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Type: Prelims Only

  • Innovations in Biotechnology and Medical Sciences

    How Vitamin D deficiency can trigger autoimmune conditions?

    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: Autoimmune Conditions, Vitamin D

    Why in the News?

    Recent research conducted by scientists at McGill University has shed light on the critical role of vitamin D in maintaining thymus health and its implications for immune function.

    About Autoimmune Conditions:

    • Autoimmune conditions refer to disorders where the immune system mistakenly attacks the body’s own healthy tissues, viewing them as foreign.
    • Vitamin D plays a role in regulating immune responses and promoting immune tolerance—the body’s ability to avoid attacking its own cells.
    • It influences T-cells (a type of immune cell) to recognize and tolerate the body’s own tissues rather than attacking them.
    • The thymus gland trains T-cells to avoid attacking healthy cells. A deficiency in Vitamin D may cause the thymus to age prematurely, reducing its ability to regulate T-cells properly.
      • Vitamin D affects certain genetic pathways related to immune function.
      • Variations in the vitamin D receptor (VDR) gene may also predispose some individuals to autoimmune diseases, and these individuals might be more sensitive to Vitamin D levels.

    What is Vitamin D?

    • Vitamin D is a fat-soluble vitamin crucial for the body’s ability to absorb calcium, magnesium, and phosphate, which are essential for bone health.
    • It supports muscle movement, nerve function, and immune system responses. Due to its synthesis in the skin upon exposure to sunlight, it is often called the ‘sunshine vitamin’.
    • The body naturally produces Vitamin D when skin is exposed to ultraviolet B (UVB) rays from sunlight.
    • Sources of Vitamin D:
      • Fish: Salmon, mackerel, tuna, and sardines are rich in Vitamin D.
      • Cod liver oil: A concentrated source, providing 400–1,000 IU per teaspoon.
      • Mushrooms: Varieties like portobello contain Vitamin D if exposed to UV light.
      • Fortified Foods: Milk, yogurt, orange juice, and cereals often have added Vitamin D.
      • Egg yolks: Contain a small amount of Vitamin D.
      • Common forms include Vitamin D2 (ergocalciferol) and Vitamin D3 (cholecalciferol), especially useful in autumn and winter when sunlight exposure is limited.

    Significance of Vitamin D

    • Bone Health: Essential for calcium absorption, which strengthens bones and prevents osteoporosis.
    • Muscle and Nerve Function: Supports muscle contractions and nerve signaling between the brain and body.
    • Immune System: Enhances immune defenses, helping to fight off infections by viruses and bacteria.
    • Brain Health: May play a role in maintaining cognitive health, especially with aging.
    • Inflammation and Pain: Helps regulate the body’s response to inflammation and pain.
    • Blood Pressure: Linked to regulating blood pressure; deficiency is associated with hypertension.

    Impacts of Vitamin D Deficiency

    • Increases the risk of rickets in children (softening of bones) and osteoporosis in adults.
    • Low levels of Vitamin D are linked to autoimmune conditions like rheumatoid arthritis, lupus, and multiple sclerosis.
    • Recent studies indicate that Vitamin D deficiency can accelerate thymus aging, leading to immune dysfunction and a higher risk of autoimmune diseases.
    • Deficiency has been associated with cancer, cardiovascular disease, diabetes, depression, and chronic pain.
    • Can include fatigue, muscle weakness, bone pain, and depression.
    • In severe cases, deficiency may cause impaired bone growth and fracture susceptibility.

    PYQ:

    [2011] Regular intake of fresh fruits and vegetables is recommended in the diet since they are a good source of antioxidants. How do antioxidants help a person maintain health and promote longevity?

    (a) They activate the enzymes necessary for vitamin synthesis in the body and help prevent vitamin deficiency.

    (b) They prevent excessive oxidation of carbohydrates, fats and proteins in the body and help avoid unnecessary wastage of energy.

    (c) They neutralize the free radicals produced in the body during metabolism.

    (d) They activate certain genes in the cells of the body and help delay the ageing process.

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  • Animal Husbandry, Dairy & Fisheries Sector – Pashudhan Sanjivani, E- Pashudhan Haat, etc

    [pib] Development of Tuna Cluster in Andaman and Nicobar Islands

    Prelims Only | Agriculture | Mains Paper 3: Economics Of Animal-Rearing

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Tuna Fish, PMMSY

    Why in the News?

    The Department of Fisheries has notified the creation of a Tuna Cluster in the Andaman and Nicobar Islands as part of the Pradhan Mantri Matsya Sampada Yojana (PMMSY).

    • The A&N Islands offer significant opportunities for fisheries development with approximately 6.0 lakh square km of Exclusive Economic Zone (EEZ).
    • This region has rich sea resources, particularly Tuna and Tuna-like species, with an estimated potential of 60,000 metric tons.
    • The islands’ location near Southeast Asia enables efficient sea and air trade, and the pristine waters support sustainable fishing.

    About Tuna Species and its Significance

    • Tuna are large, fast-swimming fish belonging to the Thunnini tribe within the Scombridae family.
    • Known for their streamlined bodies and remarkable agility, tuna are found in tropical and temperate oceans worldwide.
    • There are over 15 species of tuna, with some of the most well-known being Bluefin, Yellowfin, Albacore, Bigeye, and Skipjack.
    • Tuna can grow quickly and live for several decades, with species like Bluefin reaching over 450 kg in weight.
    • It is one of the most popular and valuable fish in the global seafood market, highly sought after for its flavor, texture, and nutritional value.
    • Species like Bluefin tuna are particularly valuable, often fetching high prices in markets, especially in Japan for dishes like sushi and sashimi.
    • It is rich in protein, low in saturated fat, and packed with omega-3 fatty acids, which support heart health, brain function, and inflammation reduction.
    • It also provides essential vitamins and minerals like Vitamin D, B12, iron, and selenium.

     

    PYQ:

    [2013] The most important fishing grounds of the world are found in the regions where

    (a) Warm and cold atmospheric currents meet

    (b) Rivers drain out large amounts of freshwater into the sea

    (c) Warm and cold oceanic currents meet

    (d) Continental shelf is undulating

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  • Festivals, Dances, Theatre, Literature, Art in News

    Jagannath Puri Temple

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Jagannath Puri Temple

    Why in the News?

    Odisha’s law minister recently clarified that there was no secret chamber inside the treasury of the Jagannath Temple in Puri.

    About Jagannath Puri Temple

    • The Jagannath Temple is an important Vaishnavite temple dedicated to Jagannath, a form of Sri Krishna in Puri in Odisha.
    • The present temple was rebuilt from the 10th century onwards, on the site of an earlier temple, and begun by Anantavarman Chodaganga Deva, the first king of the Eastern Ganga dynasty.
    • The Puri temple is famous for its annual Ratha Yatra, or chariot festival, in which the three principal deities are pulled on huge and elaborately decorated temple cars.

    It’s Architecture:

    • With its sculptural richness and fluidity of the Oriya style of temple architecture, it is one of the most magnificent monuments of India.
    • The huge temple complex covers an area of over 400,000 square feet and is surrounded by a high fortified wall.
    • This 20 feet high wall is known as Meghanada Pacheri.
    • Another wall known as kurma bedha surrounds the main temple.

    The temple has four distinct sectional structures, namely:

    1. Deula, Vimana or Garba griha (Sanctum sanctorum) where the triad deities are lodged on the ratnavedi (Throne of Pearls). In Rekha Deula style;
    2. Mukhashala (Frontal porch);
    3. Nata mandir/Natamandapa, which is also known as the Jagamohan (Audience Hall/Dancing Hall), and
    4. Bhoga Mandapa (Offerings Hall)

    PYQ:

    [2012] The Nagara, the Dravida and the Vesara are the:

    (a) Three main racial groups of the Indian subcontinent

    (b) Three main linguistic divisions into which the languages of India can be classified

    (c) Three main styles of Indian temple architecture

    (d) Three main musical Gharanas prevalent in India

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  • Festivals, Dances, Theatre, Literature, Art in News

    First Asian Buddhist Summit

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: First Asian Buddhist Summit

    Why in the News?

    The Government of India, in collaboration with the International Buddhist Confederation (IBC), held the first Asian Buddhist Summit (ABS) in New Delhi.

    About the Asian Buddhist Summit (ABS)

    • ABS is a high-level conference organized to bring together Buddhist leaders, scholars, and practitioners from across Asia.
    • The theme of the first summit was ‘Role of Buddha Dhamma in Strengthening Asia’.
    • It aligns with India’s Act East Policy, aiming to deepen cultural and spiritual ties across Asian nations.
    • Key topics discussed at the summit include:
      • The role of Buddhist art, architecture, and heritage.
      • The dissemination of Buddha Dhamma and its cultural influence across Asia.
      • The significance of holy Buddhist relics and their societal impact.
      • The relevance of Buddhist philosophy and literature in the 21st century.
      • Exploring the relationship between Buddhism and scientific research for health and well-being.

     

    About Buddhism:

    Details
    Origin of Buddhism • Originated in India over 2,600 years ago.
    • Founded by Siddhartha Gautama (the Buddha) around 563 BCE.
    • Born into the royal family of the Sakya clan in Lumbini, near the Indo-Nepal border.
    • At age 29, Gautama renounced a life of luxury and embraced asceticism.
    • Attained Bodhi (enlightenment) after 49 days of meditation under a pipal tree in Bodhgaya, Bihar.
    • Delivered his first sermon in Sarnath, known as Dharma-Chakra-Pravartana.
    • Died at 80 in Kushinagara (Mahaparinirvana) in 483 BCE.
    Tenets of Buddhism • Advocated the Madhyam Marg (Middle Path) between indulgence and asceticism.
    • Emphasized individual responsibility for happiness.
    • Four Noble Truths (ariya-sachchani):
    1. Dukkha: Suffering is inherent.
    2. Samudya: Every suffering has a cause.
    3. Nirodha: Suffering could be extinguished.
    4. Atthanga Magga: Achieved through the Eightfold Path.
    • Eightfold Path (astangika marg): Right view, intention, speech, action, livelihood, mindfulness, effort, concentration.
    • Ultimate goal: Attaining Nirvana (Nibbana).
    • Five Precepts (Panchasil): Prohibitions against violence, stealing, sexual misconduct, lying, and intoxicants.
    Major Buddhist Texts • Initially oral teachings, memorized by the Sangha.
    • Written down around 25 BCE in Pali.
    • Three Pitakas:
    1. Vinaya Pitaka: Monastic rules.
    2. Sutta Pitaka: Main teachings, divided into five Nikayas (Digha, Majjhima, Samyutta, Anguttara, Khuddaka).
    3. Abhidamma Pitaka: Philosophical analysis of teachings.
    • Other important texts: Divyavadana, Dipavamsa, Mahavamsa, Milind Panha.
    Role of the Buddhist Councils • Important turning points in early Buddhism, leading to sectarian clashes and the Great Schism.
    • Four Major Councils:
    1. First Council (483 BCE): Presided by Mahakasyapa, aimed to preserve teachings.
    2. Second Council (383 BCE): Addressed monastic discipline.
    3. Third Council (250 BCE): Under Ashoka, focusing on spreading Buddhism.
    4. Fourth Council (72 CE): Led to division into Mahayana and Hinayana.
    Different Schools of Buddhism • Mahayana: “Great Vehicle,” emphasizes Bodhisattva ideal and idol worship; spread to Central and East Asia.
    • Hinayana: “Lesser Vehicle,” focuses on individual salvation and original teachings; Theravada is a major branch.
    • Theravada: Closest to original teachings; dominant in Cambodia, Laos, Myanmar, Sri Lanka, and Thailand.
    • Vajrayana: “Vehicle of the Thunderbolt,” complex rituals; developed around 900 CE.
    • Zen: Focuses on meditation, developed in China and Japan.
    Spread of Buddhism in Ancient India • Monastic organization through Sangha for spreading teachings.
    • Rapid growth during Buddha’s lifetime.
    • Ashoka’s influence post-Kalinga conquest; adopted Dhamma conquest, sending missions to various regions, including Gandhara, Kashmir, Greece, Sri Lanka, Burma (Myanmar), Egypt, and Thailand.

     

    PYQ:

    [2020] With reference to the religious history of India, consider the following statements:

    1. Sthaviravadins belong to Mahayana Buddhism.

    2. Lokottaravadin sect was an offshoot of Mahasanghika sect of Buddhism.

    3. The deification of Buddha by Mahasanghikas fostered the Mahayana Buddhism.

    Which of the statements given above is/are correct?

    (a) 1 and 2 only

    (b) 2 and 3 only

    (c) 3 only

    (d) 1, 2 and 3

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  • ISRO Missions and Discoveries

    Does the Sun rotate?

    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: Sun’s Rotation

    sun

    Why in the News?

    Indian astronomers at the Kodaikanal Solar Observatory (KSO) have achieved a groundbreaking feat by mapping, for the first time, the variation in the Sun’s rotation speed from its equator to its poles.

    Sun’s Rotation: Key Facts

    • Unlike a solid body, the Sun exhibits differential rotation, meaning different parts of the Sun rotate at different speeds.
    • The rotation speed varies depending on latitude, with faster rotation near the equator and slower rotation toward the poles.
    • This variation is primarily due to the Sun’s composition of gaseous plasma rather than solid material.

    Rotation Period Variation by Latitude:

    • Equatorial Regions: The rotation period at the equator is the fastest, around 24.47 days (sidereal rotation).
    • Sunspot Zones (about 16 degrees latitude): Rotation slows slightly, with a period of about 27.3 days.
    • Higher Latitudes (up to 75 degrees): Rotation slows significantly; for example, at 75 degrees latitude, the rotation period is about 33.4 days.
    • Poles: The slowest rotation occurs at the poles, with a period around 31.1 days.

    Sidereal vs. Synodic Rotation Periods:

    • Sidereal Rotation Period: The time taken for the Sun to complete one full rotation relative to distant stars. It varies by latitude, from 24.47 days at the equator to around 33.4 days at higher latitudes.
    • Synodic Rotation Period: This is the time for a fixed feature on the Sun to appear in the same position when observed from Earth. It is longer than the sidereal period due to Earth’s own movement around the Sun, averaging around 26.24 days.

    Why Differential Rotation Occur?

    • Gaseous Plasma Composition: The Sun is composed of plasma—a hot, ionized state of matter—which allows its different regions to rotate at different speeds.
    • Convective Zone Dynamics: The outer convective layer of the Sun contributes to differential rotation. Plasma circulates, rising and sinking, which influences the rotational speed at different latitudes.

    Scientific Implications

    • Solar Dynamo Theory: The differential rotation of the Sun is central to theories about the solar dynamo—the process that generates the Sun’s magnetic field.
    • Mystery of Differential Rotation: Despite extensive research, the exact mechanism behind the Sun’s differential rotation remains an active area of investigation in solar physics.

    PYQ:

    [2013] Consider the following phenomena

    1. Size of the sun at dusk

    2. Colure of the sun at dawn

    3. Moon being visible at dawn

    4. Twinkle of stars in the sky

    5. Polestar being visible in the sky

    Which of the above are optical illusions?

    (a) 1, 2 and 3

    (b) 3, 4 and 5

    (c) 1, 2 and 4

    (d) 2, 3 and 5

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  • Gravitational Wave Observations

    First ‘Black Hole Triple’ System Discovered

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Black Hole Triple and its formation

    Scientists have discovered a “black hole triple” in space, marking the first time such a system has been identified.

    Why in the News?

    Scientists have discovered a “black hole triple” in space, marking the first time such a system has been identified.

    Black Hole Triple: What does it mean?

    • Many black holes are found in binary systems with another star or black hole.
    • This triple system includes two stars orbiting a black hole:
      • The nearer star orbits the black hole every 6.5 days.
      • The distant star orbits approximately every 70,000 years.
    • The system, located in the constellation Cygnus, features V404 Cygni, one of the oldest black holes known, which is nine times larger than the Sun.
    • It is 8,000 light years away from Earth.

    What is a Black Hole?

    • A black hole is a space region with such strong gravity that no light or matter can escape.
    • Most black holes form from supernova explosions—the death of massive stars.
    • This triple system suggests an alternative, less violent formation process.

    How was it discovered?

    • Researchers from Caltech and MIT discovered the system while reviewing astronomical data from telescopes.
    • They described the stars as being gravitationally bound, indicating they form a triple system.
    • It is believed that  V404 Cygni did not form through a supernova explosion, which typically ejects outer stars.
    • Instead, it likely formed through direct collapse: the star collapsed inward without exploding.
    • Known as a “failed supernova”, this process causes an implosion without expelling matter, leading to a gentler black hole formation.

    Future of the Triple System

    • The triple system may not remain as such, as V404 Cygni is consuming the nearby star.
    • This discovery suggests that some existing binary systems may have originally been triple systems, where the black hole later consumed one of its members.

    PYQ:

    [2019] Recently, scientists observed the merger of giant ‘blackholes’ billions of light-years away from the Earth. What is the significance of this observation?

    (a) ‘Higgs boson particles’ were detected.
    (b) ‘Gravitational waves’ were detected.
    (c) Possibility of inter-galactic space travel through ‘wormhole’ was confirmed.
    (d) It enabled the scientists to understand ‘singularity’

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  • Railway Reforms

    Kalka-Shimla Heritage Railway Track

    Prelims Only | Economics | Mains Paper 3: Infrastructure: Energy, Ports, Roads, Airports, Railways Etc.

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Kalka-Shimla Heritage Railway

    Why in the News?

    • Himachal Pradesh CM has requested the Centre to consider running the Kalka-Shimla narrow-gauge railway—a UNESCO World Heritage Site—on green hydrogen to promote clean energy.
      • The CM emphasized that this initiative aligns with Himachal Pradesh’s goal of becoming a ‘green energy state’ by March 31, 2026.

    About the Kalka-Shimla Railway

    • The Kalka-Shimla Railway is a narrow-gauge railway with a width of 2 ft 6 in (762 mm).
    • It was constructed in 1898 to link Shimla with the broader Indian rail system under the guidance of chief engineer H. S. Harington.
    • The total length of the railway is approximately 96.6 km.
    • This engineering marvel features 107 tunnels, of which 102 are still in use, along with 864 bridges along its route.
    • The railway has a ruling gradient of 1 in 33 (about 3%), making it quite a steep climb in places, and it includes 919 curves, with the sharpest curve being at 48 degrees.
    • The elevation of the railway starts at 656 meters (2,152 feet) in Kalka and rises to 2,076 meters (6,811 feet) in Shimla, resulting in a height difference of 1,420 meters (4,660 feet).
    • Diesel locomotives began operation on the railway in 1955, followed by diesel-hydraulic models introduced in 1970.
    • On 8 July 2008, it was designated as a UNESCO World Heritage Site as part of the Mountain Railways of India.

    Note:

    • Three of the lines, the Darjeeling Himalayan Railway, the Nilgiri Mountain Railway, and the Kalka–Shimla Railway, are collectively designated as a UNESCO World Heritage Site under the name “Mountain Railways of India”.
    • Two more, the Matheran Hill Railway and the Kangra Valley Railway, are on the tentative list of UNESCO World Heritage Sites.
    • The Nilgiri Mountain Railway is also the only rack and pinion railway in India.

     

    PYQ:

    [2015] With reference to bio-toilets used by the Indian Railways, consider the following statements:

    1. The decomposition of human waste in the bio toilets is initiated by a fungal inoculum.

    2. Ammonia and water vapour are the only end products in this decomposition which are released into the atmosphere.

    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

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  • Tribes in News

    Manipur’s non-Naga Thadou community lends support to NRC

    Prelims Only | Indian Society | Mains Paper 1: Salient features of Indian Society

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Thadou Tribe

    Why in the News?

    The Thadou tribe, one of the oldest and largest non-Naga tribes in Manipur, has expressed support to implement the National Register of Citizens (NRC) in the state.

    About the Thadou Community

    Details
    Overview
    • One of the oldest indigenous tribes in Manipur, recognized as a distinct community.
    • One of 29 officially recognized indigenous tribes in Manipur with rich cultural practices and folklore.
    Historical Background Recognized as the largest tribe in Manipur since the First Census of India (1881), with a distinct historical narrative from Kukis.
    ST Recognition Acknowledged as an independent Scheduled Tribe under the 1956 Presidential Order.
    Population  As per the 2011 Census, the Thadou population stands at 2,15,913;
    Identity Asserts a distinct identity from the Kuki community, emphasizing unique language, culture, and history.
    Language Belongs to the Tibeto-Burman family, with a distinct dialect from other nearby tribes.
    Geographic Distribution Primarily located in Manipur; also present in Nagaland, Assam and Mizoram, inhabiting hilly regions.
    Socioeconomic Status Engaged in agriculture (particularly jhum cultivation) and knowledgeable about medicinal plants; faces challenges in infrastructure and education.
    Religious Practices Traditionally practiced animism; many have converted to Christianity, blending traditional and Christian customs.
    Position Amid Ethnic Conflict Affected by the ethnic conflict between Meitei and Kuki-Zo communities since May 3, 2023; asserts their distinct identity.

     

    PYQ:

    [2013] Consider the following pairs :

    Tribe: State

    1. Limboo Limbu : Sikkim

    2. Karbi : Himachal

    3. Dongaria Kondh : Odisha

    4. Bonda : Tamil Nadu

    Which of the above pairs are correctly matched?

    (a) 1 and 3 only

    (b) 2 and 4 only

    (c) 1, 3 and 4 only

    (d) 1, 2, 3 and 4

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  • Innovations in Biotechnology and Medical Sciences

    The Gompertz Model

    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: Gompertz Model

    Why in the News?

    Indian researchers have developed a predictive model based on the Gompertz Model to estimate a newborn’s birth weight using routine pregnancy scans.

    What is the Gompertz Model?

    • It is a mathematical model developed by English mathematician Benjamin Gompertz in the early 19th century.
      • It was originally designed to model population growth in a constrained environment, such as a specific geographic region.
      • The model uses an S-shaped (sigmoid) curve to represent growth patterns that start slowly, accelerate, and then slow again as they approach a plateau.
    • Applications:
      • Biology: The Gompertz Model is used to study tumor growth and cell population dynamics, reflecting constrained growth in biological systems.
      • Epidemiology: Applied in predicting the spread of infectious diseases like COVID-19, capturing how transmission rates slow with interventions.
      • Ecology: Useful for modelling species population growth in habitats with limited resources, aiding conservation and ecosystem management.
      • Healthcare: Recently adapted to predict foetal birth weight, helping identify potential risks associated with low or high birth weight.
      • Aging Research: Employed to analyze mortality rates and lifespan patterns, contributing to studies on aging and longevity.

    Recent Research and Significance

    • Recent research has applied the Gompertz Model in predicting foetal birth weight using routine scans, as shown by researchers from IISER Pune and IMSc Chennai, offering a non-invasive alternative for maternal health.
    • The model is used in tumor growth studies, allowing researchers to understand and predict cancer progression.
    • Its predictive accuracy under constrained conditions makes it useful for biological systems, including population growth and cell dynamics.
    • In healthcare, it supports early detection and intervention for conditions impacted by growth patterns, such as low or high birth weight risks.

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  • Climate Change Impact on India and World – International Reports, Key Observations, etc.

    Glacial Lakes rise as glaciers retreat

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Glacial Lakes

    Why in the News?

    Since 1977, the South Lhonak Lake, a glacial lake in Sikkim has expanded significantly, growing from 17 hectares to 167 hectares by 2023.

    Formation of Glacial Lakes:

    • When a glacier melts and retreats, the hollow left behind often fills with water, creating a glacial lake.
    • The rocky moraine at the glacier’s end can act as a natural dam, holding the water to form the lake.
    • Glacial lakes act as hydrological buffers, regulating water flow from melting ice, which can sometimes pose challenges to downstream communities.
    • Glacial lakes often have a vivid blue color, similar to swimming pools, due to the scattering of light by fine rock particles (rock flour) in the water.
    • There are several types of glacial lakes, each formed by specific processes and glacier dynamics:
      • Moraine-Dammed Lakes: Formed when moraine debris piles up at the end of a glacier and traps meltwater behind it. These are common and pose risks of outburst flooding.
      • Kettle Lakes: This was created when a chunk of glacier ice is buried in the moraine and eventually melts, leaving a depression filled with water.
      • Cirque Lakes: Formed in circular basins (cirques) carved by glaciers at high elevations. These lakes are often small and located at the glacier’s original head.
      • Pro-glacial Lakes: Situated in front of the glacier, between the ice and the moraine dam. These lakes are sometimes formed when the glacier’s snout melts and deposits water in the valley.
      • Tarn Lakes: Formed in depressions left behind in the cirques or basins after the glacier has completely melted.

    Major Glacial Lakes in India

    India’s Himalayan region is home to numerous glacial lakes, each with unique characteristics:

    • Gurudongmar Lake (Sikkim): One of the highest lakes in the world at 5,430 meters above sea level, fed by glacial melt and known for its religious significance.
    • Chandra Taal (Himachal Pradesh): A stunning crescent-shaped lake in the Lahaul-Spiti region at 4,300 meters. It is surrounded by snow-capped mountains and fed by glacier melt.
    • Samiti Lake (Sikkim): Located along the trek to Kanchenjunga and known for its clear blue waters and reflective quality.
    • Satopanth Tal (Uttarakhand): Found in the Garhwal Himalayas, this lake lies close to Satopanth Glacier and is considered sacred by locals.
    • South Lhonak Lake (Sikkim): A growing lake fed by three glaciers, expanding rapidly due to climate change and posing risks of glacial lake outburst floods.

    PYQ:

    [2019]  Consider the following pairs:

    Glacier: River

    1. Bandarpunch: Yamuna
    2. Bara Shigri: Chenab
    3. Milam: Mandakini
    4. Siachen: Nubra
    5. Zemu: Manas

    Which of the pairs given above are correctly matched?
    (a) 1, 2 and 4 only
    (b) 1, 3 and 4 only
    (c) 2 and 5 only
    (d) 3 and 5 only

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