PYQ Relevance:
Question: What is the significance of Indo-US defence deals over Indo-Russian defence deals? Discuss with reference to stability in the Indo-Pacific region. (UPSC 2020)
Linkage: This question linked with the growing technological reliance on the U.S. in a critical area of India’s defense. India’s future military capabilities might depend on how the U.S. values India in its strategic plans. |
Mentor’s Comment: India’s defence public sector undertakings primarily serve the armed forces, making them heavily dependent on state-run manufacturers. The Aatmanirbhar Bharat initiative has further increased this reliance, adding pressure on the Indian Air Force (IAF), which is struggling with a declining squadron strength due to Hindustan Aeronautics Limited’s (HAL) slow production. After the IAF chief raised concerns at Aero India-2025, efforts were promised to speed up Tejas Mk1A fighter jet deliveries. A private company recently built the first rear fuselage for Tejas, marking progress. Meanwhile, the Defence Ministry is reviewing a report on the IAF’s requirements, including potential imports.
Today’s editorial examines India’s defense sector and its reliance on other countries. This analysis is useful for GS Paper 2 and 3 in the UPSC Mains.
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Let’s learn!
Why in the News?
Recently, the IAF chief raised concerns at Aero India-2025, efforts were promised to speed up Tejas Mk1A fighter jet deliveries.
What are the key concerns of the Indian Air Force (IAF) regarding the dependence on Hindustan Aeronautics Limited (HAL) for fighter aircraft production?
- Production Delays – HAL’s slow manufacturing rate has led to a depletion of IAF’s squadron strength, impacting operational readiness. Example: Delay in the production of Tejas MK1A jets has strained the IAF’s fighter jet availability.
- Over-Reliance on a Single PSU – The IAF lacks alternative domestic suppliers, making it dependent on HAL despite inefficiencies. Example: Limited private sector involvement has only recently started with private firms producing Tejas components.
- Quality and Upgradation Issues – HAL’s track record in upgrading older aircraft and ensuring high-quality production has been inconsistent. Example: Issues with Sukhoi Su-30MKI maintenance and Tejas Mk1A’s delayed improvements.
What are the concern related to reliability of India’s strategic partnership with the United States in the defense sector?
- Policy Volatility and Shifting Alliances – The U.S. has a history of changing its foreign policy based on geopolitical interests, making long-term defense commitments uncertain.Example: The U.S.-Pakistan alliance weakened when Washington’s strategic focus shifted, leading to reduced military support for Islamabad.
- Dependency on Critical Components – India’s indigenous fighter programs, like Tejas Mk2 and AMCA, rely on American engines, creating a risk of supply disruptions due to geopolitical tensions.Example: The U.S. previously blocked the supply of F414 jet engines to Turkey, highlighting the risks of dependency.
- Short-Lived Defense Initiatives – Several past U.S.-India defense agreements have not led to meaningful technology transfers or long-term collaboration. Example: The 2012 ‘Defense Technology and Trade Initiative’ (DTTI) promised cutting-edge tech transfer but failed to deliver substantial results.
How does the SIPRI report reflect India’s position in global arms imports?
- Second-Largest Arms Importer – India remains the world’s second-largest arms importer, reflecting its continued reliance on foreign defense equipment despite domestic production efforts. Example: The Stockholm International Peace Research Institute (SIPRI) report (2020-24) highlights that India’s arms imports still dominate globally, second only to Saudi Arabia.
- Decline in Imports but Persistent Dependence – India’s arms imports decreased by 9.3% compared to 2015-19, but high-value systems like fighter jets, tanks, and missile defense systems continue to be sourced from abroad. Example: India imports S-400 missile systems from Russia and MQ-9B drones from the U.S., showing that critical defense needs are still met through foreign procurement.
- Shift in Supplier Dynamics – While Russia remains India’s largest arms supplier, its share in Indian imports has decreased, with the U.S., France, and Israel gaining ground. Example: The Rafale jets from France and MH-60R Seahawk helicopters from the U.S. demonstrate India’s diversification in defense partnerships.
Who benefits from India’s indigenous fighter production, and what risks remain in foreign dependency?
| Beneficiaries of India’s Indigenous Fighter Production |
Description |
Example |
| Indian Armed Forces |
Ensures timely supply, reduces reliance on imports, and enhances operational preparedness. |
Tejas Mk1A, developed by HAL, offers a modern, cost-effective alternative to imported jets. |
| Indian Defense Industry & Economy |
Boosts domestic manufacturing, generates employment, and fosters R&D in advanced technologies. |
Private firms like Tata Advanced Systems and L&T contribute to fighter jet production, strengthening India’s defense sector. |
| Strategic Autonomy & Geopolitical Leverage |
Reduces dependence on foreign suppliers, allowing independent defense decisions. |
BrahMos missile production (India-Russia collaboration) enables exports, enhancing global influence. |
| Risks of Foreign Dependency |
Description |
Example |
| Supply Chain Vulnerabilities |
Dependence on foreign components (e.g., engines, avionics) can lead to disruptions during geopolitical tensions. |
Tejas Mk1A and AMCA jets rely on U.S. GE-F404 and GE-F414 engines, making supply uncertain due to policy shifts. |
| Technology Denial & Cost Escalation |
Foreign suppliers may withhold critical technologies or impose high costs for upgrades and maintenance. |
U.S. sanctions after India’s 1998 nuclear tests restricted access to crucial defense tech, impacting the LCA Tejas program. |
| Strategic Dependence & Policy Uncertainty |
Over-reliance on a single country can compromise strategic autonomy. |
The U.S. restricted F-16 spare parts supply to Pakistan during strained relations, a risk India could face with any single defense partner. |
Where does India stand in balancing defense partnerships while maintaining strategic autonomy? (Way forward)
- Diversification of Defense Suppliers – India sources military equipment from multiple countries to avoid over-reliance on any single nation.Example: India procured S-400 missile systems from Russia, Rafale jets from France, and MH-60R Seahawk helicopters from the U.S., ensuring flexibility in its defense strategy.
- Indigenous Defense Development – India is focusing on self-reliance through initiatives like Aatmanirbhar Bharat, reducing long-term dependency on foreign suppliers. Example: The development of Tejas Mk1A fighter jets, Advanced Medium Combat Aircraft (AMCA), and BrahMos missile systems (jointly developed with Russia) aims to strengthen indigenous capabilities.
- Strategic Alliances Without Military Alignment – India engages in defense collaborations without entering formal military alliances, ensuring diplomatic flexibility. Example: While India has signed defense agreements with the U.S. (BECA, LEMOA, COMCASA) and conducts military exercises like Malabar with the Quad nations, it remains non-aligned, maintaining its independent foreign policy.
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Note4Students
From UPSC perspective, the following things are important :
Mains level: Issues related to border security;
Why in the News?
In February 2024, Union Home Minister Amit Shah announced plans to end the Free Movement Regime (FMR) along the Myanmar border. However, so far, there has been no official notification from the Ministry of External Affairs or any formal agreement with Myanmar on this matter.
What are the historical and socio-cultural reasons behind the implementation of the Free Movement Regime (FMR) along the India-Myanmar border?
- Ethnic and Familial Ties Across the Border: The India-Myanmar border cuts across communities with shared ancestry, language, and traditions. Ethnic groups such as the Chin, Mizo, Kuki, and Naga tribes live on both sides and consider themselves part of the same cultural identity.
- Example: The Mizo people in Mizoram and the Chin people in Myanmar share deep kinship ties and often intermarry, making border restrictions impractical for their social and economic interactions.
- Pre-Colonial Trade and Historical Linkages: Before colonial rule, there were no rigid boundaries, and people freely moved for trade, festivals, and religious practices. The FMR formalized this long-standing tradition.
- Example: The Naga tribes have historically maintained trade and social connections between Nagaland and the Sagaing Region of Myanmar, exchanging goods such as textiles, salt, and agricultural produce.
- Post-Independence Border Division Without Local Consent: The Indo-Myanmar border was drawn by the British without consulting local communities, splitting ethnic groups across two nations. The FMR was introduced in 1968 to ease movement and mitigate the negative impact of artificial boundaries.
- Example: The Kuki and Zomi tribes in Manipur and Myanmar continue to see themselves as a single community despite the international border, and FMR allows them to maintain their cultural and familial ties.
Why do Mizoram and Nagaland oppose scrapping the FMR, while Manipur supports it?
- Reasons for Opposition (Mizoram & Nagaland)
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- Ethnic & Cultural Ties: The Mizo and Naga communities share deep historical and familial ties with tribes across the Myanmar border. Example: Many Mizos have Chin relatives in Myanmar, and restricting movement disrupts social and economic relations.
- Humanitarian Concerns: Mizoram and Nagaland emphasize providing refuge to Myanmar nationals fleeing conflict and persecution. Example: Mizoram has sheltered thousands of Chin refugees since the military coup in Myanmar (2021).
- Economic & Livelihood Impact: Many border communities depend on cross-border trade and traditional exchanges. Example: Mizoram’s barter trade with Myanmar sustains rural economies.
- Reasons for Support (Manipur)
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- Security Concerns: Manipur sees unrestricted movement as a risk to security, citing arms smuggling and insurgency threats. Example: The state government has linked rising violence to unchecked cross-border infiltration.
- Demographic & Political Factors: Manipur fears an influx of migrants could alter its demographic balance and strain resources. Example: Tensions have risen between local communities and Kuki-Zo refugees from Myanmar.
What challenges does the Indian government face in implementing border fencing along the 1,653-km-long India-Myanmar border?
- Ethnic and Tribal Opposition: Several ethnic groups, such as the Nagas, Kukis, Mizos, and Chins, have strong familial and cultural ties across the border. Fencing would disrupt their traditional movement and economic activities.
- Difficult Terrain and Dense Forests: The India-Myanmar border passes through hilly terrain, dense forests, and riverine areas, making it logistically challenging to construct and maintain a continuous fence. Example: The rugged terrain of Manipur’s Moreh-Tamu sector complicates infrastructure development and patrolling efforts.
- Security and Insurgency Issues: The region is home to various insurgent groups, including NSCN-K (Naga), PLA (Manipur), and Chin National Army (Myanmar), who use the porous border for movement and arms smuggling. Fencing alone may not curb insurgency without enhanced intelligence and cooperation with Myanmar.
- Example: The Manipur-based People’s Liberation Army (PLA) has reportedly used Myanmar as a base for launching attacks in India.
- Impact on Free Movement Regime (FMR): The Free Movement Regime (FMR) allows people from border villages to travel up to 16 km inside each other’s territory without a visa. Fencing would disrupt this agreement, leading to resistance from local communities and potential diplomatic strain with Myanmar.
- Example: The border trade hub of Moreh (Manipur) and Tamu (Myanmar) benefits from FMR, and restrictions could harm livelihoods.
- High Financial and Maintenance Costs: Constructing a fence across 1,653 km of difficult terrain requires massive financial investment and continuous maintenance due to landslides, heavy rainfall, and natural degradation.
- Example: The fencing project in Manipur was delayed multiple times due to cost escalations and environmental challenges, making large-scale fencing impractical.
What alternatives balance national security and border community interests instead of scrapping the FMR? (Way forward)
- Strengthening Smart Surveillance and Border Management: Deploying technology-driven surveillance (such as drones, infrared sensors, and biometric tracking) can help secure the border without disrupting traditional movement.
- Example: India has successfully used the Comprehensive Integrated Border Management System (CIBMS) along the India-Bangladesh border, which could be adapted for the India-Myanmar border.
- Regulated Border Trade and Movement Checkpoints: Instead of a blanket ban, regulated border entry points with biometric verification can ensure security while allowing legal movement under the FMR. More trade facilitation centers can also boost local economies.
- Example: The Moreh-Tamu border trade point in Manipur enables legitimate economic exchanges while maintaining oversight over cross-border movement.
- Enhanced Cooperation with Myanmar for Joint Patrolling: Strengthening bilateral cooperation for joint border patrolling and intelligence sharing can help curb insurgency and illegal activities while maintaining local mobility.
Mains PYQ:
Question: Analyze internal security threats and transborder crimes along Myanmar, Bangladesh and Pakistan borders including Line of Control (LoC). Also discuss the role played by various security forces in this regard. (UPSC 2020)
Linkage: This question linked India Myanmar border issues. It requires an analysis of these issues specifically concerning the Indo-Myanmar border and the role of security forces in managing them.
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Note4Students
From UPSC perspective, the following things are important :
Mains level: Regulation of online content;
Why in the News?
Social media platform X told the Delhi High Court that it cannot be forced to join the government’s SAHYOG portal, raising concerns that the portal might be misused to restrict online content.
What is the SAHYOG portal?
- The SAHYOG portal is an initiative by India’s Ministry of Home Affairs designed to streamline the process of identifying and removing unlawful online content.
- It serves as a centralized platform that connects authorized government agencies with online intermediaries, such as social media platforms, to facilitate the automated issuance of notices under the Information Technology Act, 2000.
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How does the government justify the creation of SAHYOG portal?
- Enhancing Law Enforcement Efficiency: The government argues that SAHYOG enables faster coordination between law enforcement agencies, social media platforms, and telecom providers to remove unlawful content swiftly. Example: During communal riots, law enforcement can quickly flag and remove misinformation that could incite violence.
- Legal Obligation Under IT Act: The government justifies SAHYOG under Section 79(3)(b) of the IT Act, which mandates that intermediaries remove content upon receiving government notification to retain their safe harbour protection. Example: If a government agency reports a post promoting terrorism, the platform must take it down to comply with the law.
- Court-Mandated Need for Real-Time Action: The government cites the Delhi High Court’s observation in Shabana vs Govt of NCT of Delhi and Ors., which highlighted the necessity of a real-time content removal mechanism to handle urgent cases. Example: In cases of child exploitation content, immediate action through SAHYOG ensures rapid takedown and prevents further harm.
Why has X (formerly Twitter) challenged the SAHYOG portal in the Delhi High Court?
- Existence of an Independent Mechanism: X asserts that it has its own system to process valid legal requests for content removal and cannot be compelled to join the SAHYOG portal.
- Legal Concerns Over Parallel Mechanisms: The company argues that the SAHYOG portal creates a parallel content removal mechanism without the stringent legal safeguards outlined in Section 69A of the Information Technology Act, 2000.
- Potential for Unchecked Censorship: X is concerned that the portal could lead to unrestrained censorship by allowing multiple government officials to issue content removal orders without proper oversight.
How does Section 79(3)(b) of the IT Act differ from Section 69A in terms of content takedown provisions?
| Aspect |
Section 79(3)(b) |
Section 69A |
| Nature of Obligation |
- Intermediaries (social media platforms, websites) must remove content if they have “actual knowledge” of illegality or receive a court/government order.
|
- The government can directly block content if it threatens national security, public order, or sovereignty.
|
| Who Issues Takedown Orders? |
- Takedown is required based on court orders or government notifications; intermediaries must act or lose their safe harbor protection.
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- Only the central government can order content blocking through a confidential process.
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| Legal Safeguards & Due Process |
- Provides some scope for judicial review, as takedown requests are often based on court rulings.
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- Decisions are made secretly by a government committee, limiting transparency and legal recourse.
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| Scope of Application |
- Applies broadly to any illegal content, including defamation, copyright violations, and hate speech.
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- Targets content affecting national security, public order, or friendly relations with foreign states.
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| Example Scenarios |
- If a court finds a defamatory post on social media, the platform must remove it.
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- The government can block TikTok or ban certain tweets for national security concerns (e.g., India’s TikTok ban in 2020).
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Who are the key stakeholders involved in the SAHYOG portal’s implementation and legal challenge?
- Government Authorities: The Ministry of Home Affairs (MHA) developed the SAHYOG portal to enhance coordination between law enforcement agencies and social media platforms for combating cybercrime. The portal aims to automate the process of sending notices to intermediaries for the removal or disabling of unlawful online content.
- Social Media Platforms (Intermediaries): Companies like X Corp (formerly Twitter) are directly impacted by the portal’s operations. X Corp has legally challenged the government’s use of the SAHYOG portal, arguing that it functions as a censorship tool by bypassing established legal safeguards and infringing upon constitutional rights such as freedom of speech.
- Judiciary: The Delhi High Court plays a pivotal role in adjudicating disputes related to the SAHYOG portal. It has urged various states, union territories, and intermediaries to join the portal to effectively combat cybercrime, while also addressing grievances from law enforcement agencies regarding data access from intermediaries.
Where does the Supreme Court’s ruling in Shreya Singhal vs Union of India come into play in the debate over SAHYOG?
- Precedent on Online Free Speech & Due Process: The Shreya Singhal ruling struck down Section 66A of the IT Act for being vague and overbroad, while upholding Section 69A with due process requirements, including hearings for content creators. Example: A journalist’s tweet flagged via SAHYOG may be removed without an opportunity to challenge it, violating Shreya Singhal principles.
- Judicial Safeguards & Preventing Arbitrary Censorship: Shreya Singhal upheld Section 69A but mandated transparent procedures, review committees, and justifications for content blocking. Example: If SAHYOG bulk blocks dissenting voices without an independent review, it could breach Shreya Singhal safeguards.
Way forward:
- Ensure Judicial Oversight & Accountability – Implement an independent review mechanism to prevent arbitrary censorship and align with the Shreya Singhal ruling.
- Enhance Transparency & Due Process – Mandate clear guidelines, periodic transparency reports, and an appeal system for content takedown decisions.
Mains PYQ:
Question: Discuss Section 66A of IT Act, with reference to its alleged violation of Article 19 of the Constitution. [UPSC 2013]
Linkage: This question linked with regulation of online content and the potential restrictions on freedom of speech and expression guaranteed by Article 19 of the Constitution. This is relevant because content takedown provisions are also a form of regulating online speech and need to be consistent with constitutional rights.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Rana Sanga
Why in the News?
A recent statement by an MP in Parliament labelling Rajput ruler Rana Sanga a “traitor,” has sparked controversy over his role in inviting Babur to invade India.
Who was Rana Sanga?
- Rana Sanga, also known as Maharana Sangram Singh, was a Rajput king who ruled the kingdom of Mewar in present-day Rajasthan from 1509 to 1527.
- He expanded his kingdom significantly, conquering parts of Madhya Pradesh, Gujarat, Haryana, and Sindh.
- He formed a powerful Rajput confederacy and led a massive army of 80,000 warhorses and 500 elephants.
- He was known for his military campaigns against the Lodi dynasty of Delhi, the Sultanates of Malwa and Gujarat, and even the Mughals.
- His most notable victories include the Battle of Gagron against Sultan Mahmud Khilji of Malwa and the Battle of Dholpur in 1519 against Ibrahim Lodi of Delhi.
- Battle with Babur:
- Rana Sanga eventually came into conflict with Babur, the founder of the Mughal Empire.
- The two fought in the Battle of Khanwa in 1527, where Babur’s forces defeated Sanga’s Rajput army.
- This marked the end of Rajput resistance to the Mughals in Northern India.
- Legacy:
- Despite his defeat at Khanwa, he is remembered as a hero of Rajput resistance and is considered one of the last independent Hindu rulers in Northern India before the rise of Mughal dominance.
Recent Controversy:
- The remarks were made amid growing debates about Medieval Indian history, particularly surrounding Aurangzeb and the role of various historical figures in Indian politics.
- Historians are divided on whether Rana Sanga explicitly invited Babur to invade India.
- Babur’s memoirs, the Baburnama, mention that Rana Sanga offered assistance against Ibrahim Lodi.
- Yet, historians like Satish Chandra propose that Rana Sanga might have viewed Babur as a means to weaken the Lodi Sultanate, possibly underestimating Babur’s intentions to establish his own rule in India.
- Some argue that Rana Sanga might have seen Babur as a useful ally against Ibrahim Lodi, while others believe his role was exaggerated by Babur in his memoir, the Baburnama.
| [UPSC 2023] With reference to the Mughal Empire, which one of the following statements is NOT correct?
(a) Mughal officials who were in charge of land revenue were known as Karoris.
(b) The term ‘Jagirdar’ was used for the holders of revenue assignments.
(c) The office of ‘Mir Bakshi’ was related to the imperial household.
(d) The Rajput chiefs were integrated into the Mughal nobility. |
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Section 44(3)
Why in the News?
Opposition parties have raised concerns over the Digital Personal Data Protection (DPDP) Act, 2023, demanding the repeal of Section 44(3), claiming it could undermine the Right to Information (RTI) Act, 2005.
About DPDP Act and Section 44(3)
- Recognizing the right to privacy as fundamental in India, the Supreme Court in Justice K.S. Puttaswamy vs. Union of India (2017) led to the introduction of the DPDP Act in 2023.
- The Act regulates the processing of personal data, balancing individual privacy rights and lawful processing needs.
- Key Provisions: It mandates informed consent, establishes a Data Protection Board of India (DPBI), and outlines the responsibilities of data fiduciaries in ensuring data protection.
- Section 44(3) modifies Section 8(1)(j) of the RTI Act, which previously exempted personal information from disclosure unless public interest justified it.
- The amendment broadens this exemption, stating that all personal information should be exempt from disclosure, without requiring a public interest justification.
Concerns Related to Section 44(3)
- Reduced Transparency: Activists and critics argue that this section undermines the RTI Act, which has been a cornerstone of transparency and accountability in governance.
- Limited Access to Public Information: The broad exemption allows government officials to shield information like asset disclosures, which are critical for public accountability.
- Potential for Misuse: There are concerns that personal data protection could be used as an excuse to block vital information about government activities, weakening the public’s right to know.
- Conflict Between Public Interest and Privacy: Critics argue that privacy protection should not override the principle of transparency.
Back2Basics: Right to Information (RTI) Act, 2005
- The RTI Act, 2005 empowers Indian citizens to seek information from public authorities, ensuring transparency and accountability in governance.
- RTI is considered a fundamental right under Article 19(1)(a) of the Indian Constitution, which guarantees freedom of speech and expression,
- Key Features:
- Applicability: Covers all government bodies, including central, state, and local authorities.
- Public Information Officers (PIOs): Designated officials who are responsible for providing requested information within 30 days.
- Exemptions: Some categories of information are exempted, such as national security matters and personal privacy.
- Penalty: Officials can face fines for failing to provide information without valid reasons.
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| [UPSC 2018] Right to Privacy is protected as an intrinsic part of Right to Life and Personal Liberty. Which of the following in the Constitution of India correctly and appropriately imply the above statement?
(a) Article 14 and the provisions under the 42ndAmendment to the Constitution.
(b) Article 17 and the Directive Principles of State Policy in Part IV.
(c) Article 21 and the freedoms guaranteed in Part III.
(d) Article 24 and the provisions under the 44thAmendment to the Constitution. |
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: India BioEconomy Report
Why in the News?
The India BioEconomy Report has pegged the value of India’s bioeconomy in 2024 at more than $165 billion, accounting for over 4.2% of the country’s GDP.
What is Bioeconomy?
- Bioeconomy refers to the industrial use of biological resources (plants, animals, and microorganisms) and the replication of natural biological processes to produce goods and services.
- It incorporates sustainable methods to replace traditional, resource-intensive production systems.
- Applications:
- Biofuels, bioplastics, medicines, synthetic biology, and agriculture are key sectors where bioeconomy is being applied.
- Ex. Ethanol produced via microorganisms from crops like sugarcane and corn is a prime example of bioeconomy’s impact on reducing reliance on hydrocarbon-based fuels.
Key Highlights of the India Bioeconomy Report:
- Growth in Market Value:
- India’s bioeconomy has nearly doubled in value from $86 billion in 2020 to $165 billion in 2024.
- There has been a 90% increase in the number of companies in the bioeconomy sector, from 5,365 in 2021 to 10,075 in 2024, with projections to double again by 2030.
- Key Sectors:
- Industrial Sector: Contributes nearly $78 billion, driven by biofuels and bioplastics.
- Pharmaceuticals: Accounts for 35% of the total bioeconomy value, primarily driven by vaccines.
- Research and IT: The fastest-growing segment, especially in biotech software development and clinical trials.
- Regional Contribution:
- Maharashtra, Karnataka, Telangana, Gujarat, and Andhra Pradesh account for over two-thirds of the bioeconomy value.
- The Eastern and Northeastern regions contribute less than 6%.
- Global Comparison:
- India’s bioeconomy share in GDP (4.2%) is comparable to countries like the US and China.
- However, countries like Spain and Italy have bioeconomy contributing more than 20% of their GDP.
- Policy Direction:
- The BioE3 policy (Biotechnology for Economy, Environment, and Employment), launched in 2024, aims to establish India as a global hub for bio-manufacturing and a major center for biotech R&D.
- The policy targets growth in areas such as bio-based chemicals, functional foods, precision biotherapeutics, marine and space biotechnology, and climate-resilient agriculture.
| [UPSC 2024] Consider the following materials:
1. Agricultural residues
2. Corn grain
3. Wastewater treatment sludge
4. Wood mill waste
Which of the above can be used as feedstock for producing Sustainable Aviation Fuel?
(a) 1 and 2 only (b) 3 and 4 only (c) 1,2,3 and 4 (d) 1,3 and 4 only |
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: GAIA Mission
Why in the News?
The European Space Agency (ESA) officially shut down its Global Astrometric Interferometer for Astrophysics (GAIA) Mission, which had been operational for over a decade.
About the GAIA Mission
- It was launched in December 2013 with the primary goal to create the most accurate three-dimensional map of the Milky Way galaxy.
- It sought to measure the positions, distances, and movements of stars and other celestial bodies.
- Gaia was designed for astrometry, focusing on precise measurements of celestial object locations and motions.
- Positioned at Lagrange Point 2 (L2), 1.5 million kilometres behind Earth (as viewed from the Sun), Gaia was able to observe the universe without interference from Earth, the Sun, or the Moon.
- Gaia was equipped with two telescopes and a camera with nearly 1 billion pixels, the largest camera ever sent to space. Key instruments include:
- Astrometer: Measured the location and motion of stars.
- Photometer: Measured brightness of celestial objects.
- Spectrometer: Analyzed the composition and movement of stars.
- Discoveries and Achievements:
- Gaia mapped the Milky Way in 3D, uncovering its shape, structure, and movement. It also detected warping and wobbling in the galaxy.
- Gaia identified new types of black holes by observing their gravitational effects and tracked over 150,000 asteroids, contributing insights on their orbits and future impacts on Earth.
- Additionally, it provided new understanding of stellar evolution and the formation of stars, including the Sun.
- Gaia accumulated over 3 trillion observations, contributing to more than 13,000 scientific papers, revolutionizing knowledge about the Milky Way, the solar system, and galactic dynamics.
Why is Gaia being Decommissioned?
- After more than a decade of operations, the Gaia mission reached the end of its operational lifespan, making it unsustainable to continue its activities.
- After over 10 years in space, Gaia’s technology showed signs of wear, and continuing operations became unfeasible.
- On March 27, 2025, Gaia was successfully passivated, draining all internal energy sources. This means it can no longer be restarted or resumed for future operations.
| [UPSC 2023] Consider the following pairs: Objects in space Description
1. Cepheids : Giant clouds of dust and gas in space
2. Nebulae : Stars which brighten and dim periodically
3. Pulsars : Neutron stars that are formed when massive stars run out of fuel and collapse
How many of the above pairs are correctly matched?
(a)Only one (b) Only two (c)All three (d) None |
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