DAILY CURRENT AFFAIRS IAS | UPSC Prelims and Mains Exam – 31st March 2023
Archives (PRELIMS & MAINS Focus) COVID-19 Syllabus Prelims –Science and technology Context: Recently, Delhi reported an uptick in COVID-19 cases, compelling the health department to hold an emergency meeting. About COVID-19:- Covid-19 is spread via airborne droplets (sneezing coughing) or contact with the surface. The incubation period (interval between being infected and showing symptoms) is not very accurately known. Coronavirus is also known as COVID-19. This disease is caused by Severe Acute Respiratory Syndrome Coronavirus(SARS-CoV-2). It is an infectious disease that spreads from person to person. Structure:- IMAGE SOURCE: Trending Clinical Topic: COVID-19 (medscape.com) The outer layer of this virus is covered with spike-like proteins which surround it like a crown, thus named COVID. COVID-19 Diagnostic tests:- Viral tests: Mainly laboratory tests done by doctors. Antibody test:– It is a kind of blood test that determines the body’s status before exposure to COVID-19 and the body’s antibody stamina. The body takes 12 days to make enough antibodies to get identified in a test. Important Variants:- IMAGE SOURCE: What is a variant? An expert explains | News | Wellcome Over time, the virus may start to differ slightly in terms of its genetic sequence. These changes to the viral genetic sequence during this process are known as Viruses with new mutations are sometimes called Variants. Variants can differ by one or multiple mutations. All strains are variants, but not all variants are strains. XE Variant of Coronavirus:- XE is a sub-variant of Omicron, which caused the third wave of Covid-19. It was suspected of a woman in Mumbai, India in 2022. The Omicron variant, which is responsible for over 90% of the infections detected in 2022, has two prominent sub-variants, called 1 and BA.2. The XE variant is what is called a ‘recombinant’. This means it contains the mutations found in BA.1 as well as BA.2 varieties of Omicron. MUST READ: iNCOVACC SOURCE: DOWN TO EARTH PREVIOUS YEAR QUESTIONS Q.1) Consider the following: (2022) Aarogya Setu COWIN DigiLocker DIKSHA Which of the above are built on top of open-source digital platforms? 1 and 2 only 2, 3 and 4 only 1, 3 and 4 only 1, 2, 3 and 4 Q.2) In the context of vaccines manufactured to prevent the COVID-19 pandemic, consider the following statements: (2022) The Serum Institute of India produced a COVID-19 vaccine named Covishield using an mRNA platform. The Sputnik V vaccine is manufactured using a vector-based platform. COVAXIN is an inactivated pathogen-based vaccine. Which of the statements given above is correct? 1 and 2 only 2 and 3 only 1 and 3 only 1, 2 and 3 Uncontrolled Re-entry of satellites Syllabus Prelims –Science and Technology Context: Recent studies show that aeroplanes may face a growing risk of being hit by uncontrolled re-entries of rockets used to launch satellites. About Uncontrolled Re-entry of satellites:- IMAGE SOURCE: Everything about ISRO: History and Mission: Planets Education In an uncontrolled re-entry, the rocket stage simply falls. Its path down is determined by its shape, angle of descent, air currents and other characteristics. It disintegrates as it falls. Concerns:- As the smaller pieces fan out, the potential radius of impact will increase on the ground. Some pieces burn up entirely while others don’t. But because of the speed at which they’re travelling, debris can be deadly. If re-entering stages still hold fuel, atmospheric and terrestrial chemical contamination is another risk. Regulations:- There is no international binding agreement to ensure rocket stages always perform controlled re-entries nor on the technologies with which they can be controlled. The Liability Convention, 1972 requires countries to pay for damages, not prevent them. These technologies include wing-like attachments, de-orbiting brakes, extra fuel on the re-entering body, and design changes that minimise debris formation. MUST READ: RISAT and RISAT-2B SOURCE: DOWN TO EARTH PREVIOUS YEAR QUESTIONS Q.1) Which one of the following statements best reflects the idea behind the “Fractional Orbital Bombardment System” often talked about in media? (2022) A hypersonic missile is launched into space to counter the asteroid approaching the Earth and explode it in space. A spacecraft lands on another planet after making several orbital motions. A missile is put into a stable orbit around the Earth and deorbits over a target on the Earth. A spacecraft moves along a comet with the same surface. speed and places a probe on its Q.2) With reference to India’s satellite launch vehicles, consider the following statements: (2018) PSLVs launch satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites. Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth. GSLV Mk III is a four-stage launch vehicle with the first and third stages using solid rocket motors, and the second and fourth stages using liquid rocket engines. Which of the statements given above is/are correct.? 1 only 2 and 3 1 and 2 3 only Climate change impact on Salt Marshes Syllabus Prelims –Environment and Ecology Context: Recent studies show that more than 90% of the world’s salt marshes may soon succumb to sea level rise. About Salt Marshes:- These are types of wetlands. Wetlands: Lands transitional between terrestrial and aquatic ecosystems where the water table is usually at or near the surface or the land is covered by shallow water. These are periodically saturated, flooded, or ponded with water. They are characterized by herbaceous (non-woody) vegetation adapted to wet soil conditions. They are further characterized as tidal marshes and non-tidal marshes. Marshes are often divided into:- Freshwater Swamps These are often found hundreds of kilometres from the coast. These are dominated by grasses and aquatic plants. These marshes often develop around lakes and streams. Saltwater Marshes These are some of the richest ecosystems for biodiversity. They are dominated by grasses. They provide food and shelter for algae, fungi, shellfish, fish, amphibians, and reptiles. A few mangrove trees may dot saltwater marshes, but they are dominated by grasses and a layer of algae called an
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