in Bhagur, Maharashtra.
    • Founded Abhinav Bharat Society (1904) for armed resistance.
    • Led India House in London (1906) and the Free India Society.
    • Arrested in 1910, sentenced to life imprisonment in Cellular Jail (Kala Pani, Andaman & Nicobar Islands).
    • Became President of the Hindu Mahasabha (1937-1943).
    • Died on February 26, 1966, after fasting till death.
    His Contributions • Advocated armed revolution against British rule.
    • Coined Hindutva (1923), defining Indian identity beyond religion.
    • Opposed Partition, emphasizing Hindu political unity.
    • Championed military nationalism over passive resistance.
    • Writings and ideology influenced Indian nationalist movements.
    Literary Works • The First War of Indian Independence (1909):  Reinterpreted the 1857 Revolt as a nationalist struggle.
    • Hindutva: Who is a Hindu? (1923): Laid the ideological foundation of Hindutva.
    • My Transportation for Life (1950): Memoirs of his imprisonment in Cellular Jail.
    • Six Glorious Epochs of Indian History: Advocated Hindu resistance against foreign invaders.
    Controversies • Gandhi Assassination Case (1948): Arrested but acquitted due to lack of evidence.
    • Mercy Petitions (1911-1924): Wrote clemency petitions for early release from prison, debated as tactical or compromising.
    • Opposition to Quit India Movement (1942): Rejected Gandhi’s call, favored military strength over civil disobedience.
    • Hindutva Ideology: Critics claim it fostered religious divisions, while supporters see it as reviving Hindu identity.

     

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  • Climate Change Negotiations – UNFCCC, COP, Other Conventions and Protocols

    ‘Cali Fund’ launched at CBD COP16

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Cali Fund

    Why in the News?

    A new international biodiversity fund, the ‘Cali Fund’, was launched at the 16th Conference of Parties (COP16) to the United Nations Convention on Biological Diversity (CBD) in Rome.

    What is the Cali Fund?

    • The Cali Fund is an international biodiversity financing mechanism launched on February 25, 2025, at COP16 of the UN Convention on Biological Diversity (CBD) in Rome.
    • It collects funds from private companies that utilize Digital Sequence Information (DSI) from nature in their businesses.
    • The fund supports biodiversity conservation, scientific research, and indigenous communities.

    Key Features of the Cali Fund:

    • Funding Source: Businesses using genetic data (DSI) from plants, animals, and microorganisms will contribute financially.
    • Utilization of Funds:
      • 50% allocated to indigenous and local biodiversity projects.
      • Supports scientific research and developing nations’ biodiversity action plans.
    • Global Management: Managed by UNDP and UNEP, with MPTFO handling finances.
    • Alignment with Global Goals: Supports Kunming-Montreal Global Biodiversity Framework (KMGBF) to reverse biodiversity loss by 2030.
    • First-of-Its-Kind: Direct private sector contributions to a global UN biodiversity fund.

    What is Digital Sequence Information (DSI)?

    • DSI refers to genetic data extracted from plants, animals, and microorganisms.
    • Used extensively in industries such as:
      • Pharmaceuticals (medicine development).
      • Cosmetics (natural ingredient research).
      • Agriculture (crop improvement, pest resistance).
      • Biotechnology (genetic engineering, bioinformatics).

    About the Convention on Biological Diversity (CBD):

    • The CBD, with 196 contracting parties, stands as the most comprehensive international agreement focused on nature conservation and the sustainable use of natural resources.
    • It was opened for signing at the 1992 UN Conference on Environment and Development in Rio de Janeiro.
    • The CBD has 3 main objectives:
    1. Conservation of biological diversity (including genetic, species, and habitat diversity).
    2. Sustainable use of biological diversity.
    3. Fair and equitable sharing of benefits arising from the use of genetic resources.
    • It addresses biodiversity at all levels: ecosystems, species, and genetic resources.
    • The Conference of the Parties (COP) is the CBD’s governing body, and it meets biennially to assess progress, set priorities, and develop action plans.
    • The Secretariat of the CBD is located in Montreal, Canada.
    • To further its goals, the CBD includes two binding protocols:
    1. The Cartagena Protocol (2000), which regulates the transboundary movement of living modified organisms (LMOs) and came into force in 2003.
    2. The Nagoya Protocol (2010), which provides a legal framework for the access to genetic resources and the fair sharing of benefits from their use.

    PYQ:

    [2014] With reference to ‘Global Environment Facility’, which of the following statements is/are correct?

    (a) It serves as financial mechanism for ‘Convention on Biological Diversity’ and ‘United Nations Framework Convention on Climate Change’

    (b) It undertakes scientific research on environmental issues at global level

    (c) It is an agency under OECD to facilitate the transfer of technology and funds to underdeveloped countries with specific aim to protect their environment.

    (d) Both A and B

     

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  • Wildlife Conservation Efforts

    Species in news: Gharials

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Gharial

    Why in the News?

    Madhya Pradesh CM released 10 gharials into the Chambal River at the National Chambal Gharial Sanctuary in Morena.

    Species in news Gharials

    About Gharial

    • The gharial (Gavialis gangeticus) is a unique species of crocodilian, characterized by its long, slender snout, which is perfectly adapted for catching fish.
    • The species derives its name from the “ghara”, a bulbous growth found on the snouts of adult males, which aids in vocalization and mating displays.
    • It is a fish-eating crocodile native to the Indian subcontinent.
    • They are a crucial indicator of clean river water.

    Conservation Status:

    • Recognizing the rapid decline in gharial populations, India launched captive breeding and release programs in the late 1970s.
    • Between 1975 and 1982, the country established 16 captive breeding centers and 5 protected sanctuaries to ensure the survival of the species.
    • Gharials are ‘Critically Endangered’ in the IUCN Red List of Species.
    • The species is also listed under Schedule I of the Wildlife (Protection) Act, 1972.
    • Today, gharials primarily survive in 5 major refuges:
    1. National Chambal Sanctuary (NCS) – The largest stronghold of gharials.
    2. Katerniaghat Wildlife Sanctuary in Uttar Pradesh.
    3. Chitwan National Park in Nepal.
    4. Son River Sanctuary in Madhya Pradesh.
    5. Satkosia Gorge Sanctuary in Odisha.

    PYQ:

    [2013] Consider the following fauna of India:

    1. Gharial

    2. Leatherback turtle

    3. Swamp deer

    Which of the above is/are endangered?

    (a) 1 and 2 only

    (b) 3 only

    (c) 1, 2 and 3

    (d) None

     

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  • Waste Management – SWM Rules, EWM Rules, etc

    What is Black Plastic?

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Black Plastic

    Why in the News?

    A recent study suggested that black plastic contains harmful flame retardants, which may leach into food at hazardous levels.

    What is Black Plastic?

    • Black plastic is often made from recycled electronic waste like old computers, TVs, and appliances.
    • These electronics contain flame retardants (such as bromine-based compounds), heavy metals (lead, cadmium, mercury), and other hazardous chemicals.
    • Flame retardants are added to prevent fire hazards, but they can persist in recycled plastics.
    • Many of these chemicals are now banned in several countries due to their toxicity.
    • However, legacy plastics containing these substances continue to enter the recycling stream, leading to contamination of household products.

    Threats Posed by Black Plastic:

    • Contains Toxic Chemicals: Made from recycled e-waste, it may have flame retardants, heavy metals, and antimony.
    • Food Contamination: Heat and acidic foods can leach harmful chemicals into meals.
    • Environmental Impact: Difficult to recycle, it pollutes landfills and groundwater.
    • Health Risks: Linked to hormonal issues, neurological damage, and cancer.

    PYQ:

    [2019] Why is there a great concern about the ‘microbeads’ that are released into environment?

    (a) They are considered harmful to marine ecosystems.

    (b) They are considered to cause skin cancer in children.

    (c) They are small enough to be absorbed by crop plants in irrigated fields.

    (d) They are often found to be used as food adulterants.

     

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  • Gravitational Wave Observations

    New Experiment to Test Quantum Gravity

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Quantum Gravity

    Why in the News?

    A new proposal published on October 29, 2024, suggests an experiment that could provide direct evidence for quantum gravity, unifying general relativity and quantum mechanics. A new experiment proposes testing weak gravitational fields at the quantum level, a historic breakthrough in physics if successful.

    What is Quantum Gravity?

    • Quantum Gravity is a theoretical framework that aims to unify general relativity (which explains gravity at large scales) and quantum mechanics (which governs subatomic particles).
    • Since gravity behaves differently from the other fundamental forces in quantum mechanics, physicists have been searching for a theory that integrates gravity into the quantum world.
    • General relativity treats gravity as the curvature of spacetime, while quantum mechanics describes forces through particle interactions.
    • Gravity has never been directly observed in quantum form, unlike the other fundamental forces.
    • Theories like String Theory and Loop Quantum Gravity attempt to explain quantum gravity but lack experimental validation.

    Significance of the Experiment

    • First Realistic Test for Quantum Gravity: Most quantum gravity theories rely on extreme conditions (e.g., black holes), making them impossible to test. This experiment provides a lab-based alternative.
    • Testing Gravity at the Quantum Level: If a small mass in quantum superposition is influenced by gravity, it could prove gravity itself is quantum in nature.
    • Weak Gravity Instead of Strong Gravity: Unlike previous studies focused on black holes, this experiment explores weak gravitational interactions, making it more feasible.
    • Towards a Unified Theory of Physics: Proving quantum gravity could merge general relativity and quantum mechanics, solving a major gap in modern physics.
    • Challenging Existing Theories: If results differ from both classical and quantum predictions, it could suggest a new force or a modified gravity theory.

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  • Modern Indian History-Events and Personalities

    Battle of Karnal (1739)

    Prelims Only | History | Mains Paper 1: Arts & Culture

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Battle of Karnal

    Why in the News?

    On February 24, 1739, the Battle of Karnal marked a turning point in the history of Mughal empire.

    About Battle of Karnal 

    • The Battle of Karnal on February 24, 1739, saw Nadir Shah’s Persian army defeat Mughal Emperor Muhammad Shah ‘Rangila’ in under three hours.
    • Despite having 300,000 soldiers, the Mughal army was crushed by Nadir Shah’s 55,000 well-trained troops using modern tactics and superior firearms.
    • Following the victory, Delhi was sacked, 30,000 civilians massacred, and the Mughal treasury looted, including the Koh-i-Noor diamond and the Peacock Throne.

    Impact on Mughal Decline

    • Economic Collapse: The Mughal treasury was emptied, crippling military and administrative strength.
    • Weakening Central Power: Governors of Bengal, Awadh, and Hyderabad declared independence.
    • Military Decline: The Mughal army’s outdated tactics were exposed; future invasions (e.g., Ahmad Shah Abdali, 1748-1761) followed.
    • Rise of Regional Powers: The Marathas expanded, eventually capturing Delhi (1771); the Sikhs grew in Punjab.
    • British Expansion: The East India Company took advantage, leading to British rule after 1857.

    PYQ:

    [2019] With reference to Mughal India, what is/are the difference/differences between Jagirdars and Zamindar?

    1. Jagirdars were holders of land assignments in lieu of judicial and police duties, whereas Zamindars were holders of revenue rights without obligation to perform any duty other than revenue collection.

    2. Land assignments to Jagirdars were hereditary and revenue rights of Zamindars were not hereditary.

    Select the correct answer using the codes given below:

    (a) 1 only

    (b) 2 only

    (c) Both 1 and 2

    (d) Neither 1 nor 2

     

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  • Government Budgets

    What is the ‘Quality of Public Expenditure’ Index?

    Prelims Only | Economics | Mains Paper 3: Indian Economy

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: 'Quality of Public Expenditure' Index

    Why in the News?

    The Quality of Public Expenditure (QPE) Index, developed by the RBI, evaluates how efficiently government funds are used, focusing on expenditure composition and its long-term impact on economic growth.

    About the QPE Index

    • The QPE Index by the Reserve Bank of India (RBI) measures how effectively government funds are utilized.
    • It focuses on fiscal discipline, capital investment, and efficient allocation of public resources for long-term growth.
    • Key Indicators of the QPE Index:
    1. Capital Outlay to GDP Ratio: Measures government spending on infrastructure as a percentage of GDP. Higher ratio = better quality expenditure.
    2. Revenue Expenditure to Capital Outlay Ratio: Lower ratio preferred, as excessive spending on salaries & subsidies reduces funds for development.
    3. Development Expenditure to GDP Ratio: Tracks spending in education, healthcare, infrastructure, improving human capital & productivity.
    4. Development Expenditure as % of Total Expenditure:  Higher share indicates better resource allocation.
    5. Interest Payments to Total Expenditure Ratio:  Lower ratio = better debt management & fiscal sustainability.

    Key Findings from RBI’s QPE Index Analysis:

    • 1991-2003: Post-liberalization, focus on reducing fiscal deficit led to a decline in public investment.
    • 2003-2008:  FRBM Act (2003) improved fiscal discipline, increasing capital spending & state revenues.
    • 2008-2013: Global Financial Crisis (GFC) led to higher government spending, increasing fiscal deficits but supporting recovery.
    • 2013-2017: 14th Finance Commission (2015) increased states’ share in central taxes, boosting development expenditure.
    • 2017-2020:  GST implementation challenges affected the Centre’s revenues, but states benefited from higher tax shares.
    • 2020-Present:  Record capital expenditure boosted infrastructure & economic recovery, improving public expenditure quality.

    PYQ:

    [2014] With reference to Union Budget, which of the following, is/are covered under Non-Plan Expenditure?

    1. Defence-expenditure

    2. Interest payments

    3. Salaries and pensions

    4. Subsidies

    Select the correct answer using the code given below:

    (a) 1 only

    (b) 2 and 3 only

    (c) 1, 2, 3 and 4

    (d) None

     

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