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Subject: Basic Sciences

  • Magneto-Telluric Survey in the Delhi-NCR Region

    In the backdrop of multiple quakes of low intensity in the Delhi-NCR region, the National Centre for Seismology (NCS) is conducting a unique geophysical Magnetotelluric-MT survey to accurately assess potential seismic hazards.

    Try this PYQ:

    Q.Consider the following statements:

    1. The Earth’s magnetic field has reversed every few hundred thousand years.
    2. When the Earth was created more than 4000 million years ago, there was 54% oxygen and no carbon dioxide.
    3. When living organisms originated, they modified the early atmosphere of the Earth.

    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

    What is Magneto-Telluric Survey?

    • MT is a geophysical method which uses natural time variation of the earth’s magnetic and electric fields to understand the geological (underground) structure and processes.
    • It is an increasingly popular technique widely used to image the electrical resistivity distribution inside the Earth in various application fields ranging in scale from the shallow crust to the lithosphere.
    • In the MT method, the earth’s natural electromagnetic field is used as a source field.
    • The receivers record the electric and magnetic fields on the surface of the Earth.
    • The variations in amplitude and phase of the received signals can be interpreted in terms of the resistivity structure of the subsurface using the magnetotelluric impedance.

    Where would the MT survey be undertaken?

    • The survey is conducted across three major seismic sources, namely Mahendragarh-Dehradun Fault (MDF), Sohna Fault (SF) and Mathura Fault (MF).
    • It will ascertain the presence of fluids, which generally enhance the possibility of triggering earthquakes.

    Benefits of the survey

    • Its findings will help different user agencies for designing quake-resistant buildings, industrial units and structures such as hospitals and schools.
    • In addition to MT, analysis and interpretation of satellite imageries and geological field investigations for locating the faults are also being carried out.
    • Both these geophysical and geological surveys will help in taking multiple preventive measures in the quake-prone region.

  • Know the scientist: Dmitri Mendeleev

    Mendeleev was a Russian chemist and inventor who formulated the Periodic Law and the Periodic Table of Elements.

    Chemistry can, no wonder, find their place in exam if core Biology could do in 2020 CSP.

    Q.Which of the following statements is/are correct regarding the general difference between plant cells and animal cells?

    1. Plant cells have cellulose cell walls whilst animal cells do not.
    2. Plant cells do not have plasma membrane unlike animals cells which do
    3. Mature plant cell has one large vacuole whilst animal cell has many small vacuoles

    Select the correct answer using the given code below-

    (a) 1 and 2 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

    Dmitri Mendeleev

    • Mendeleev was born in the Siberian town of Tobolsk.
    • In 1861, Mendeleev published a textbook named Organic Chemistry, which won him the Demidov Prize of the Petersburg Academy of Sciences.
    • While explaining the chemical and physical properties of elements, he discovered similarities in the progression of atomic weights.
    • He found that the order of atomic weights could be used to arrange the elements within each group and the groups themselves.
    • Thus, Mendeleev formulated the periodic law. His Osnovy khimii (The Principles of Chemistry) became a classic, running through many editions and many translations.

    The Periodic Law

    • Using the Periodic Law, Mendeleev developed a systematic table of all the 63 elements then known.
    • He even predicted the locations of unknown elements together with their properties within the periodic table.
    • When these predicted elements, notably gallium ( 1875), scandium (1879), and germanium (1886) were discovered, Mendeleev Periodic Table began to gain wide acceptance.
    • Incidentally, in 1870, German chemist Julius Lothar Meyer also published a paper describing the same organisation of elements as Mendeleev’s. But the latter is given credit for the table.
    • In all, Mendeleev predicted 10 new elements, of which all but two turned out to exist. Element 101 is named Mendelevium in his honour.

    Also read:

    https://www.civilsdaily.com/news/mendeleev-and-his-periodic-table-of-elements/

  • India to explore Lithium reserves in Argentina

    India has inked a pact with an Argentine firm to jointly prospect lithium in the South American country.

    Why such a move?

    • Currently, India is heavily dependent on import of these cells and the move to ink sourcing pacts for lithium is seen as another salvo in the front against China, a key source of both the raw material and cells.
    • India is seen as a late mover as it attempts to enter the lithium value chain, coming at a time when EVs are predicted to be a sector ripe for disruption.
    • And 2021 is likely to be an inflexion point for battery technology, with several potential improvements to the Li-ion technology.

    About Lithium

    • Lithium is a chemical element with the symbol Li and atomic number 3.
    • It is a soft, silvery-white alkali metal. Under standard conditions, it is the lightest metal and the lightest solid element.
    • Like all alkali metals, lithium is highly reactive and flammable and must be stored in mineral oil.
    • When cut, it exhibits a metallic lustre, but moist air corrodes it quickly to a dull silvery grey, then black tarnish.
    • Lithium metal is isolated electrolytically from a mixture of lithium chloride and potassium chloride.
    • It is a crucial building block of the lithium-ion rechargeable batteries that power electric vehicles (EVs), laptops and mobile phones.

    Global producers of lithium

    • Australia and Chile have swapped positions as the world’s leading lithium-producing country over the past decade. In 2019, the world’s Top 5 lithium producers were:
    1. Australia – 52.9% of global production
    2. Chile – 21.5%
    3. China – 9.7%
    4. Argentina – 8.3%
    5. Zimbabwe – 2.1%
    • The U.S. ranked 7th with 1.2% of the world’s lithium production.
    • In 2019, the world’s Top 5 lithium reserves by country were:
    1. Chile – 55.5% of the world’s total
    2. Australia – 18.1%
    3. Argentina – 11.0%
    4. China – 6.5%
    5. U.S. – 4.1%

    Lithium-ion batteries

    • A lithium-ion battery or Li-ion battery is a type of rechargeable battery.
    • They are commonly used for portable electronics and electric vehicles and are growing in popularity for military and aerospace applications.
    • A prototype Li-ion battery was developed by Akira Yoshino in 1985, based on earlier research by John Goodenough, M. Stanley Whittingham, Rachid Yazami and Koichi Mizushima during the 1970s–1980s.
    • In 2019, the Nobel Prize in Chemistry was given to this trio “for the development of lithium-ion batteries”.

    How does it work?

    • In the batteries, lithium ions move from the negative electrode through an electrolyte to the positive electrode during discharge, and back when charging.
    • Li-ion batteries use an intercalated lithium compound as the material at the positive electrode and typically graphite at the negative electrode.
    • The batteries have a high energy density, no memory effect and low self-discharge.

    Try this PYQ:

    Q.Hydrogen fuel cell vehicles produce one of the following as “exhaust”:

    (a) NH3

    (b) CH4

    (c) H2O

    (d) H2O2

    Limitations

    • Despite the improvements in lithium-ion batteries over the last decade, long charging times and weak energy density are still barriers.
    • The Li-ion batteries are seen as sufficiently efficient for applications such as phones and laptops, in case of EVs.
    • They still lack the range that would make them a viable alternative to internal combustion engines.
    • A number of alternatives are being fostered to achieve more optimal options.

  • [pib] 40th Indian Scientific Expedition to Antarctica (ISEA)

    40th Indian Scientific Expedition is set to depart for Antarctica from Mormugao Port, Goa.

    Try this question:

    Q.How does the cryosphere affect global climate? (150W, CSM 2018)

    Indian mission on the Antarctic

    • The Indian Antarctic Program is a multi-disciplinary, multi-institutional program under the control of the National Centre for Antarctic and Ocean Research, Ministry of Earth Sciences.
    • It was initiated in 1981 with the first Indian expedition to Antarctica.
    • The program gained global acceptance with India’s signing of the Antarctic Treaty and subsequent construction of the Dakshin Gangotri Antarctic research base in 1983, superseded by the Maitri base from 1990.
    • The newest base commissioned in 2015 is Bharati, constructed out of 134 shipping containers.

    Its significance

    • This 40th expedition is procuring fuel from India after about 22 years. Till the last expedition, fuel was being obtained from outside the country.
    • Indian Oil Co. Ltd. has supplied aviation fuel, Jet A1 in bulk and packed form to a non-aviation customer and is delivered to an ocean-going vessel for the first time.

    Why need such a mission?

    • Polar Regions are crucially important in answering key questions about global climate change.
    • It contributes towards the global sea-level rise, the background aerosol properties, variability in the sea ice cover and phenomena like Antarctic haze and ozone concentrations.
    • Attempts to address some of these issues are helping in mitigating several important problems concerning human life and well-being.

    Back2Basics: India’s polar missions

    • The first Indian expedition to Antarctica sailed from Goa on December 6, 1981, and reached the shores of this polar continent on January 9, 1982.
    • India has two stations in the polar continent of Antarctica – Maitri and Bharati, which are being operated under NCPOR, Ministry of Earth Sciences.

    Indian mission on the Arctic

    • Himadri Station is India’s first Arctic research station located at Spitsbergen, Svalbard, Norway. It is located at the International Arctic Research base, Ny-Ålesund.
    • It was inaugurated on the 1st of July, 2008 by the Minister of Earth Sciences. It is followed by IndARC.
    • The United States Geological Survey estimates that 22% of the world’s oil and natural gas could be located beneath the Arctic.
    • ONGC Videsh has signed joint-venture with Russia for oil exploration there.

  • ‘Digital Ocean’: the Digital Platform for Ocean Data Management

    The Ministry of Earth Sciences has inaugurated the web-based application “Digital Ocean” developed by INCOIS.

    Digital Ocean

    • Digital Ocean is a first of its kind digital platform for Ocean Data Management.
    • The platform will be promoted as a platform for capacity building on Ocean Data Management for all Indian Ocean Rim countries.
    • It would help share ocean knowledge about the ocean with a wide range of users including research institutions, operational agencies, strategic users, the academic community, and the maritime industry and policymakers.
    • It also provides free access to information to the general public and the common man.
    • It will play a central role in the sustainable management of our oceans and expanding ‘Blue Economy’ initiatives.

    Its’ features

    • It includes a set of applications developed to organize and present heterogeneous oceanographic data by adopting rapid advancements in geospatial technology.
    • It facilitates:
    1. Online interactive web-based environment for data integration,
    2. 3D and 4D (3D in space with time animation) data visualization,
    3. Data analysis to assess the evolution of oceanographic features,
    4. Data fusion and multi-format download of disparate data from multiple sources viz., in-situ, remote sensing, and model data, all of which is rendered on a georeferenced 3D Ocean.

  • IISER scientists identify the gene that greens plants

    Researchers at the Indian Institute of Science Education and Research (IISER) have identified a gene that facilitates in the greening of plants.

    It would be no surprise to expect a core Biology question in the coming years, if we look at this PYQ:

    Q. Which of the following statements are correct regarding the general difference between plant cells and animal cells? (CSP 2020)

    1. Plant cells have cellulose cell walls whilst animal cells do not.
    2. Plant cells do not have plasma membrane unlike animals cells which do
    3. Mature plant cell has one large vacuole whilst animal cell has many small vacuoles

    Select the correct answer using the given code below-

    (a) 1 and 2 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

    BBX11

    • The synthesis of chlorophyll in plants is a lengthy, multi-step process.
    • When a seedling emerges from under the soil it must quickly synthesize chlorophyll to start supporting its own growth.
    • In order to facilitate the quick synthesis of chlorophyll, plants make a precursor of chlorophyll called ‘protochlorophyllide’ in the dark, which glows red when blue light is shone on the plant.
    • As soon as the plant comes out into the light from under the soil, light-dependent enzymes convert protochlorophyllide to chlorophyll.
    • The two proteins oppositely regulate the ‘BBX11’ gene to maintain optimum levels of ‘BBX11’.

    How does it work?

    • It plays a crucial role in regulating the levels of protochlorophyllide — an intermediate in the biosynthesis of the green pigment chlorophyll.
    • The amount of protochlorophyllide synthesized needed to be proportional to the number of enzymes available to convert them to chlorophyll.
    • If there is an excess of free protochlorophyllide, then exposure to light converts it into molecules that cause ‘photobleaching’.
    • Thus, it is very important to regulate the amount of protochlorophyllide synthesized by the plant and here comes the vital plant played by the ‘BBX11’ gene.
    • If it is less, plants are unable to efficiently ‘green’ in order to harvest sunlight.

    Benefits of the research

    • The study could have tremendous implications in the agriculture sector in tropical countries like India and can help provide leads to optimize plant growth under stressful and rapidly changing climatic conditions.
    • Due to the rapidly changing climatic conditions, farmers in several states in India, especially in Maharashtra, are suffering huge losses in crop yields.
    • This often leads to severe distress among the farming community as indicated by the high number of farmer suicides in Maharashtra for the past several years.
    • Severe drought, high temperature and high light are some of the major reasons for crop failure. Young seedlings emerging out of the soil are extremely sensitive to high irradiance of light.
    • This study can provide leads to optimize plant growth under these stressful conditions.

  • How dangerous is Ammonia?

    Two persons died and several took ill in a major ammonia gas leakage at a fertilizers unit at Prayagraj.

    Try this PYQ:

    Q. With reference to chemical fertilizers in India, consider the following statements:

    1. At present, the retail price of chemical fertilizers is market-driven and not administered by the Government.
    2. Ammonia, which is an input of urea, is produced from natural gas.
    3. Sulphur, which is a raw material for phosphoric acid fertilizer, is a by-product of all oil refineries.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 and 3 only

    (c) 2 only

    (d) 1,2 and 3

    Ammonia

    • Ammonia is critical in the manufacturing of fertilizers and is one of the largest-volume synthetic chemicals produced in the world.
    • More than 80 per cent of ammonia made is consumed in the manufacturing of fertilizer, and most of the remainder goes into the production of formaldehyde.
    • A tri-hydroid of nitrogen (NH3), ammonia is a building block for ammonium nitrate (NH4NO3) that is used in agriculture as a high-nitrogen fertilizer.

    Why is it harmful?

    • According to experts in Chemistry, ammonia is stored for industrial use in liquid form under high pressure or in gaseous form at low temperature.
    • In such cases, the cause of death is always suffocation as in the case of Prayagraj incident, the victims must have been very close to the point of a gas leak.

    Effects on the human body

    • Ammonia, even in moderate concentration, can cause irritation to eyes, skin, nose and throat.
    • It interacts immediately upon contact with moisture present in the skin, eyes, oral cavity, and respiratory tract to form ammonium hydroxide.
    • It is very caustic and disrupts the cell membrane lipids, ultimately leading to cellular destruction.
    • As cell proteins break down, water is extracted, resulting in an inflammatory response that causes further damage.

    Secretion in humans

    • Ammonia, which is highly soluble in water, is found in soil, air, and water; it is naturally present in the body.
    • It is secreted by the kidneys to neutralize excess acid.
    • However, it is highly diluted when in the environment and does not affect the human body to a noticeable level.

  • What are Fastags?

    From January 1, all lanes of National Highways will accept only electronic payments through FASTag.

    Fastags work on a unique technology called RFID (Radio Frequency Identification). This has gone unnoticed in several competitive exams. Hence it is still relevant for the aspirants.

    Also read

    Fastags

    • As per Central Motor Vehicles Rules, 1989, since 1st December 2017, the FASTag had been made mandatory for all registered new four-wheelers and is being supplied by the Vehicle Manufacturer or their dealers.
    • It has been mandated that the renewal of fitness certificate will be done only after the fitment of FASTag.
    • For National Permit Vehicles, the fitment of FASTag was mandated since 1st October 2019.

    What is ‘FASTag’?

    • FASTags are stickers that are affixed to the windscreen of vehicles and use Radio Frequency Identification (RFID) technology to enable digital, contactless payment of tolls without having to stop at toll gates.
    • The tags are linked to bank accounts and other payment methods.
    • As a car crosses a toll plaza, the amount is automatically deducted, and a notification is sent to the registered mobile phone number.

    How does it work?

    • The device employs Radio Frequency Identification (RFID) technology for payments directly from the prepaid or savings account linked to it.
    • It is affixed on the windscreen, so the vehicle can drive through plazas without stopping.
    • RFID technology is similar to that used in transport access-control systems, like Metro smart card.
    • If the tag is linked to a prepaid account like a wallet or a debit/credit card, then owners need to recharge/top up the tag.
    • If it is linked to a savings account, then money will get deducted automatically after the balance goes below a pre-defined threshold.
    • Once a vehicle crosses the toll, the owner will get an SMS alert on the deduction. In that, it is like a prepaid e-wallet.

  • Why the universe has less ‘antimatter’ than matter?

    This newscard is an excerpt from the original article published in DownToEarth.

    Try this PYQ:

    Q.The known forces of nature can be divided into four classes, viz, gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?

    (a) Gravity is the strongest of the four

    (b) Electromagnetism act only on particles with an electric charge

    (c) Weak nuclear force causes radioactivity

    (d) Strong nuclear force holds protons and neutrons inside the nuclear of an atom.

    What is Antimatter?

    • Antimatter is the opposite of normal matter. More specifically, the sub-atomic particles of antimatter have properties opposite those of normal matter.
    • The electrical charge of those particles is reversed.
    • Antimatter was created along with matter after the Big Bang, but antimatter is rare in today’s universe.
    • To better understand antimatter, one needs to know more about the matter.
    • The matter is made up of atoms, which are the basic units of chemical elements such as hydrogen, helium or oxygen.

    Their existence

    • The existence of antimatter was predicted by physicist Paul Dirac’s equation describing the motion of electrons in 1928.
    • At first, it was not clear if this was just a mathematical quirk or a description of a real particle.
    • But in 1932 Carl Anderson discovered an antimatter partner to the electron — the positron — while studying cosmic rays that rain down on Earth from space.
    • Over the next few decades’ physicists found that all matter particles have antimatter partners.
    • Scientists believe that in the very hot and dense state shortly after the Big Bang, there must have been processes that gave preference to matter over antimatter.
    • This created a small surplus of matter, and as the universe cooled, all the antimatter was destroyed, or annihilated, by an equal amount of matter, leaving a tiny surplus of matter.
    • And it is this surplus that makes up everything we see in the universe today.

    Studying the difference between matter and antimatter

    • A Quark is a type of elementary particle and a fundamental constituent of matter.
    • Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei.
    • The behaviour of quarks, which are the fundamental building blocks of matter along with leptons, can shed light on the difference between matter and antimatter.
    • Since they are unstable, they will “decay” — fall apart — into other more stable particles at some point during their oscillation.

  • What is Intentional Genomic Alteration?

    The US Food and Drug Administration (FDA) approved a first-of-its-kind intentional genomic alteration (IGA) in a line of domestic pigs referred to as GalSafe pigs.

    Try this PYQ:

    Q.What is Cas9 protein that is often mentioned in news?

    (a) A molecular scissors used in targeted gene editing

    (b) A biosensor used in the accurate detection of pathogens in patients

    (c) A gene that makes plants pest-resistant

    (d) A herbicidal sub

    What is Intentional Genomic Alteration?

    • Intentional genomic alteration in animals’ means making specific changes to the genome of the organism using modern molecular technologies.
    • These are popularly referred to as “genome editing” or “genetic engineering”. However, there are other technologies that can be used to make IGAs in animals.
    • Such changes in the DNA sequence of an animal may be carried out for research purposes, to produce healthier meat for human consumption and to study disease resistance in animals among other reasons.
    • One example is of using IGAs to make an animal more susceptible to certain diseases such as cancer, which helps researchers get a better understanding of the disease and develop new therapies to treat it.

    What does FDA’s recent approval mean?

    • The FDA made the announcement this week and allowed IGA in GalSafe pigs to eliminate a type of sugar found in mammals called alpha-gal.
    • This sugar is present on the surface of these pigs’ cells and when they are used for products such as medicines or food.
    • The sugar is found in red meats such as beef, pork and lamb, the sugar makes some people with Alpha-gal Syndrome (AGS) more susceptible to developing mild to severe allergic reactions.
    • IGA will help eventually free these products from detectable alpha-gal sugar, thereby protecting their human consumers from potential allergies.