Daily UPSC news analysis, 6 Oct 2026: Nobel for optogenetics, India–Switzerland ties, Great Nicobar, UDAN, Bab el-Mandeb, House privileges and more.

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Table of Contents

1. Optogenetics: How Scientists Used Light to Control Brain Cells

Syllabus: GS3 – Science & Technology (biotechnology, health)

Why in news: The 2026 Nobel Prize in Physiology or Medicine went to Karl Deisseroth (USA), Peter Hegemann and Georg Nagel (Germany), announced on 5 October 2026, for discoveries on light-gated ion channels that led to optogenetics.

What is optogenetics?

Optogenetics lets scientists switch individual nerve cells on or off in a living brain using flashes of light. It combines optics (light delivered through thin optical fibres) with genetics (inserting a gene for a light-sensitive protein into chosen neurons).

1. Find the switch: A green alga, Chlamydomonas reinhardtii, swims towards light using an eyespot. Hegemann and Nagel found the protein behind this, channelrhodopsin – an ion channel that opens when struck by light.
2. Insert the switch: Using a harmless virus, the gene for channelrhodopsin is delivered only into a selected type of neuron.
3. Flip the switch: Blue light opens the channel, positive ions rush in and the neuron fires. Other proteins, such as halorhodopsin, respond to yellow light and silence neurons.
4. Watch behaviour: Because the response takes milliseconds, researchers can link a specific cell type to a specific behaviour, memory or emotion.

Why it matters

• Brain mapping: Earlier tools – electrodes and drugs – could not target one cell type quickly and precisely. Optogenetics can.
• Medicine: It is used in research on Parkinson’s disease, depression, addiction, epilepsy and chronic pain. In 2021 it helped partly restore vision in a blind patient with retinitis pigmentosa.
• Limits: It needs gene delivery and light to reach deep tissue, so human therapy remains largely experimental; ethical questions on altering brain activity remain.

Key Facts for Prelims

2. India–Switzerland to Strengthen Ties in Defence and Nuclear Energy

Syllabus: GS2 – Bilateral relations; GS3 – Energy, Defence

Why in news: Swiss President Guy Parmelin began a three-day state visit to India on 5 October 2026 – his first state visit and second trip to India this year, after the AI Impact Summit in February. After talks, PM Narendra Modi said the two sides had identified new areas of cooperation in defence production, military exchanges and civil nuclear energy.

Outcomes of the visit

Five agreements were signed:

• A Migration and Mobility Partnership agreement, easing travel for students and professionals.
• A Young Professionals exchange scheme for short-term work experience.
• An agreement on transport technologies, mobility systems and infrastructure.
• Two other agreements (full list awaited from the MEA).

Both sides also agreed to widen Swiss market access for Indian exports. Switzerland pressed for an early Bilateral Investment Protection Agreement, since India’s earlier BIT with Switzerland lapsed in 2017. Ukraine and West Asia were also discussed.

Why it matters for India

• TEPA anniversary: The visit came a year after the India–EFTA Trade and Economic Partnership Agreement (TEPA) entered into force on 1 October 2025. EFTA has committed to USD 100 billion of investment and 1 million direct jobs in India over 15 years.
• Nuclear energy: Switzerland is a member of the Nuclear Suppliers Group (NSG) and backed India’s membership bid in 2016. Swiss precision engineering can support India’s target of 100 GW nuclear capacity by 2047 and the opening of the sector to private players.
• Defence: Swiss firms are strong in precision components, optics and drones – a fit for Make in India and defence exports.
• Neutrality and non-alignment: Swiss neutrality and India’s strategic autonomy give both a shared approach to the Ukraine and West Asia conflicts.

Key Facts for Prelims

3. Great Nicobar Project: SC Dismisses Centre’s Objection to PIL Maintainability in HC

Syllabus: GS3 – Environment, Infrastructure; GS2 – Judiciary, Tribal rights

Why in news: On 5 October 2026, a Bench of CJI Surya Kant, Justice Joymalya Bagchi and Justice V. Mohana refused to entertain the Centre’s challenge to a Calcutta High Court order. The HC had held that PILs alleging violations of the Forest Rights Act, 2006 in the Great Nicobar project were maintainable. The HC will hear all connected petitions on 25–26 November 2026.

The case in brief

• Petitioner: Former bureaucrat Meena Gupta, who argued that tribal consent for diverting forest land was not obtained properly.
• Centre’s objection: She lacked locus standi as she lives in Hyderabad, not in the islands; the affected tribes were not before the court; and the environmental clearance was already being examined by the National Green Tribunal.
• Calcutta HC (6 May 2026): No rigid “thumb rule” on locus standi in PILs, especially where vulnerable communities are involved. A project’s cost or national importance does not place it beyond judicial review.
• Supreme Court: Kept open the questions of how much public interest is involved and the scope of the petitions, but let the HC proceed.

About the Great Nicobar Project

The ₹72,000-crore project by NITI Aayog and ANIIDCO has four parts: an International Container Transshipment Terminal at Galathea Bay, a greenfield international airport, a 450 MVA gas-and-solar power plant, and a township. It needs about 130 sq km of forest land.

Key Facts for Prelims

4. West Bengal Signs UDAN Pact for 4 Airports; CM Blames Delay on Previous TMC Government

Syllabus: GS3 – Infrastructure (airports); GS2 – Centre–State relations

Why in news: On 5 October 2026, West Bengal, the Ministry of Civil Aviation and the Airports Authority of India (AAI) signed an MoU at Nabanna to implement UDAN in the state. Four airports will come up at Chharra (Purulia), Balurghat (Dakshin Dinajpur), Hasimara (Alipurduar) and Kalaikunda (Paschim Medinipur) within about two years.

Key points

• Union Civil Aviation Minister K. Rammohan Naidu said the Centre would spend ₹29,000 crore under UDAN in Bengal over ten years, and asked the state to frame a civil aviation policy.
• CM Suvendu Adhikari said the earlier TMC government’s failure to hand over land had stalled these airports and a second Kolkata airport. He sought full airports at Malda and Cooch Behar.
• Hasimara and Kalaikunda are Indian Air Force bases, so civil flights will run from civil enclaves there.
• Challenge: Cooch Behar, revived under UDAN in 2023, now has no regular commercial flight – a sign that UDAN routes often fail once the subsidy period ends.

UDAN: how the scheme works

1. Bidding: Airlines bid for unserved or under-served routes and quote the Viability Gap Funding (VGF) they need.
2. Fare cap: About half the seats are sold at capped fares for flights of roughly one hour.
3. Support: VGF is shared by the Centre (80%) and states (20%; 10% for North-East and UTs) for three years, plus cheaper fuel tax, free land and security from states.
4. Exclusivity: The winning airline gets the route alone for three years.

Key Facts for Prelims

5. Only 9% Use Public Transport to Go to Work: National Household Travel Survey

Syllabus: GS1 – Urbanisation; GS3 – Infrastructure, Environment

Why in news: The National Statistics Office (MoSPI) released the factsheet of India’s first-ever National Household Travel Survey (NHTS), conducted July 2025–June 2026, on 5 October 2026. A trip is counted only if it covers more than 1 km. The data shows personal two-wheelers dominate work travel, while buses, trains and metro together carry only around 9% of workers – the figure The Indian Express highlighted.

What the survey found

Why low public transport use is a problem

• Congestion and pollution: Two-wheelers and cars drive urban PM2.5 and transport-sector CO2 emissions, working against India’s net-zero 2070 goal.
• Bus shortage: India has far fewer buses per lakh people than the benchmark of about 60 suggested by MoHUA; most cities lack organised city bus services.
• Gender gap: Women travel shorter distances and spend less – unsafe or unaffordable transport limits their work participation.
• Last-mile gaps: Metros underperform ridership forecasts without feeder buses, walkable streets and integrated ticketing.

Government responses

• PM e-Bus Sewa (2023): 10,000 electric buses for cities under PPP.
• PM e-DRIVE (2024): Subsidy for e-buses, e-two-wheelers and charging.
• National Urban Transport Policy, 2006 (revised 2014) and Metro Rail Policy, 2017 – “move people, not vehicles”.
• National Common Mobility Card (One Nation One Card) for seamless fares.

Key Facts for Prelims

6. Yemeni Government Forces Drive Out Houthis from Bab el-Mandeb

Syllabus: GS2 – International Relations (West Asia); Prelims – Map

Why in news: On 5 October 2026, Saudi-backed forces of Yemen’s internationally recognised government said they had retaken Dhubab district, the coast around the Bab el-Mandeb Strait and the port city of Mocha (Mokha). The Houthis had seized these areas in an offensive launched on 3 September 2026. The Saudi-led coalition said 100 fighter jets were supporting the push, and the government also announced an offensive towards Sanaa, held by the Houthis since 2014. The Houthis denied losing Mocha.

Who is fighting whom

Government units in the offensive include the Giants Brigades and the Nation’s Shield (Homeland Shield) Forces.

Why it matters for India

• Trade route: Bab el-Mandeb links the Red Sea to the Gulf of Aden and is the southern gateway to the Suez Canal. A large share of India’s trade with Europe, North Africa and the US East Coast passes through it.
• Costs: Houthi attacks on shipping since October 2023 forced ships around the Cape of Good Hope, raising freight and insurance costs for Indian exporters.
• Energy security: Oil and LNG flows from the Gulf to Europe and back rely on the strait.
• Diaspora and navy: India runs Operation Sankalp for maritime security in the region and evacuated citizens from Yemen in Operation Raahat (2015).

Key Facts for Prelims (Map)

7. Centre Clears Elevation of Three High Court Chief Justices as Supreme Court Judges

Syllabus: GS2 – Judiciary, appointments

Why in news: On 5 October 2026, the Centre notified the appointment of three High Court Chief Justices to the Supreme Court, a week after the five-member Collegium headed by CJI Surya Kant recommended them on 28 September 2026. They take oath on 6 October 2026.

Significance: The number of women judges in the Supreme Court rises from two to three. Earlier in 2026 the Centre raised the sanctioned strength to 37 judges besides the CJI, so the new posts help cut pendency.

How a Supreme Court judge is appointed (Collegium system)

1. Recommendation: The CJI and four senior-most judges (the Collegium) select names, considering seniority, merit and representation of High Courts.
2. Background check: The Law Ministry gathers inputs, including from the Intelligence Bureau.
3. Centre’s response: The government may return a name once for reconsideration; if the Collegium reiterates it, the name is binding.
4. Appointment: The President issues the warrant under Article 124(2); the CJI administers the oath.

Debate on the Collegium

• For: Protects judicial independence, part of the basic structure.
• Against: Opaque, no written criteria, limited diversity; the government cannot speed or block it openly but can delay files.
• Reform: The NJAC (99th Amendment, 2014) was struck down in 2015; the Memorandum of Procedure (MoP) remains unsettled.

Key Facts for Prelims

8. House Privileges vs Free Speech: The Question Before the Supreme Court

Syllabus: GS2 – Parliament and State Legislatures, Fundamental Rights

Why in news: A seven-judge Constitution Bench was set to hear, from 6 October 2026, whether legislative privileges under Article 194 can override the right to free speech under Article 19(1)(a). On 5 October, after Tamil Nadu said the 2003 Assembly resolution at the heart of the case had been withdrawn, CJI Surya Kant said the court would not engage in an academic exercise. The larger question may therefore wait for a live dispute.

Background of the case

• N. Ravi v. Speaker, Tamil Nadu Legislative Assembly (2003): The Assembly held that editorials and reports in The Hindu breached its privilege, sentenced journalists to jail and ordered arrests. The Supreme Court stayed the arrests in November 2003.
• The matter was referred to a larger Bench, and in October 2023 a seven-judge Bench agreed to hear it.
• Comedian Kunal Kamra, facing privilege proceedings in the Maharashtra Legislature, sought to intervene, arguing that privilege cannot be used to silence citizens.

The core questions

1. Can privileges under Article 194(3) be used against non-members – journalists, comedians, citizens – for speech outside the House?
2. Do uncodified privileges, inherited from the British House of Commons, sit above Articles 19(1)(a) and 21?
3. Can a House act as judge in its own cause, and how far can courts review such action?

Key Facts for Prelims

9. Why Is Buxa Bringing Tigers Back?

Syllabus: GS3 – Environment, Biodiversity conservation

Why in news: On 5 October 2026, Union Environment Minister Bhupender Yadav announced the release of tigress T138, translocated from Bihar’s Valmiki Tiger Reserve, into the wild at Buxa Tiger Reserve – West Bengal’s first tiger reintroduction. The plan is to bring about seven tigers to Buxa over two years.

Why Buxa lost its tigers

• The 2018 All India Tiger Estimation found no resident tigers in Buxa; a few had been recorded in 2012.
• Habitat fragmentation: The reserve is ringed by settlements, revenue villages and tea gardens, and crossed by roads and a railway line.
• Poor prey base: Grasslands shrank and herbivores such as chital declined, so tigers could not sustain territories.
• Past pressures included timber extraction, cattle grazing and poaching.

Why bring them back

• Apex predator: Tigers regulate herbivore numbers and keep the forest ecosystem healthy.
• Landscape link: Buxa connects with Phibsoo Wildlife Sanctuary (Bhutan) to the north and Manas (Assam) to the east, so a resident population can strengthen a trans-boundary tiger corridor.
• Source choice: Valmiki has similar hill-and-plain terrain and prey, making adaptation easier.

Conditions for success

1. Prey first: Chital and sambar augmentation and grassland restoration before more releases.
2. Breeding: Success means tigers establishing territories and raising cubs, not just the number released.
3. Conflict control: With low wild prey, tigers may kill goats and cattle; quick compensation and community buy-in are vital.
4. Genetic diversity: Natural movement through corridors must be kept open.

India’s past reintroductions show both outcomes – Sariska (2008) and Panna (2009) recovered after local extinction, while Satkosia (Odisha, 2018) failed amid local opposition.

Key Facts for Prelims

10. Why Are States Divided over the Mining Amendment?

Syllabus: GS3 – Mineral resources, Economy; GS2 – Fiscal federalism, Centre–State relations

Why in news: The Mines and Minerals (Development and Regulation) Amendment Act, 2026, passed by Lok Sabha on 12 August and Rajya Sabha on 13 August 2026, bars states from levying any tax or cess on mineral rights and mineral-bearing land except on conditions set by the Centre. Mineral-rich states see it as an attack on their taxing powers; the Centre and industry call it overdue rationalisation.

What the amendment does

• New Section 9D: States cannot impose levies based on mineral quantity, value, royalty or any other basis, except as the Centre prescribes.
• Mineral-bearing land is brought under central regulation alongside minerals.
• Past dues: Levies collected before the Act stay with states, but unpaid claims from before the Act cannot be enforced.
• Unchanged: States keep royalty, auction premium, DMF contributions and powers over minor minerals.

The trigger: the 2024 Supreme Court verdict

In Mineral Area Development Authority v. SAIL (July 2024), a nine-judge Bench held 8:1 that royalty is not a tax, and that states can tax mineral rights and mineral-bearing land under Entries 49 and 50 of the State List, subject to limits Parliament sets by law. The Court also allowed states to recover past dues from 2005. The 2026 amendment uses that “limits by Parliament” power under Entry 50.

Why states are divided: Producer states (Jharkhand, Odisha, Chhattisgarh, Karnataka) lose fiscal space, while consumer and industrial states gain from cheaper coal, steel and power. Opposition-ruled states may challenge the Act in court.

Key Facts for Prelims