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Type: Prelims Only

  • Mosquitofish: India’s Battle against Invasive Species

    Mosquitofish

    Central Idea

    • In recent months, Indian states such as Andhra Pradesh, Odisha, and Punjab have introduced mosquitofish to combat mosquito infestations.
    • However, the unintended ecological consequences of introducing this invasive species have raised concerns.

    Backgrounder: Vector Borne Diseases

    • Global Mosquito-Borne Disease Prevalence: Mosquito-borne diseases affect over 150 countries and 500 million people worldwide.
    • India’s Burden: India alone reports approximately 40 million cases of mosquito-borne diseases annually.

    What is Mosquitofish?

    • Introduction in the 1960s: In the 1960s, biological control methods were adopted to combat mosquitoes, including the introduction of mosquitofish (Gambusia species).
    • Environmental Alternatives: These methods were considered environmentally friendly alternatives to chemical pesticides, which posed health and environmental risks.
    • Global Proliferation: Mosquitofish, originally from the U.S., have now become widespread globally, adapting to various environments with adverse ecological impacts.

    Mosquitofish in India

    • Historical Introduction: In 1928, Gambusia was introduced in India during British rule, mainly for malaria control.
    • Multiple Authorities Involved: Various governmental and private organizations, including the Indian Council of Medical Research (ICMR), National Institute of Malaria Research (NIMR), municipal corporations, and health departments, introduced mosquitofish across India.

    Ecological Impact

    • Invasive Alien Species: Mosquitofish are considered among the hundred most detrimental invasive alien species.
    • Negative Effects: They prey on native fauna, leading to the extinction of native fish, amphibians, and freshwater communities.
    • Examples from Other Countries: Australia and New Zealand have reported similar ecological harm due to introduced mosquitofish.
    • WHO’s Stand: The World Health Organization stopped recommending Gambusia for mosquito control since 1982.

    Current Situation and Recommendations

    • Enforcement Measures: Stringent enforcement measures are essential to prevent further introduction of mosquitofish and mitigate past introductions’ consequences.
    • Alternative Solutions: Collaboration between mosquito biologists, entomologists, invasion ecologists, and fish taxonomists is suggested to identify native fish species capable of controlling mosquito larvae.
    • Local Solutions: Local alternatives should be favored over invasive species to preserve indigenous aquatic biodiversity and native species’ well-being.
    • National Centre for Vector Borne Diseases Control (NCVBDC): The NCVBDC should remove its recommendation for the use of Gambusia and Poecilia (guppy) fishes for mosquito control.

    Conclusion

    • India faces a pressing ecological challenge with the unintended consequences of mosquitofish introduction.
    • To safeguard the environment and native species, stringent enforcement and local solutions should replace invasive species in mosquito control efforts.

  • NASA’s AWE Mission: Linking Earth’s and Space Weather

    AWE Mission

    Central Idea

    • NASA is set to launch the Atmospheric Waves Experiment (AWE) to investigate how Earth’s weather influences Space weather.

    What is AWE Mission?

    • As part of NASA’s Heliophysics Explorers Program, the AWE mission aims to shed light on the interactions between Earth’s weather and Space weather.
    • Mounted on the International Space Station (ISS), AWE will observe Earth’s airglow bands from an exceptional viewpoint.
    • AWE will analyze airglow in the mesopause region (about 85-87 km above Earth) to understand AGW behavior and its influence on Space weather.
    • The mission includes the Advanced Mesospheric Temperature Mapper (ATMT) to precisely map temperature variations in the mesopause, revealing airglow dynamics.

    Space Weather Explained

    • Space weather, much like Earth’s weather, is influenced by solar activities like flares and emissions, and it impacts the surrounding cosmic environment.
    • Variations in Space weather can disrupt essential services on Earth, including satellite communications, GPS systems, and power grids.
    • Interestingly, Earth’s own weather conditions also significantly affect Space weather, creating a complex interplay between our planet and the cosmos.

    How do Atmospheric Gravity Waves (AGWs) impact space weather?

    • Nature’s Oscillations: AGWs are similar to ripples caused by a stone thrown into a pond. They are vertical waves generated by sudden atmospheric changes or extreme weather, causing air to move up and down.
    • Various Sources: AGWs originate from events like thunderstorms and hurricanes, and they travel from the lower atmosphere to Space, influencing Space weather.
    • Thriving in Stability: AGWs are most prominent in stable atmospheric conditions, where they create wave-like patterns due to temperature differences in rising air.
    • Vital Atmospheric Profiling: To fully understand AGWs and their impact on terrestrial and Space weather, detailed data on the atmosphere’s vertical profile is essential.

  • Understanding Eclipses: Why they don’t happen every Month

    Eclipse

    Central Idea

    • While Eclipses are intriguing, one might wonder why eclipses do not occur with every new and full moon.

    What are Eclipses?

    • Eclipses are astronomical events that occur when the sun, moon, and Earth align in specific ways.
    • There are two primary types of eclipses: solar and lunar.
    • A solar eclipse happens when the moon comes between the sun and Earth during a new moon, blocking out the sun’s light.
    • Conversely, a lunar eclipse occurs when the Earth is positioned between the sun and the moon during a full moon, casting a shadow on the moon.

    Visit this page to read more about Eclipses:

    What are Eclipses?

    Why is there no eclipse every full and new moon?

    Ans. Moon’s Unique Orbit

    • Moon’s Path: The moon orbits around Earth, completing one orbit roughly every month.
    • Ecliptic Plane: In an ideal scenario, if the moon’s orbit matched Earth’s orbital plane, called the ecliptic, we would witness a solar eclipse during every new moon and a lunar eclipse during every full moon.
    • Moon’s Inclination: However, the moon’s orbit is inclined at an angle of about 5 degrees to Earth’s orbital plane, causing irregular eclipse patterns.

    Role of Lunar Nodes

    • Lunar Nodes: The moon’s orbit intersects Earth’s orbital plane at specific points known as nodes, categorized as ascending or descending nodes depending on the moon’s orbital direction.
    • Eclipse Occurrence: Eclipses happen when a full or new moon closely aligns with one of these nodes, ensuring the sun, moon, and Earth are in alignment.

    Eclipse Pairs and Seasons

    • Eclipse Pairs: Solar and lunar eclipses typically occur in pairs, with one following the other within a two-week period.
    • Eclipse Seasons: Eclipse seasons, lasting around 34 to 35 days, usually feature two eclipses – one solar and one lunar. Occasionally, three eclipses may occur in a single season.
    • Frequency: Contrary to common perception, there are more eclipses than expected, with the 21st century witnessing 224 solar eclipses and 230 lunar eclipses.

    Understanding the Lunar Nodes and Eclipses

    • Eclipse Seasons: Eclipse seasons take place approximately every 173 days when the lunar nodes precisely align with the Earth and the sun.
    • Moon’s Progression: The moon’s phases shift about 30 degrees along the zodiac every month concerning the nodes.
    • Future Eclipses: After a pair of eclipses, the next pair usually occurs nearly 6 calendar months later.

  • Exercise ‘Vajra Prahar 2023’ Commences in Meghalaya

    Central Idea

    • Recently, the 14th edition of the Vajra Prahar 2023 exercise, a joint venture between India and the USA Special Forces, concluded in Bakloh, Himachal Pradesh. Here are the key highlights:

    Exercise Vajra Prahar

    • Vajra Prahar is an annual exercise alternately hosted by the Special Forces of India and the United States.
    • These Special Forces units are dedicated to covert operations, counterterrorism, and other specialized military tasks.
    • It is crucial for addressing the security challenges both nations face in the current global context.
    • It has reinforced the friendship and defence cooperation between the Special Forces of India and the USA.

    Objectives

    • The 21-day joint exercise aimed to enhance skills in Airborne Operations, Special Operations, and Counter Terrorism under the United Nations Charter.
    • It was divided into two stages:
      1. The initial stage focused on combat conditioning and tactical special mission training.
      2. The second stage involved a 48-hour validation exercise to assess the training received in the first phase.

    Other Joint Exercises between India and the USA

    • Yudh Abhyas: Annual army exercise focusing on enhancing military cooperation and understanding.
    • Malabar Exercise: Naval exercise, also including Japan and Australia, focusing on complex maritime operations.
    • Cope India: Air force exercise aimed at improving interoperability and mutual understanding between air forces.
    • Tiger Triumph: Tri-service amphibious exercise focusing on humanitarian assistance and disaster relief.
    • Red Flag: Advanced aerial combat training exercise involving the U.S. Air Force and international participants, including India.
    • Spartan Shield: Army exercise aimed at building operational capacity in counter-insurgency and counter-terrorism.

  • Gamma-Ray Burst in faraway Galaxy disturbed Earth’s Ionosphere

    Central Idea

    • A Star’s Explosive End: About two billion years ago, far beyond our Milky Way galaxy, a huge star exploded into a supernova. This explosion sent out a massive burst of gamma rays, the most powerful type of energy wave in the electromagnetic spectrum.
    • Gamma-Ray Bursts: These bursts are short-lived but incredibly intense, often associated with the most dramatic events in the universe, like the death of massive stars.

    Why discuss this?

    • These gamma rays travelled across space for billions of years, finally reaching Earth in 2022.
    • When they arrived, they caused a significant disturbance in Earth’s ionosphere, a layer of electrically charged gases high in our atmosphere.

    What are Gamma-Ray Bursts?

    • What Are They? Gamma-ray bursts (GRBs) are incredibly intense flashes of gamma rays, which are the most energetic form of light in the electromagnetic spectrum. These bursts are the most powerful explosions observed in the universe.
    • How They Occur: They usually happen when massive stars collapse into neutron stars or black holes, or during the merger of neutron stars. These cosmic catastrophes release a tremendous amount of energy.
    • Duration and Energy: GRBs can last from a few milliseconds to several hours, but they typically last a few seconds. The amount of energy released in this short time can be more than the Sun will emit in its entire 10-billion-year lifetime.
    • Afterglow: Following the initial burst, GRBs are often followed by an ‘afterglow’ emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, and radio).

    Earthly Consequences and Research

    • Lasting Effects: The gamma rays disturbed the ionosphere for several hours and even set off lightning detectors in India.
    • Scientific Importance: Although this burst didn’t harm life on Earth, it showed how sensitive our ionosphere is to space events.
    • A Rare Event: Such a powerful gamma-ray burst is expected to hit Earth only once every 10,000 years.

    Looking Ahead: Protecting Earth from Cosmic Threats

    • Preparing for Future Events: Scientists are studying the potential risks of a similar event happening closer to Earth, within our own Milky Way.
    • Low Risk: However, the chance of such a dangerous event happening is very low.

  • Langlands Program: Making Complex Math Connections Easier to Understand

    Central Idea

    • Robert Langlands, a mathematician famous for his “Langlands Program,” has shifted his focus to Turkish literature in his later years.
    • This program is about finding deep links between two areas of math: number theory (the study of numbers) and harmonic analysis (a type of math that breaks down functions or signals into simpler parts).

    Langlands Program: A Journey to Connect Different Math Areas

    • Beginning: In 1967, Robert Langlands, a young mathematician at Princeton, started this journey with a letter to another mathematician, Andre Weil, sharing some groundbreaking ideas.
    • Complex Ideas: The program is full of complicated ideas that are hard for even experts to fully understand.
    • Goal: It aims to connect number theory and harmonic analysis, two areas of math that don’t seem related at first.

    The Purpose of the Program

    • Abel’s Discovery: In 1824, Niels Henrik Abel showed that it’s impossible to find a one-size-fits-all solution for certain math equations (polynomial equations) beyond a certain complexity.
    • Galois’s Approach: Evariste Galois, who didn’t know about Abel’s work, suggested looking at patterns (symmetries) in the solutions of these equations instead of trying to solve them directly.
    • Galois Groups: These are groups that show the patterns in the solutions of these equations and are key to the Langlands Program.
    • Linking Ideas: The program tries to connect these Galois groups with something called automorphic functions, which would allow using calculus (a branch of math) to explore these equations, connecting harmonic analysis and number theory.

    Automorphic Functions: Connecting Different Areas of Math

    • Example of Automorphic Function: Think of functions that have a repeating pattern, like the way sine functions in trigonometry work.
    • Special Symmetry: Automorphic functions have a unique property where they remain the same even after certain transformations, showing a special kind of symmetry.
    • Role in Langlands Program: The program’s goal is to link these special functions with Galois groups, leading to new ways of understanding and solving math problems.

    Impact of the Program

    • Solving an Old Puzzle: In 1994, Andrew Wiles and Richard Taylor used ideas from the Langlands Program to solve Fermat’s Last Theorem, a famous and old math problem.
    • Creating New Functions: This program helps in making new types of automorphic functions, which could help solve other complex math problems, like the Ramanujan conjectures.
    • Geometric Langlands: This is a branch of the Langlands Program that looks at connections between different fields like algebraic geometry, representation theory, and even physics.
    • Math and Physics Connection: Recent studies suggest that this program might help in understanding things in physics, like the study of electromagnetic waves.

  • Freemartins in Animal Husbandry

    Central Idea

    • In the realm of animal husbandry, a phenomenon known as Freemartinism sheds light on the extraordinary diversity found in cattle.

    Freemartinism: A Unique Phenomenon

    • Freemartins are sterile female cattle born exhibiting characteristics of both sexes.
    • This phenomenon arises when a male and a female twin develop within the same uterus, occurring in approximately 90% of twin pregnancies in cattle.
    • The exchange of blood between the male and female foetuses during gestation plays a pivotal role in Freemartinism.
    • Freemartinism is primarily attributed to the sharing of cells carrying the Y chromosome from the male twin with the female twin.
    • Y chromosome triggers the development of male reproductive organs in the male foetus, while the female foetus, influenced by male hormones, undergoes incomplete development of its reproductive system.
    • Freemartins possess underdeveloped or non-functional reproductive tracts, rendering them incapable of reproduction.

    Agricultural Significance

    • In agricultural settings, identifying freemartins is crucial to enhance reproductive efficiency in cattle breeding.
    • Farmers often utilize physical and behavioural traits to identify freemartins, subsequently removing them from the breeding herd.
    • This culling strategy helps improve the overall breeding program by ensuring that non-reproductive cattle do not contribute to the herd.

  • Who was Lachit Borphukan?

    Lachit Borphukan

    Central Idea

    • An animation film on an iconic Ahom general Lachit Borphukan has been selected for the International Film Festival of India (IFFI) 2023 to be held in Goa.

    Lachit Borphukan

    • Lachit Borphukan was a legendary military commander from the northeastern region of India, specifically from the state of Assam. Here are some facts related to him:
    Description
    Timeline 1622-1672
    Dynasty Ahom Dynasty
    Mughal Threat Faced the Mughal Empire’s expansion into Assam
    Battle of Saraighat Led Ahom forces to victory against the Mughals in 1671

    Defended Assam against the Aurangzeb’s forces led by Ram Singh
    Leadership Known for strategic brilliance and guerrilla tactics
    Legacy Revered as a symbol of Assamese pride and resistance
    INS Lachit Indian Navy’s guided-missile destroyer named in honor
    Lachit Divas Celebrated annually on November 24th in Assam

     

    https://www.thehindu.com/news/national/other-states/assam-ips-officer-directed-animation-film-chosen-for-iffi-2023/article67550668.ece

     

  • Cultivation of GI-tagged Onattukara Sesame

    Onattukara Sesame

    Context

    • Kerala is taking efforts to expand the cultivation of Geographical Indication (GI)-tagged Onattukara sesame, a unique and valuable agricultural product.
    • Onattukara sesame was granted the GI tag in January this year.

    Onattukara Sesame (Ellu )

    Description

    Region of Cultivation

    		 Primarily cultivated in the Onattukara region, covering Alappuzha, Kollam, and Pathanamthitta districts in Kerala, India.
    Medicinal Properties Onattukara sesame is known for its medicinal properties and high quality.
    Traditional Use Traditional ayurvedic doctors in the region have used Onattukara sesame oil for treating rheumatism and skin protection since the 18th century.
    Nutritional Value Rich in vitamin E and antioxidants. Contains essential fatty acids like oleic acid, linoleic acid, and palmitoleic acid.
    Varieties Grown in various varieties, including ‘ayali,’ Kayamkulam-1, thilak, thilathara, and thilarani, developed by ORARS, Kayamkulam.
    Market Potential Obtaining the GI tag is expected to increase its popularity and market value, leading to higher prices for sesame seeds and oil.
    Pricing Current prices: Sesame seeds – ₹200 to ₹250 per kilogram, Sesame oil – ₹500 to ₹600 per kilogram.

  • GI tag for Sea Buckthorn

    Sea Buckthorn

    Central Idea

    • The Geographical Indication Registry has officially granted the GI tag to ‘Ladakh Sea Buckthorn’.
    • It is the fourth GI tag after Apricot (Raktsey Karpo), Pashmina, and Ladakhi Wood Carving in Ladakh.

    About Sea Buckthorn

    • Sea buckthorn is a plant that grows in Europe and Asia.
    • In India, it’s found in the Himalayan region, especially in dry places like the cold deserts of Ladakh and Spiti.
    • This plant produces small orange or yellow berries that are sour but full of vitamins, especially vitamin C.
    • It can survive really hot and really cold temperatures, which makes it perfect for the cold deserts.
    • Every part of the plant—berries, leaves, twigs, roots, and thorns—are useful for medicine, food, fuel, and fencing.
    • It’s also a vital food source for many birds and provides nutritious food for animals like sheep, goats, donkeys, cattle, and camels in the cold desert regions.
    • It is often called the ‘Wonder Plant,’ ‘Ladakh Gold,’ ‘Golden Bush,’ or ‘Gold Mine’ of the cold deserts.

    Back2Basics: GI Tag

    • A GI is a sign used on products that have a specific geographical origin and possess qualities or a reputation that are due to that origin.
    • Nodal Agency: Department for Promotion of Industry and Internal Trade (DPIIT), Ministry of Commerce and Industry
    • India, as a member of the World Trade Organization (WTO), enacted the Geographical Indications of Goods (Registration and Protection) Act, 1999 w.e.f. September 2003.
    • GIs have been defined under Article 22 (1) of the WTO Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPS) Agreement.
    • The tag stands valid for 10 years.