Note4Students
From UPSC perspective, the following things are important :
Prelims level: UV technology for disinfection
Mains level: Not Much
The Union Ministry for Science and Technology has informed that Ultraviolet-C or UV-C Disinfection Technology will soon be installed in Parliament for the mitigation of airborne transmission of SARS-COV-2.
UV-C air duct disinfection system
- The UV-C air duct disinfection system was developed by CSIR-CSIO (Central Scientific Instruments Organisation).
- The system is designed to fit into any existing air-ducts and the virucidal dosages using UV-C intensity and residence time can be optimized according to the existing space.
- The release adds that the virus is deactivated in any aerosol particles by the calibrated levels of UV-C light. It can be used in auditoriums, malls, educational Institutions, AC buses, and railways.
What is Ultraviolet (UV)?
- Ultraviolet (UV) is a type of light or radiation naturally emitted by the Sun. It covers a wavelength range of 100-400 nm. The human visible light ranges from 380–700 nm.
- UV is divided into three bands: UV-C (100-280 nm), UV-B (280-315 nm) and UV-A (315-400 nm).
- UV-A and UV-B rays from the Sun are transmitted through our atmosphere and all UV-C is filtered by the ozone layer.
- UV-B rays can only reach the outer layer of our skin or epidermis and can cause sunburns and are also associated with skin cancer.
- UV-A rays can penetrate the middle layer of your skin or the dermis and can cause ageing of skin cells and indirect damage to cells’ DNA.
- UV-C radiation from man-made sources has been known to cause skin burns and eye injuries.
So, can UV-C kill coronavirus?
- UV-C radiation (wavelength around 254 nm) has been used for decades to disinfect the air in hospitals, laboratories, and also in water treatment.
- But these conventional germicidal treatments are done in unoccupied rooms as they can cause health problems.
- It can destroy the outer protein coating of the SARS-Coronavirus.
Is it safe for humans?
- The device is specifically developed to disinfect non-living things.
- UV-C radiation used in this device could be harmful to the skin and eyes of living beings.
Answer this PYQ in the comment box:
Q.What is the role of ultraviolet (UV) radiation in the water purification systems?
- It inactivates/kills the harmful microorganisms in water.
- It removes all the undesirable odours from the water.
- It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
Which of the statements given above is/are correct? (CSP 2010)
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Lightening and Thunderstorms
Mains level: Not Much
With the monsoon making a slow revival over several parts of India, except the northwest region, there is a rise in lightning-linked deaths.
What is lightning?
- Lightning is a very rapid — and massive — discharge of electricity in the atmosphere, some of which is directed towards the Earth’s surface.
- These discharges are generated in giant moisture-bearing clouds that are 10-12 km tall.
- The base of these clouds typically lies within 1-2 km of the Earth’s surface, while their top is 12-13 km away.
- Temperatures towards the top of these clouds are in the range of minus 35 to minus 45 degrees Celsius.
How does it strike?
- As water vapour moves upward in the cloud, the falling temperature causes it to condense.
- Heat is generated in the process, which pushes the molecules of water further up.
- As they move to temperatures below zero degrees Celsius, the water droplets change into small ice crystals. They continue to move up, gathering mass — until they are so heavy that they start to fall to Earth.
- This leads to a system in which, simultaneously, smaller ice crystals are moving up and bigger crystals are coming down.
- Collisions follow and trigger the release of electrons — a process that is very similar to the generation of sparks of electricity.
- As the moving free electrons cause more collisions and more electrons, a chain reaction ensues.
- This process results in a situation in which the top layer of the cloud gets positively charged, while the middle layer is negatively charged.
Making of the thunder
- The electrical potential difference between the two layers is huge — of the order of a billion to 10 billion volts.
- In very little time, a massive current, of the order of 100,000 to a million amperes, starts to flow between the layers.
- An enormous amount of heat is produced, and this leads to the heating of the air column between the two layers of the cloud.
- This heat gives the air column a reddish appearance during lightning. As the heated air column expands, it produces shock waves that result in thunder.
How does this current reach the Earth from the cloud?
- While the Earth is a good conductor of electricity, it is electrically neutral.
- However, in comparison to the middle layer of the cloud, it becomes positively charged.
- As a result, about 15%-20% of the current gets directed towards the Earth as well.
- It is this flow of current that results in damage to life and property on Earth.
- There is a greater probability of lightning striking tall objects such as trees, towers or buildings.
- Once it is about 80-100 m from the surface, lightning tends to change course towards these taller objects.
- This happens because air is a poor conductor of electricity, and electrons that are travelling through air seek both a better conductor and the shortest route to the relatively positively charged Earth’s surface.
What precautions should be taken against lightning?
- Lightning rarely hits people directly — but such strikes are almost always fatal.
- People are most commonly struck by what are called “ground currents”.
- The electrical energy, after hitting a large object (such as a tree) on Earth, spreads laterally on the ground for some distance, and people in this area receive electrical shocks.
- It becomes more dangerous if the ground is wet (which it frequently is because of the accompanying rain), or if there is metal or other conducting material on it.
- Water is a conductor, and many people are struck by lightning while standing in flooded paddy fields.
- For the reasons given above, taking shelter under a tree is dangerous. Lying flat on the ground too can increase risks.
- People should move indoors in a storm; however, even indoors, they should avoid touching electrical fittings, wires, metal, and water.
Answer this PYQ in the comment box:
Q.During a thunderstorm, the thunder in the skies is produced by the:
- meeting of cumulonimbus clouds in the sky
- lightning that separates the nimbus clouds
- violent upward movement of air and water particles
Select the correct option using the codes given below (CSP 2011):
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) None of the above
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Cryptocurrencies
Mains level: Issues with Cryptocurrencies
Last week, Twitter CEO announced his payments firm Square would soon build a hardware wallet to store bitcoin.
Bitcoin Hardware Wallet
- The wallet will be a type of plug-in device, much like a USB pen drive that stores, manages and secures a user’s crypto assets.
- Each digital asset is linked to a cryptographic password called a ‘private key’ to allow users to access it.
- This key safeguards cryptocurrencies from theft and unauthorized access.
- The asset owner, with the help of a secure hardware wallet, can access the private key to buy and sell crypto assets from anywhere.
- Most hardware wallets allow users to manage multiple accounts; some even allow users to connect to their Google or Facebook accounts.
- Popular hardware wallets include Trezor, Ledger, KeepKey and Prokey.
How is it different from a software wallet?
- Cryptocurrency keys can be stored in two kinds of wallets – software and hardware.
- Software wallets are like smartphone apps that digitally store private keys.
- Most software wallets don’t charge users to store private keys but may collect a commission for trading via the app.
- These wallets can be vulnerable to malware.
- Hardware wallets and physical devices act like cold storage for confidential keys. The passwords are protected by a PIN, making it difficult for hackers to extract private keys as the information is not exposed to the Internet.
The upsides of a hardware wallet
- Hardware wallets are said to be convenient as they can be connected to trading exchanges to complete transactions.
- Hardware wallets are often stored in a protected microcontroller and cannot be transferred out of the device, making them secure.
- Their isolation from the Internet also mitigates the risk of the assets being compromised. Moreover, it does not rely on any third-party app.
Limitations
- Since the wallet is in physical form, the device could be stolen or destroyed.
- They could be used by malicious actors to steal confidential data.
- The device can also be expensive as compared to software wallets.
- Some hardware wallets can also have complex features, making it difficult for first-timers to understand.
Answer this PYQ in the comment box:
Q.With reference to “Blockchain Technology”, consider the following statements:
- It is a public ledger that everyone can inspect but which no single user controls.
- The structure and design of block chain is such that all the data in it are about crypto currency only.
- Applications that depend on basic features of blockchain can be developed without anybody’s permission.
Which of the statement given above is/are correct?
(a) 1 only
(b) 2 only
(b) 1 and 2 only
(d) 1 and 3
Back2Basics: Cryptocurrencies
- A cryptocurrency is a digital asset designed to work as a medium of exchange wherein individual coin ownership records are stored in a ledger existing in a form of a computerized database.
- It uses strong cryptography to secure transaction records, control the creation of additional coins, and verify the transfer of coin ownership.
- It typically does not exist in physical form (like paper money) and is typically not issued by a central authority.
- Cryptocurrencies typically use decentralized control as opposed to centralized digital currency and central banking systems.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: G-Secs
Mains level: Not Much
The RBI has announced a scheme under which retail investors will be allowed to open retail direct gilt accounts (RDG) directly with the central bank.
Retail Direct Scheme
- The scheme is a one-stop solution to facilitate investment in government securities (G-secs) by individual investors.
- Under RDG schemes, accounts can be opened through a dedicated online portal, which will provide registered users access to primary issuance of government securities and to NDS-OM.
What is a gilt account?
- A “Gilt Account” means an account opened and maintained for holding Government securities, by an entity or a person including ‘a person resident outside India’ with a “Custodian” permitted by the RBI.
About Government Securities
- These are debt instruments issued by the government to borrow money.
- The two key categories are:
- Treasury bills (T-Bills) – short-term instruments which mature in 91 days, 182 days, or 364 days, and
- Dated securities – long-term instruments, which mature anywhere between 5 years and 40 years
Note: T-Bills are issued only by the central government, and the interest on them is determined by market forces.
Why G-Secs?
- Like bank fixed deposits, g-secs are not tax-free.
- They are generally considered the safest form of investment because they are backed by the government. So, the risk of default is almost nil.
- However, they are not completely risk-free, since they are subject to fluctuations in interest rates.
- Bank fixed deposits, on the other hand, are guaranteed only to the extent of Rs 5 lakh by the Deposit Insurance and Credit Guarantee Corporation (DICGC).
Retail investors and G-Secs
- Small investors can invest indirectly in g-secs by buying mutual funds or through certain policies issued by life insurance firms.
- To encourage direct investment, the government and RBI have taken several steps in recent years.
- Retail investors are allowed to place non-competitive bids in auctions of government bonds through their Demat accounts.
- Stock exchanges act as aggregators and facilitators of retail bids.
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From UPSC perspective, the following things are important :
Prelims level: Black Sea mapping
Mains level: India-Georgia ties
After a long-standing request of Georgia, External Affairs Minister handed over the holy relics of 17th century Georgian Queen St. Ketevan nearly 16 years after they were found in Goa.
Who was St. Ketevan?
- Queen Ketevan was a 17th century Georgian Queen.
- From Kakheti, a kingdom in eastern Georgia, she was tortured and killed in 1624 in Shiraz during the rule of the Safavid dynasty.
- Portuguese missionaries were said to have carried the relics to Goa in 1627.
- In 2005, after years of research and study of medieval Portuguese records, the relics were found at the St. Augustine Church in Old Goa.
Importance of Georgia for India
- Georgia a strategically important country situated at the intersection of Eastern Europe and Western Asia.
- Relations between Georgia and India date back to ancient times.
- The Panchatantra influenced Georgian folk legends. During the medieval period, Georgian missionaries, travelers, and traders visited India.
- Some Georgians served in the courts of Mughal emperors, and a few rose to the rank of governor.
- India was among the first countries to officially recognize Georgia, doing so on 26 December 1991.
- India is a net exporter to Georgia.
- The main commodities exported by India to Georgia are cereals, nuclear reactors, boilers, machinery and mechanical appliances, pharmaceuticals, electrical machinery and equipment, aluminium and aluminium articles.
Answer this PYQ in the comment box:
Q.Consider the following pairs:
| Sea |
Bordering Country |
| 1. |
Adriatic Sea |
Albania |
| 2. |
Black Sea |
Croatia |
| 3. |
Caspian Sea |
Kazakhstan |
| 4. |
Mediterranean Sea |
Morocco |
| 5. |
Red Sea |
Syria |
Which of the pairs given above are correctly matched? (CSP 2019)
(a) 1, 2 and 4 only
(b) 1, 3 and 4 only
(c) 2 and 5 only
(d) 1, 2, 3, 4 and 5
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From UPSC perspective, the following things are important :
Prelims level: Mekedatu Project
Mains level: Inter-state river disputes
Karnataka and Tamil Nadu are again at the crossroads against the Mekedatu dam project in the Cauvery River Basin.
What is the Mekedatu Project?
- Mekedatu, meaning goat’s leap, is a deep gorge situated at the confluence of the rivers Cauvery and Arkavathi, about 100 km from Bengaluru, at the Kanakapura taluk in Karnataka’s Ramanagara district.
- In 2013, then Karnataka announced the construction of a multi-purpose balancing reservoir project.
- The project aimed to alleviate the drinking water problems of the Bengaluru and Ramanagara districts.
- It was also expected to generate hydroelectricity to meet the power needs of the state.
Issues with the project
- Soon after the project was announced TN has objected over granting of permission or environmental clearance.
- Explaining the potential for damage to the lower riparian state of TN, it said that the project was in violation of the final award of the Cauvery Water Disputes Tribunal.
- It stated that the project will affect the natural flow of the river Cauvery considerably and will severely affect the irrigation in TN.
What do the Cauvery Water Disputes Tribunal and the Supreme Court say?
- The Cauvery Water Disputes Tribunal, in its final order on February 2007, made allocations to all the riparian States — Karnataka, Kerala and Tamil Nadu, apart from the Union Territory of Puducherry.
- It also stipulated “tentative monthly deliveries during a normal year” to be made available by Karnataka to Tamil Nadu.
- Aggrieved over the final order for different reasons, the States had appealed to the Supreme Court.
- In February 2018, the court, in its judgment, revised the water allocation and increased the share of Karnataka by 14.75 thousand million cubic feet (tmc ft) at the cost of Tamil Nadu.
- The enhanced quantum comprised 4.75 tmc ft for meeting drinking water and domestic requirements of Bengaluru and surrounding areas.
What is Karnataka planning?
- Encouraged by the Supreme Court verdict, Karnataka, which sees the order as an endorsement of its stand, has set out to pursue the Mekedatu project.
- Originally proposed as a hydropower project, the revised Mekedatu dam project has more than one purpose to serve.
- A hydropower plant of nearly 400 MW has also been proposed.
- The Karnataka government has argued that the proposed reservoir will regulate the flow to Tamil Nadu on a monthly basis, as stipulated by the Tribunal and the Supreme Court.
- This is why Karnataka has contended that the project will not affect the interests of Tamil Nadu farmers.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Next-generation DNA sequencing
Mains level: Not Much
The 2020 Millennium Technology Prize has been awarded to Shankar Balasubramanian and David Klenerman, for their development of revolutionary Next-generation DNA sequencing techniques.
About Millennium Technology Prize
- The Millennium Technology Prize is one of the world’s largest technology prizes.
- It is awarded once every two years by Technology Academy Finland, an independent fund established by Finnish industry and the Finnish state in partnership.
What is next-generation DNA sequencing?
- Next-generation sequencing (NGS) is a massively parallel sequencing technology that offers ultra-high throughput, scalability, and speed.
- The technology is used to determine the order of nucleotides in entire genomes or targeted regions of DNA or RNA.
- These technologies allow for sequencing of DNA and RNA much more quickly and cheaply than the previously used sequencing.
- NGS has revolutionized the biological sciences, allowing labs to perform a wide variety of applications and study biological systems at a level never before possible.
- More than a million base pairs can be sequenced, which translates to hundreds of genes or even the whole genome of an organism.
- This is made possible by simultaneously sequencing hundreds of pieces of DNA at the same time.
What is sequencing, btw?
- DNA (or RNA, in some viruses), the genetic material of life forms, is made of four bases (A, T, G and C; with U replacing T in the case of RNA).
- A chromosome is the duplex of a long linear chain of these – and in the DNA sequence is information – the blueprint of life.
- Life famously can replicate, and DNA replicates when an enzyme, DNA polymerase, synthesises a complementary strand using an existing DNA strand as the template.
- The breakthrough idea of Balasubramanian and Klenerman was to sequence DNA (or RNA) using this process of strand synthesis.
- They cleverly modified their ATGC bases so that each shone with a different colour.
- When copied, the “coloured” copy of DNA could be deciphered from the colours alone, using miniature optical and electronic devices.
What about the cost of all this sequencing?
- When the Human Genome Project delivered the first, near-complete sequence of our genome, the cost was estimated to have been 3 billion dollars.
- As all our chromosomes together have 3 billion base pairs, it becomes an easy calculation – One dollar per sequenced base.
- By the year 2020, NGS technologies has pushed the price for sequencing to a few thousands of rupees.
Back2Basics:
What is the Human Genome Project?
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From UPSC perspective, the following things are important :
Prelims level: Flora of Sikkim
Mains level: NA
Sikkim, the smallest State with less than 1% of India’s landmass, is home to 27% of all flowering plants found in the country, reveals a recent publication by the Botanical Survey of India (BSI).
Flora of Sikkim
- Flora of Sikkim – A Pictorial Guide lists 4,912 naturally occurring flowering plants in the tiny Himalayan State.
- The total number of naturally occurring flowering plants in the country is about 18,004 species, and with 4,912 species, the diversity of flowering plants in Sikkim, spread over an area of 7,096 sq. km. is very unique.
Why is Sikkim a host to such large biodiversity?
- Sikkim is a part of the Kanchenjunga biosphere landscape, has different altitudinal ecosystems, which provide opportunities for herbs and trees to grow and thrive.
- The State also borders China, Bhutan and Nepal, and the Darjeeling Hills of West Bengal.
- From subalpine vegetation to the temperate to the tropical, the State has different kinds of vegetation, and that is the reason for such a diversity of flora.
- The elevation also varies between 300 to 8,598 metres above mean sea level, the apex being the top of Mt. Kanchenjunga (8,586 metres).
Contribution by the Public
- The people of Sikkim have a unique bond with nature and trees.
- As per the Sikkim Forest Tree (Amity & Reverence) Rules, 2017 the State government allows any person to associate with trees standing on his or her private land or on any public land by entering into a Mith/Mit or Mitini relationship.
- The notification encouraged people to adopt a tree “as if it was his or her own child in which case the tree shall be called an adopted tree”.
Answer this PYQ in the comment box:
Q.Which one of the following National Parks lies completely in the temperate alpine zone?
(a) Manas National Park
(b) Namdapha National Park
(c) Neora Valley National Park
(d) Valley of Flowers National Park
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From UPSC perspective, the following things are important :
Prelims level: Graded Response Action Plan (GRAP)
Mains level: Graded Response Action Plan (GRAP)
Fearing any surge in coronavirus cases in the national capital, which is witnessing a decline in cases of infection, the Delhi government has chalked out the ‘Graded Response Action Plan (GRAP).’
Graded Response Action Plan (GRAP)
- In 2014, when a study by the WHO found that Delhi was the most polluted city in the world, panic spread in the Centre and the state government.
- Approved by the Supreme Court in 2016, the plan was formulated after several meetings that the Environment Pollution (Prevention and Control) Authority (EPCA) held with state government and experts.
- The result was a plan that institutionalized measures to be taken when air quality deteriorates.
- GRAP also works as an emergency measure.
- It includes strict measures such as a ban on the entry of heavy vehicles, the odd-even road rationing restrictions, and a halt of construction work – each of which is likely to be impractical at a time when the pandemic has exacted heavy economic costs and public transport has been seen as an infection risk.
For covid purposes
- This time, it was decided to notify the GRAP that will “objectively and transparently” ensure an “institutional and automatic” response with regards to enforcement measures, lockdowns and unlock activities.
- The plan was prepared in comparison with ascent data of the four waves at specific positivity rates of 0.5%, 1%, 2% and 5% and also considered on the basis of the earlier four waves.
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From UPSC perspective, the following things are important :
Prelims level: Methanogens on saturn's moon
Mains level: Hunt for extra-terrestrial life
NASA’s Cassini spacecraft has detected an unusually high concentration of methane, along with carbon dioxide and dihydrogen, in the moons of Saturn by flying through their plumes.
What is the new observation?
- The spacecraft has found that Titan has methane in its atmosphere and Enceladus has a liquid ocean with erupting plumes of gas and water.
Are there methane-producing organisms on Earth?
- Most of the methane on Earth has a biological origin.
- Microorganisms called methanogens are capable of generating methane as a metabolic byproduct.
- They do not require oxygen to live and are widely distributed in nature.
- They are found in swamps, dead organic matter, and even in the human gut.
- They are known to survive in high temperatures and simulation studies have shown that they can live in Martian conditions.
- Methanogens have been widely studied to understand if they can be a contributor to global warming.
Could there be methanogens on Enceladus?
- We cannot conclude that life exists in the Enceladus ocean.
- It is the probability that Enceladus’ hydrothermal vents could be habitable to Earth-like microorganisms.
- There can be life hypotheses.
What other processes could have produced the methane?
- Methane could be formed by the chemical breakdown of organic matter present in Enceladus’ core.
- Hydrothermal processes could help the formation of carbon dioxide and methane.
- On Earth, hydrothermal vents on seafloors are known to release methane, but this happens at a very slow rate.
- This hypothesis is plausible but only if Enceladus was formed through the accretion of organic-rich material from comets.
- The results suggest that methane production from hydrothermal vents is not sufficient to explain the high methane concentration detected by Cassini in the plumes.
- An additional amount of methane produced via biological methanogenesis could match Cassini’s observations.
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From UPSC perspective, the following things are important :
Prelims level: Aurora, Hope Mission
Mains level: Study of Mars
The UAE’s Hope spacecraft, which is orbiting Mars since February this year, has captured images of glowing atmospheric lights in the Red Planet’s night sky, known as discrete auroras.
What causes an Aurora on Earth?
- Auroras are caused when charged particles ejected from the Sun’s surface — called the solar wind — enter the Earth’s atmosphere.
- These particles are harmful, and our planet is protected by the geomagnetic field, which preserves life by shielding us from the solar wind.
- However, at the north and south poles, some of these solar wind particles are able to continuously stream down, and interact with different gases in the atmosphere to cause a display of light in the night sky.
- This display, known as an aurora, is seen from the Earth’s high latitude regions (called the auroral oval), and is active all year round.
Where are they observed on Earth?
- In the northern part of our globe, the polar lights are called aurora borealis or Northern Lights and are seen from the US (Alaska), Canada, Iceland, Greenland, Norway, Sweden and Finland.
- In the south, they are called aurora australis or southern lights and are visible from high latitudes in Antarctica, Chile, Argentina, New Zealand and Australia.
So, how are Martian auroras different?
- Unlike auroras on Earth, which are seen only near the north and south poles, discrete auroras on Mars are seen all around the planet at night time.
- Unlike Earth, which has a strong magnetic field, the Martian magnetic field has largely died out.
- This is because the molten iron at the interior of the planet– which produces magnetism– has cooled.
- However, the Martian crust, which hardened billions of years ago when the magnetic field still existed, retains some magnetism.
- So, in contrast with Earth, which acts like one single bar magnet, magnetism on Mars is unevenly distributed, with fields strewn across the planet and differing in direction and strength.
- These disjointed fields channel the solar wind to different parts of the Martian atmosphere, creating “discrete” auroras over the entire surface of the planet as charged particles interact with atoms and molecules in the sky– as they do on Earth.
Why is it important to study them?
- Studying Martian auroras is important for scientists, for it can offer clues as to why the Red Planet lost its magnetic field and thick atmosphere– among the essential requirements for sustaining life.
Answer this PYQ in the comment box:
Q.Which region of Mars has a densely packed river deposit indicating this planet had water 3.5 billion years ago?
(a) Aeolis Dorsa
(b) Tharsis
(c) Olympus Mons
(d) Hellas
Back2Basics:
Hope Orbiter
- The Hope Probe, the Arab world’s first mission to Mars, took off from Earth in July last year, and has been orbiting the Red Planet since February.
- The primary objective of the mission is to study Martian weather dynamics.
- By correlating the lower atmosphere and upper atmosphere conditions, the probe will look into how weather changes the escape of hydrogen and oxygen into space.
- By measuring how much hydrogen and oxygen is spilling into space, scientists will be able to look into why Mars lost so much of its early atmosphere and liquid water.
- It is expected to create the first complete portrait of the planet’s atmosphere.
- With the information gathered during the mission, scientists will have a better understanding of the climate dynamics of different layers of Mars’ atmosphere.
Mars
- Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, being larger than only Mercury.
- In English, Mars carries the name of the Roman god of war and is often referred to as the “Red Planet”.
- The latter refers to the effect of the iron oxide prevalent on Mars’s surface, which gives it a reddish appearance distinctive among the astronomical bodies visible to the naked eye.
- Mars is a terrestrial planet with a thin atmosphere, with surface features reminiscent of the impact craters of the Moon and the valleys, deserts and polar ice caps of Earth.
- The days and seasons are comparable to those of Earth, because the rotational period, as well as the tilt of the rotational axis relative to the ecliptic plane, is similar.
- Mars is the site of Olympus Mons, the largest volcano and highest known mountain on any planet in the Solar System, and of Valles Marineris, one of the largest canyons in the Solar System.
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From UPSC perspective, the following things are important :
Prelims level: Pegasus
Mains level: Whatsapp snooping
An online database about the use of the spyware Pegasus was recently launched by the Forensic Architecture, Amnesty International and the Citizen Lab to document attacks against human rights defenders.
What is Pegasus?
- Last year, one of the biggest stories that broke into cyberspace was WhatsApp’s reports that 1,400 of its users were hacked by Pegasus, a spyware tool from Israeli firm NSO Group.
- All spyware do what the name suggests — they spy on people through their phones.
- Pegasus works by sending an exploit link, and if the target user clicks on the link, the malware or the code that allows the surveillance is installed on the user’s phone.
- A presumably newer version of the malware does not even require a target user to click a link.
- Once Pegasus is installed, the attacker has complete access to the target user’s phone.
Why is Pegasus dangerous?
- What makes Pegasus really dangerous is that it spares no aspect of a person’s identity. It makes older techniques of spying seem relatively harmless.
- It can intercept every call and SMS, read every email and monitor each messaging app.
- Pegasus can also control the phone’s camera and microphone and has access to the device’s location data.
- The app advertises that it can carry out “file retrieval”, which means it could access any document that a target might have stored on their phone.
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From UPSC perspective, the following things are important :
Prelims level: Creation of new ministry
Mains level: Cooperatives in India
The Union Government has created a new Ministry of Cooperation with an aim to strengthen the cooperative movement in the country.
With the creation of the Ministry of Cooperation, there will now be a total of 41 central government ministries. Several of these ministries also have separate departments and organizations under them.
What defines a Cooperative?
- A cooperative is “an autonomous association of persons united voluntarily to meet their common economic, social, and cultural needs and aspirations through a jointly-owned enterprise”.
- Cooperatives are democratically owned by their members, with each member having one vote in electing the board of directors.
Ministry of Cooperation
- The ministry has been created for realizing the vision of ‘sahkar se samriddhi’ (through cooperation to prosperity).
- The NGO Sahakar Bharati, whose founder member Satish Kashinath Marathe is a part-time director on the RBI board, says it was the first to pitch for the creation of a separate ministry for the cooperative sector.
- It will provide a separate administrative, legal and policy framework for strengthening the cooperative movement in the country.
- It will help deepen cooperatives as a true people-based movement reaching up to the grassroots.
- The ministry will work to streamline processes for ‘ease of doing business’ for cooperatives and enable the development of multi-state cooperatives (MSCS).
Why need such Ministry?
- In our country, a Co-operative based economic development model is very relevant where each member works with a spirit of responsibility.
- This creation has signalled its deep commitment to community-based developmental partnerships.
Second new ministry created so far
- The Ministry of Cooperation is the second ministry to be created since 2019 after the Modi government came to power for the second time.
- Soon after taking charge, the government had created the Jal Shakti ministry.
- However, it was not altogether new as the Ministry of Cooperation.
- It was created by integrating two existing ministries dealing with water — Water Resources, River Development and Ganga Rejuvenation, and Drinking Water & Sanitation ministry.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Sir Chettur Sankaran Nair
Mains level: Not Much
A noted filmmaker has recently announced his decision to produce the biopic of Sir Chettur Sankaran Nair, an acclaimed lawyer and judge in the Madras High Court and one of the early builders of the Indian National Congress.
Sir Chettur Sankaran Nair
- Nair was born in the year 1857 in Mankara village of Malabar’s Palakkad district.
- He belonged to an aristocratic family and his great grandfather was employed by the East India Company to enforce peace in the Malabar region.
- His grandfather was employed as the chief officer under the Civilian Divisional Officer.
His legal career
- Nair was drawn towards Law while he was completing his graduation from Presidency College in Madras.
- After completing his degree in Law, he was hired by Sir Horatio Shepherd who later became the Chief Justice of the Madras High Court.
- Since his early days as a lawyer, Nair was known for his defiant attitude.
- He went against a resolution passed by Indian vakils (advocates) of Madras stating that no Indian vakil would work as a junior to an English barrister.
- His stance on the issue made him so unpopular that he was boycotted by the other vakils, but he refused to let that bother him.
Legacy
- Nair was known for being a passionate advocate for social reforms and a firm believer in the self-determination of India.
- But what really stood out in his long glorious career is a courtroom battle he fought against the Lieutenant-Governor of Punjab, Michael O’Dwyer.
- Nair had accused O’Dwyer in his book, ‘Gandhi and anarchy’ for being responsible for the atrocities at the Jallianwala Bagh massacre.
- Consequently, he was fighting against an Englishman, in an English court that was presided over by an English jury.
- In all senses, the case was bound to make history.
- When the 1908 Montague-Chelmsford reforms were being discussed, he wrote an article in the Contemporary Review criticizing the English jury for being partial towards Englishmen.
- This infuriated the Anglo-Indian community who petitioned the Viceroy and the Secretary of State for India objecting to his appointment as high court judge the first time.
- He was once described by Edwin Montague, the secretary of state for India as an ‘impossible person’.
Key positions held
- In 1897 he became the youngest president of the INC in the history of the party till then, and the only Malayali to hold the post ever.
- By 1908 he was appointed as a permanent judge in the Madras High Court. In 1902 Lord Curzon appointed him a member of the Raleigh University Commission.
- In 1904 he was appointed as Companion of the Indian Empire by the King-Emperor and in 1912 he was knighted.
- In 1915 he became part of the Viceroy’s Council, put in charge of the education portfolio.
Career as judge
- As a Madras High Court judge, his best-known judgments clearly indicate his commitment to social reforms.
- In Budasna v Fatima (1914), he passed a radical judgement when he ruled that those who converted to Hinduism cannot be treated as outcasts.
- In a few other cases, he upheld inter-caste and inter-religious marriages.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Last Ice Area
Mains level: Climate Change
A part of the Arctic’s ice called the “Last Ice Area”, located north of Greenland, has melted before expected. Scientists had believed this area was strong enough to withstand global warming.
What is the Last Ice Area?
- In an article published in 2015, National Geographic noted that climate projections forecast the total disappearance of summer ice in the Arctic by the year 2040.
- However, the only place that would be able to withstand a warming climate would be this area of ice called the “Last Ice Area”.
- But while this piece of ice above northern Canada and Greenland was expected to last the longest time, it is now showing signs of melting.
- WWF claims that WWF-Canada was the first to call this area the‘ Last Ice Area’.
Why is the area important?
- The area is important because it was thought to be able to help ice-dependent species as ice in the surrounding areas melted away.
- The area is used by polar bears to hunt for seals who use ice to build dens for their offspring.
- Walruses too, use the surface of the ice for food search.
When did the area start changing?
- The first sign of change in LIA was observed in 2018.
- Further, in August last year, sea ice showed its “vulnerability” to the long-term effects of climate change.
- The ice in LIA has been thinning gradually over the years much like other parts of the Arctic Ocean.
What are the reasons that explain the change?
- About 80 per cent of thinning can be attributed to weather-related factors such as winds that break up and move the ice around.
- The remaining 20 per cent can be attributed to the longer-term thinning of the ice due to global warming.
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From UPSC perspective, the following things are important :
Prelims level: Not much
Mains level: World History: India's contribution in two World Wars
During his four-day visit to the UK and Italy, the Indian Army Chief will inaugurate the Indian Army Memorial at Cassino in Italy, about 140 km away from Rome.
What is the memorial about?
- The memorial commemorates over 3,100 Commonwealth servicemen who took part in the effort to liberate Italy in World War II.
- Apart from this, 900 Indian soldiers were also commemorated on this memorial.
What was happening in Italy in WWII?
- Under Benito Mussolini, Italy had joined Nazi Germany in 1936 and in 1940 it entered WWII (1939-1945) against the Allies.
- But in 1943, Mussolini was overthrown and instead, Italy declared war on Germany.
- The invasion of Italy by the Allies coincided with an armistice that was made with the Italians.
- Even so, the UK’s National Army Museum notes that for two years during WWII, Italy became one of the war’s most “exhausting campaigns” because they were facing a skilled and resolute enemy.
What was India’s involvement in World War II?
- In the first half of the 1940s, India was still under British rule and the Indian Army fought in both the world wars.
- It comprised both Indian and European soldiers.
- Apart from this, there was the East India Company Army that also recruited both Indian and European soldiers and the British Army, which was also present in India.
India the largest volunteer
- Indian Army was the largest volunteer force during WWII, with over 2.5 million (more than 20 lakh) Indians participating.
- These troops fought the Axis powers (Germany, Italy and Japan) as part of the Allies.
- By 1945, the Allies had won, Italy had been liberated, Adolf Hitler was dead and India was barely a couple of years short of independence.
- However, while millions of Indians participated, their efforts are not always recognized.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Neutron star, Black Holes
Mains level: Gravitational waves observation
In an entirely strange phenomenon, astronomers have spotted two neutron stars being swallowed by different black holes.
What are Black Holes?
- A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.
- Neutron stars and black holes are among the most extreme objects in the universe. They are the fossil relics of massive dead stars.
- When a star that is more than eight times as massive as the Sun runs out of fuel, it undergoes a spectacular explosion called a supernova.
- What remains can be a neutron star or a black hole.
There is no upper limit to how massive a black hole can be, but all black holes have two things in common: a point of no return at their surface called an “event horizon”, from which not even light can escape and a point at their centre called a “singularity”, at which the laws of physics as we understand them break down.
What about Neutron stars?
- Neutron stars are typically between 1.5 and two times as massive as the Sun but are so dense that all their mass is packed into an object the size of a city.
- At this density, atoms can no longer sustain their structure and dissolve into a stream of free quarks and gluons: the building blocks of protons and neutrons.
What is the news observation?
- Gravitational waves are produced when celestial objects collide and the ensuing energy creates ripples in the fabric of space-time which carry all the way to detectors on Earth.
- The reverberations from the two celestial objects were picked up using a global network of gravitational wave detectors.
What makes this strange phenomenon?
- This is the first time scientists have seen gravitational waves from a neutron star and a black hole.
- Previous gravitational wave detections have spotted black holes colliding, and neutron stars merging but not one of each.
Why study this?
- Neutron star-black hole systems allow us to piece together the evolutionary history of stars.
- Gravitational-wave astronomers are like stellar fossil-hunters, using the relics of exploded stars to understand how massive stars form, live and die.
Answer this PYQ in the comment box:
Q.“Event Horizon” is related to (CSP 2018):
(a) Telescope
(b) Black hole
(c) Solar glares
(d) None of the above
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Fukuoka Prize
Mains level: Not Much
Noted journalist P. Sainath has been selected as one of the three recipients of the Fukuoka Prize for 2021.
Fukuoka Prize
- The Fukuoka Prize is given annually to distinguished people to foster and increase awareness of Asian cultures, and to create a broad framework of exchange and mutual learning among the Asian people.
- The Prize was established in 1990 by the city of Fukuoka in Japan and the Fukuoka City International Foundation.
- The Grand Prize has earlier been awarded to Muhammad Yunus from Bangladesh, historian Romila Thapar, and sarod maestro Amjad Ali Khan. Eleven Indians have received the Fukuoka Prize so far.
- 115 people from 28 countries and areas have received the Prize in the past 30 years.
Citation for the award
- In a statement issued Mr. Sainath was described as a “very deserving recipient of the Grand Prize of Fukuoka Prize”.
- The Secretariat noted his work for creating a new form of knowledge through his writings and commentaries on rural India and for “promoting civil cooperation”.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Stone age man and his evolution
Mains level: Not Much
Scientists have announced that a skull discovered in northeast China represents a newly discovered human species they have named Homo longi, or “Dragon Man”.
Answer this PYQ in the comment box:
Q.The word ‘Denisovan’ is sometimes mentioned in media in reference to (CSP 2019):
(a) fossils of a kind of dinosaurs
(b) an early human species
(c) a cave system found in North-East India.
(d) a geological period in the history of Indian subcontinent
Who is the “Dragon Man”, the latest Chinese discovery?
- The cranium found in China has been dubbed the “Dragaon Man” or Homo longi, a name that has been derived from the Long Jiang or Dragon River in the Heilongjiang province of China where the city of Harbin is located.
- The skull was reportedly discovered back in 1933, when a bridge was built over the Songhua River.
- For thousands of years, the skull remained buried in sediments.
- Because of the distinctive shape of the skull, which was found almost complete, some members of the team have suggested that it be declared a part of a new species of the genus Homo.
- Significantly, the size of the skull, which has a considerable brain capacity, is comparable to that of modern humans and Neanderthals.
Why is this discovery being considered significant?
- For one, it brings new knowledge about the evolution of Homo sapiens.
- It might help to bridge the gaps between our ancient ancestors called Homo erectus and us.
- This knowledge is important because there is very little consensus in the scientific community about how different human species are related, and which species are our immediate ancestors.
- Smithsonian for instance notes that some palaeontologists believe Homo heidelbergensis to be our immediate ancestors.
- This species was discovered in 1908, and lived about 700,000 to 200,000 years ago in Europe and possibly China and some parts of Africa.
Back2Basics: Species of Humans
- Modern humans are the only human species that exist in the world today.
- While the exact number of human species is a matter of debate, most scientists believe that there are at least 21 of them.
As per the Smithsonian National Museum of Natural History, there are over 21 human species. Major among these are:
(1) Sahelanthropus tchadensis
- Sahelanthropus tchadensis is believed to be the oldest member of the human family tree.
- It lived about 7-6 million years ago somewhere around present-day Chad in Africa.
- It had both ape-like and human-like features and was bipedalled, an ability that may have increased its chances of survival.
(2) Homo erectus
- Homo erectus lived about 1.89 million-110,000 years ago, in Northern, Eastern, and Southern Africa and Western and East Asia.
- ‘Turkana Boy’ is the most complete fossil belonging to this species and is dated to be around 1.6 million years old.
(3) Modern man
- Homo neanderthalensis lived about 400,000-40,000 years ago and co-existed with Homo sapiens for a few thousand years.
- They lived in Europe and in southwestern and central Asia.
- Homo sapiens evolved about 300,000 years ago, and are found worldwide.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Full Ship Shock Trial (FSST)
Mains level: Not Much
The US Navy Friday carried out a ‘full ship shock trial’ on its newest and most advanced nuclear-powered aircraft carrier to ensure its hardness was capable of withstanding battle conditions.
What is a Full Ship Shock Trial (FSST)?
- During World War II, American warships suffered severe damage from enemy mines and torpedoes that had actually missed their target, but exploded underwater in close proximity.
- The US Navy has since worked to improve the shockproofing of their ship systems to minimize damage from such “near miss” explosions.
- In FSSTs, an underwater explosive charge is set off near an operational ship, and system and component failures are documented.
- The FSST probes whether the components survive shock in their environment on the ship; it probes the possibilities of system failures, and large components that could not be otherwise tested.
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