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Type: Prelims Only

  • ISRO Missions and Discoveries

    [pib] Formation of Blue Straggler

    Prelims Only | Science Tech | Mains Paper 3: Conservation, Environmental Pollution & Degradation, Eia

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Blue Stragglers

    Mains level: Not Much

    Carrying out the first-ever comprehensive analysis of blue stragglers, Indian researchers found that half of the blue stragglers in their sample are formed through mass transfer from a close binary companion star.

    What are Blue Stragglers?

    • A blue straggler is a main-sequence star in an open or globular cluster that is more luminous and bluer than stars at the main sequence turnoff point for the cluster.
    • The most likely explanation is that blue stragglers are the result of stars that come too close to another star or similar mass object and collide.
    • The newly-formed star has thus a higher mass and occupies a position on the HR diagram which would be populated by genuinely young stars.
    • One-third of them are likely formed through collisions of 2 stars, and the remaining are formed through interactions of more than 2 stars.

    How are they formed?

    • A bunch of stars born at the same time from the same cloud form a star cluster.
    • As time passes, each star evolves differently depending on its mass.
    • The most massive and bright stars evolve and move off the main sequence creating a bend in their track, known as the turnoff.
    • Stars above this bend or brighter and hotter stars are not expected in a cluster, as they leave the main sequence to become red giants.
    • But in 1953, Allan Sandage found that some stars seem to be hotter than the turnoff of the parent cluster.

    Behind the nomenclature

    • Initially, these blue stars still straggling above the turnoff were not part of these clusters.
    • However, later studies confirmed that these stars are indeed cluster members, and they were termed “Blue Stragglers”.
    • The only probable way these stars can still be present in these clusters is if they have somehow acquired extra mass along the way while on the main sequence.
    • Confirming the mechanisms of the mass gain required a study using a large sample of blue-straggler stars and estimates of the mass they have gained.

    What have Indian researchers found?

    • Research showed that these stars are primarily present in the older and massive star clusters. And due to their large mass, they are segregated towards the centre of the clusters.
    • The researchers compared the mass of the blue stragglers to the mass of the turnoff stars (which are the most massive ‘normal’ stars in the cluster) and predicted the formation mechanisms.
    • The study will help improve understanding of these stellar systems to uncover exciting results in studies of large stellar populations, including galaxies.
    • Following these findings, the researchers are conducting detailed analyses of individual blue stragglers in the catalog to obtain their stellar properties.

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  • Wildlife Conservation Efforts

    Behler Turtle Conservation Award

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Species mentioned, Turtle Survival Alliance (TSA)

    Mains level: NA

    Indian biologist Shailendra Singh has been awarded the Behler Turtle Conservation Award for bringing three critically endangered turtle conservation species back from the brink of extinction.

    Behler Turtle Conservation Award

    • The Award is a major annual international award honoring excellence in the field of tortoise and freshwater turtle conservation and biology, and leadership in the chelonian conservation and biology community.
    • It is co-presented by the Turtle Survival Alliance (TSA), the IUCN/SSC Tortoise and Freshwater Turtle Specialist Group (TFTSG) among others.
    • It is widely considered the “Nobel Prize” of turtle conservation and biology.

    Citation for the 2021 Award

    • For some species, such as the Red-crowned Roofed Turtle (Batagur kachuga), Northern River Terrapin (Batagur Baska), and Black Softshell Turtle (Nilssonia nigricans) Dr. Singh and his team’s efforts are the last hope for their wild survival in the country.
    • In just 15 years, there are few individuals that have made such monumental contributions to turtle conservation.

    Turtles in India

    • The Northern River Terrapin (Batagur Baska) is being conserved at the Sunderbans; the Red-crowned Roofed Turtle (Batagur kachuga) at Chambal; and the Black Softshell Turtle (Nilssonia nigricans) at different temples in Assam.
    • These critically endangered turtles are being conserved as a part of TSA India’s research, conservation breeding and education programme in different parts of the country.
    • There are 29 species of freshwater turtles and tortoises in the country.

    About Turtle Survival Alliance (TSA)

    • The TSA was formed in 2001 as an International Union for Conservation of Nature (IUCN) partnership for sustainable captive management of freshwater turtles and tortoises.
    • This alliance arose in response to the rampant and unsustainable harvest of Asian turtle populations to supply Chinese markets, a situation known as the Asian Turtle Crisis.

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  • Contention over South China Sea

    China’s new Maritime Law

    Prelims Only | International Relations | Mains Paper 2: Bilateral, Regional and Global Groupings and agreements involving India

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: South China Sea

    Mains level: South China Sea Dispute

    China’s new maritime rules designed to control the entry of foreign vessels in what Beijing calls “Chinese territorial waters” take effect.

    What is the new Maritime Law?

    • Foreign vessels, both military and commercial, will be henceforth required to submit to Chinese supervision in “Chinese territorial waters,” as per the new law.
    • Operators of submersibles, nuclear vessels, ships carrying radioactive materials, and ships carrying bulk oil, chemicals, liquefied gas, and other toxic and harmful substances are required to report their detailed information upon their visits to Chinese territorial waters.
    • Vessels that “endanger the maritime traffic safety of China” will be required to report their name, call sign, current position and next port of call, and estimated time of arrival.
    • The name of shipborne dangerous goods and cargo deadweight will also be required.

    Impact of the move

    • The move is expected to have far-reaching consequences for the passage of vessels, both commercial and military, in the disputed South China Sea, East China Sea, and Taiwan Strait.
    • It is likely to escalate the existing tension with the US and its neighbors in the region.

    Why is this important?

    • South China Sea: The South China Sea, which lies between China, Taiwan, the Philippines, Brunei, Malaysia, Indonesia, and Vietnam, is of great economic importance globally.
    • Shipping: Nearly one-third of the world’s shipping passes through its lanes, and the waters house numerous important fisheries.

    Significance for India

    • The South China Sea is a critical route for India, both militarily and commercially.
    • It plays a vital role in facilitating India’s trade with Japan, South Korea, and ASEAN countries, and assists in the efficient procurement of energy supplies.
    • More than 55% of India’s trade passes through the South China Sea and Malacca Straits.
    • India is also involved in oil and gas exploration in offshore blocks in the margins of the Sea, which has led to standoffs with Chinese authorities.

    The actual row

    • The waters around China are hotly contested.
    • Under a “nine-dash line” map, China claims most of the South China Sea as its sovereign territory.
    • This claim is contested by its neighbors in the region and by the United States, which, though it has no claim in the Sea, backs the smaller nations in the fight against Chinese overreach.

    International position

    • Currently, international maritime activities are governed by an international agreement called the United Nations Convention on the Law of the Sea (UNCLOS).
    • China, India, and over a hundred other countries are signatories of UNCLOS (the US, significantly, is not).
    • Accordingly, states have the right to implement territorial rights up to 12 nautical miles into the sea.
    • The UNCLOS also states that all vessels have the right of “innocent passage” through this region – China’s new law violates this.

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  • Coal and Mining Sector

    Govt. tells utilities to ship in coal as demand surges

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Coal mining in India

    Mains level: Need for coal imports

    The govt. has urged utilities to import coal despite having the world’s fourth-largest reserves, with several power plants on the verge of running out of fuel due to a surge in power demand.

    Coal Mining in India

    • Coal in India has been mined since 1774 and is now the second fastest mined in the world, producing 716 million metric tons (789 million short tons) in 2018.
    • Due to high demand and poor average quality, India imports coking coal to meet the requirements of its steel plants.
    • Dhanbad city is the largest coal-producing city and is called the Coal Capital of India.
    • State-owned Coal India had a monopoly on coal mining between its nationalization in 1973 and 2018.

    Consumption

    • Coal-fired power accounts for more than 70% of India’s electricity generation. Electricity generation makes up three-fourths of India’s coal consumption.

    Quality of coal

    • The ash chemistry of Indian coal is such that it is high in silica and alumina.
    • The ash is also highly abrasive because of its high quartz content, which can lead to erosion of the syngas cooling system when it gets fused.
    • Indian coal’s sulfur content is low, about 0.5 percent.
    • So, from a gas clean-up perspective, the flue gas desulphurization (removal of SOx gases) and NOx removal system is not economically justifiable and, therefore, not important.
    • Also, in the Indian context, this is unnecessary to meet emission norms.

    Coal reserves

    • India has the fourth-largest coal reserves in the world. It is the second-largest producer of coal in the world, after China.
    • Coal deposits are primarily found in eastern and south-central India.
    • Jharkhand, Odisha, Chhattisgarh, West Bengal, Madhya Pradesh, Telangana, and Maharashtra accounted for 98.09% of the total known coal reserves in India.
    • As of 31 March 2019, Jharkhand and Odisha had the largest coal deposits of 25.88% and 24.76% respectively.

    Imports

    • Coking Coal is being imported by the Steel Authority of India Limited (SAIL) and other Steel manufacturing units mainly to bridge the gap between the requirement and indigenous availability and to improve the quality.
    • Coal-based power plants, cement plants, captive power plants, sponge iron plants, industrial consumers, and coal traders are importing non-coking coal.
    • Coke is imported mainly by Pig-Iron manufacturers and Iron & Steel sector consumers using mini-blast furnaces.

    Try answering this PYQ:

    Which of the following is/are the characteristics/ characteristics of Indian coal?

    1. High ash content
    2. Low Sulphur content
    3. Low ash fusion temperature

    Select the correct option using the codes given below:

    (a) 1 and 2 only

    (b) 2 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

     

    Post your answers here.

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  • Wildlife Conservation Efforts

    Ladakh adopts State Animal and Bird

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Snow leopard, black-necked crane

    Mains level: Not Much

    Ladakh has adopted two endangered species, snow leopard and black-necked crane, as State animal and State bird, two years after it was carved out as a separate Union Territory (UT) from the erstwhile State of J&K.

    Snow Leopard

    • The snow leopard (Panther unica) and black-necked crane (Grus nicricollis).
    • Snow leopard, whose numbers are dwindling worldwide, has been categorized as “vulnerable” in the International Union for Conservation of Nature Red List.
    • In total, there are about 7,500 snow leopards left in the world, out of which 500 are in India.
    • However, experts state that the population of snow leopards is between 200-300 in Ladakh alone.

    Black-necked Crane

    • The black-necked crane is found in eastern Ladakh’s high-altitude wetlands and marshes.
    • It is mostly listed as Near Threatened on the International Union for Conservation of Nature (IUCN) red list.
    • Considered loyal couples, they are only found in Ladakh’s Changthang region. They arrive in March for breeding and migrate by October end or early November.
    • It was the State bird of J&K before August 5, 2019.

    About Ladakh

    • Ladakh was established as a union territory of India on 31 October 2019, following the passage of the Jammu and Kashmir Reorganization Act.
    • Prior to that, it was part of the Jammu and Kashmir state. Ladakh is the largest and the second least populous union territory of India.
    • It extends from the Siachen Glacier in the Karakoram range to the north to the main Great Himalayas to the south.
    • The eastern end, consisting of the uninhabited Aksai Chin plains, is claimed by the Indian Government as part of Ladakh and has been under Chinese control since 1962.
    • The largest town in Ladakh is Leh, followed by Kargil, each of which headquarters is a district.
    • The Leh district contains the Indus, Shyok and Nubra river valleys. The Kargil district contains the Suru, Dras and Zanskar river valleys.

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  • Indian Army Updates

    Exercise ZAPAD 2021

    Prelims Only | Security Issues | Mains Paper 3: Various Security Forces, Agencies & Their Mandates

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: ZAPAD 2021

    Mains level: Not Much

    A contingent of 200 Army personnel will participate in the multinational Exercise ZAPAD 2021 being held at Nizhniy, Russia.

    ZAPAD 2021

    • ZAPAD is one of the theatre-level exercises of Russian armed forces and will focus primarily on operations against terrorists.
    • The NAGA Battalion group participating in the exercise will feature an all arms combined task force.
    • The exercise aims to enhance military and strategic ties amongst the participating nations while they plan and execute this exercise.
    • In all, 17 countries have been invited by Russia for the exercise. Of these nine are Participating countries which include Mongolia, Armenia, Kazakhstan, Tajikistan, Kyrgyzstan, Serbia, Russia, India, and Belarus.
    • The other eight countries are Observers which include Pakistan, China, Vietnam, Malaysia, Bangladesh, Myanmar, Uzbekistan, and Sri Lanka.

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    Must read:

    [Prelims Spotlight] Various Defence Exercises in News

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  • Zoonotic Diseases: Medical Sciences Involved & Preventive Measures

    West Nile Virus outbreak in Russia

    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: West Nile Virus

    Mains level: NA

    Russia warned of a possible increase in West Nile virus infections this autumn as mild temperatures and heavy precipitation create favorable conditions for the mosquitos that carry it.

    West Nile virus (WNV)

    • WNV is mainly transmitted through mosquito bites and can lead to fatal neurological diseases in humans, although most people infected never develop any symptoms.
    • Cases of WNV occur during mosquito season, which starts in the summer and continues through fall.

    Its origin

    • Originally from Africa, the WNV has spread to Europe, Asia, and North America.
    • It was first isolated in a woman in the West Nile district of Uganda in 1937.
    • It was identified in birds in the Nile delta region in 1953.
    • Before 1997, WNV was not considered pathogenic for birds.
    • Human infections attributable to WNV have been reported in many countries for over 50 years.

    Symptoms

    • Infected persons usually have no symptoms or mild symptoms.
    • Some of the symptoms include fever, headache, body aches, skin rash, and swollen lymph glands.
    • They can last a few days to several weeks and usually, go away on their own.
    • Prolonged illness may cause inflammation of the brain, called encephalitis, or inflammation of the tissue that surrounds the brain and spinal cord, called meningitis.

    Treatment

    • There is no vaccine against the virus in humans although one exists for horses, the WHO says.

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  • Oil and Gas Sector – HELP, Open Acreage Policy, etc.

    Leaded Petrol is officially eradicated

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

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Leaded Petrol

    Mains level: Not Much

    The use of leaded petrol has been eradicated from the globe, a/c to the UN Environment Programme (UNEP).

    What is Leaded Petrol?

    • Tetraethyl-lead (TEL) is a petro-fuel additive, first being mixed with petrol beginning in the 1920s as a patented octane rating booster that allowed engine compression to be raised substantially.
    • This in turn caused increased vehicle performance and fuel economy.
    • The practice of adding tetraethyl lead to petrol had spread widely to all countries soon after its anti-knock and octane-boosting properties were discovered.
    • TEL is still used as an additive in some grades of aviation gasoline.

    Issues with leaded petrol

    • Lead is toxic, affects multiple body systems and is particularly harmful to young children.
    • It affects the brain, liver, kidneys, and bones. Lead is measured in the blood to understand exposure.
    • Lead in bone is released into the blood during pregnancy and becomes a source of exposure to the developing foetus.
    • More recent research has indicated that lead can damage the infant brain even at blood levels as low as 5 microunits per decilitre (μ/dl).

    India’s tryst with leaded petrol

    • India was among those countries that took early action to phase out leaded petrol. The process of phase down that had started in 1994, got completed in 2000.
    • Initially, low-leaded petrol was introduced in Delhi, Mumbai, Kolkata and Chennai in 1994, followed by unleaded petrol in 1995.
    • The entire country got low-leaded petrol in 1997 while leaded fuel was banned in the National Capital Territory of Delhi.
    • The final introduction of unleaded petrol in the entire country was mandated in April 2000.
    • This decision was also catalyzed by the Supreme Court order that had directed the introduction of unleaded petrol to enable the adoption of catalytic converters in petrol cars.

    Significance of phasing out

    • It is a milestone that will prevent more than 1.2 million premature deaths and save world economies over $2.4 trillion annually.
    • It has taken 100 years to stop the use of leaded fuel finally.

    Try answering this PYQ:

    Q.Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are the sources of lead poisoning? (CSP 2012)

    1. Smelting units
    2. Pens pencils
    3. Paints
    4. Hair oils and cosmetics

    Select the correct answer using the codes given below:

    (a) 1, 2 and 3 only

    (b) 1 and 3 only

    (c) 2 and 4 only

    (d) 1, 2, 3 and 4

     

    Post your answers here.

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  • Innovations in Biotechnology and Medical Sciences

    What is Milky Sea Phenomenon?

    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: Milky Sea Phenomenon

    Mains level: NA

    Some researchers would use satellites to study the elusive milky sea phenomenon.

    What is the Milky Sea?

    • Milky seas, also called mareel, is a luminous phenomenon in the ocean in which large areas of seawater appear to glow translucently (in varying shades of blue).
    • Such occurrences glow brightly enough at night to be visible from satellites orbiting Earth.
    • They are a rare nocturnal phenomenon in which the ocean’s surface emits a steady bright glow.

    Why do they glow?

    • Luminous bacteria cause the particles they colonize to glow.
    • The purpose of this glow could be to attract fish that eat them.
    • These bacteria thrive in the guts of fishes, so when their populations get too big for their main food supply, a fish’s stomach makes a great second option.

    How do they occur?

    • It is typically caused by Noctiluca scintillans (popularly known as “sea sparkle”), a dinoflagellate that glows when disturbed and is found in oceans throughout much of the world.
    • Once their population gets large enough – about 100 million individual cells per millilitre of water – a sort of internal biological switch is flipped and they all start glowing steadily.

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  • Modern Indian History-Events and Personalities

    PM inaugurates Jallianwala Bagh Memorial

    Prelims Only | | Mains Paper 1: Modern Indian History

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Jallianwala Bagh Massacre

    Mains level: Not Much

    Prime Minister has virtually inaugurated the renovated Jallianwala Bagh complex in Amritsar.

    What led to Jallianwala Bagh Massacre?

    Protesting the contentious Rowlatt Act

    • The act officially known as the Anarchical and Revolutionary Crimes Act, 1919 was passed in 1919 by the Imperial Legislative Council.
    • It had authorized the British government to arrest anybody suspected of terrorist activities.
    • It also authorized the government to detain such people arrested for up to 2 years without trial.
    • It empowered the police to search a place without a warrant. It also placed severe restrictions on the freedom of the press.
    • The primary intention of colonial govt. was to repress the growing nationalist movement in the country.
    • The British were also afraid of a Ghadarite revolution in Punjab and the rest of the country.

    The day

    • The massacre took place on 13 April 1919 when troops of the British Indian Army under the command of Col. Reginald Dyer fired rifles into a crowd of Indians.
    • The civilians had assembled for a peaceful protest to condemn the arrest and deportation of two national leaders, Satya Pal and Saifuddin Kitchlew.
    • Dyer without warning ordered his troops to fire at the unarmed crowd which included children as well.
    • The indiscriminate firing went on for about 10 minutes which resulted in the deaths of at least 1000 people and injured more than 1500 people.

    Aftermath

    • In protest against the massacre, Rabindranath Tagore gave up his knighthood.
    • Gandhiji relinquished his title ‘Kaiser-e-hind’ bestowed on him by the British for his services during the Boer War in South Africa.
    • Michael O’Dwyer, the then Lieutenant-Governor of Punjab, who had approved the actions of Dyer, was assassinated by Udham Singh in London in 1940 as revenge against the massacre.
    • The heroic treatment of Dyer’s heinous act again set a benchmark of colonial arrogance.

    Hunter Commission for inquiry

    • In October 1919 the Secretary of State for India, Edwin Montagu, ordered the formation of a committee of inquiry into the events in Punjab.
    • Referred to as the Disorders Inquiry Committee, it was later more widely known as the Hunter Commission (Not to be confused with Hunter Education Commission).
    • Still, there are long-standing demands in India that Britain should apologize for the massacre.

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