#1SCIENCE & SPACE
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RK-251 Smart Cancer Drug

ЁЯФ╣ Why in News & Recent Development

The Ministry of Science and Technology recently announced the development of RK-251, a pioneering smart cancer drug engineered to serve as a targeted, non-toxic alternative to traditional chemotherapy, reducing systemic side effects.

ЁЯФ╣ Mechanism of Action and Targeted Delivery

Unlike conventional chemotherapy, which damages both healthy and malignant cells, RK-251 remains inactive in normal tissues. It is triggered selectively inside cancer cells characterized by elevated levels of reactive oxygen species (ROS). This ROS-rich microenvironment activates the drug, releasing the potent anti-cancer compound NBDHEX, which blocks critical survival proteins inside the tumor cells.

ЁЯФ╣ Diagnostic Potential and Therapeutic Efficacy

The drug is designed with built-in fluorescence response capabilities. When activated in an ROS-dense environment, it emits a distinct fluorescent signal, enabling clinicians to visually verify drug delivery and localization. Pre-clinical evaluations demonstrate high efficacy against aggressive triple-negative breast cancer cells with negligible impact on healthy cell lines.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Nodal Ministry**: Ministry of Science and Technology, Government of India. - **Developing Institutions**: Co-developed by the **Institute of Advanced Study in Science and Technology (IASST)** and the **Indian Institute of Technology (IIT) Guwahati**. - **Target Disease**: Triple-negative breast cancer (one of the most aggressive and hard-to-treat cancer types). - **Key Compound**: **NBDHEX** (an inhibitor of glutathione S-transferase designed to combat drug resistance in cancer cells). - **PYQ Trend**: State PCS exams frequently test new drug discoveries, nanotechnology in medicine, and major institutional achievements of IITs.
#2GEOGRAPHY & WATER RESOURCES
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Parichha Dam (World Heritage Irrigation Structure)

ЁЯФ╣ Why in News & Recent Development

The International Commission on Irrigation and Drainage (ICID) has officially recognized the historic Parichha Dam in Jhansi, Uttar Pradesh, as a World Heritage Irrigation Structure (WHIS), highlighting its 140-year contribution to water security in Bundelkhand.

ЁЯФ╣ Historical Context and Engineering

The canal system for the arid Bundelkhand region was first proposed by Captain Strachey in 1855. Following extensive surveys, construction on the Parichha Dam commenced in 1881, and the structure became fully operational in 1886. It serves as the lifeline of the Betwa Canal System, providing vital agricultural irrigation across drought-prone areas of both Uttar Pradesh and Madhya Pradesh.

ЁЯФ╣ ICID and World Heritage Irrigation Structure (WHIS) Criteria

The ICID, established in 1950, honors historic irrigation systems under the WHIS program to promote preservation. To qualify, a structure must be more than 100 years old and retain historical, engineering, or structural significance (such as operational dams, canal systems, or ancient waterwheels). In 2022, another historic Bundelkhand structure, the Sukwa-Dukwan Weir in Jhansi, was also inducted into this prestigious list.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **State & District**: Uttar Pradesh, Jhansi District. - **River**: **Betwa River** (a major tributary of the Yamuna River, rising in the Vindhya Range). - **Historic Milestones**: Proposed in 1855, constructed 1881-1886. - **Associated Network**: Part of the **Betwa Canal System** benefiting UP and MP. - **Sister Heritage Site**: **Sukwa-Dukwan Weir** (Jhansi, UP) received WHIS status in 2022. - **Nodal International Body**: International Commission on Irrigation and Drainage (ICID), headquartered in New Delhi. - **PYQ Trend**: UP PCS highly prioritizes Bundelkhand's geography, the Betwa River system (including the Ken-Betwa link project), and local engineering heritage.
#3SOCIAL JUSTICE & GOVERNANCE
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Pradhan Mantri Janjatiya Vikas Mission (PMJVM)

ЁЯФ╣ Why in News & Recent Development

The Union Government is stepping up efforts to formalize and scale the tribal forest-based economy through structured infrastructure and market access under the Pradhan Mantri Janjatiya Vikas Mission (PMJVM).

ЁЯФ╣ Core Philosophy and Capacity Building

Launched during the financial year 2021-22, PMJVM aims to move tribal gatherers up the value chain from merely selling raw Minor Forest Produce (MFP) to processing, branding, and marketing. The mission integrates traditional tribal knowledge with modern processing technology, scientific harvesting, and reliable financial linkages.

ЁЯФ╣ The Van Dhan Vikas Kendra (VDVK) Model

The program is anchored by the Van Dhan Vikas Kendra (VDVK) model, which leverages Self-Help Groups (SHGs). Typically, a single VDVK comprises a cluster of 15 tribal SHGs, totaling roughly 300 members. To ensure targeted impact, at least 60 percent of the members must belong to Scheduled Tribe (ST) communities. This structural alignment builds on the foundation laid by the Van Dhan Yojana in 2018.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Nodal Ministry**: Ministry of Tribal Affairs, Government of India. - **Launch Year**: 2021-22 (building on the 2018 Van Dhan Yojana). - **Primary Target**: Scheduled Tribes (STs) and Particularly Vulnerable Tribal Groups (PVTGs). - **Key Agency**: Tribal Cooperative Marketing Development Federation of India (TRIFED). - **Constitutional Connection**: **Fifth and Sixth Schedules** of the Constitution; Article 46 (promotion of educational and economic interests of Scheduled Castes, Scheduled Tribes, and other weaker sections). - **PYQ Trend**: Tribal welfare, forest rights, and minor forest produce-related government schemes are frequently featured in GS Paper II and Paper III.
#4DEFENCE & MISSILE TECH
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Divyastra Mk3 Jet-Powered Loitering Munition

ЁЯФ╣ Why in News & Recent Development

A defense startup based in Lucknow, Uttar Pradesh, successfully conducted the maiden flight test of the Divyastra Mk3, making it IndiaтАЩs first indigenously designed, developed, and manufactured jet-powered loitering munition equipped with an indigenous powerplant.

ЁЯФ╣ Design and Operational Capabilities

Divyastra Mk3 is an indigenous loitering munition, colloquially known as a kamikaze drone or suicide drone. It is engineered to neutralize high-value enemy assets, infrastructure, and defensive positions by striking them directly with an integrated explosive warhead. It boasts an estimated operational range of 300 to 400 km, cruising speeds of 250 to 300 kmph, and a payload capacity of up to 15 to 20 kg.

ЁЯФ╣ The Edge of Jet Propulsion

While conventional suicide drones utilize propeller-driven piston engines that prioritize low-cost endurance, Divyastra Mk3 uses a compact indigenous jet engine developed in New Delhi. This propulsion architecture grants the platform high-speed maneuverability, significantly reducing the reaction and interception window for hostile air defense networks.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Developing Startup**: **Kawa UAV Pvt. Ltd. (HoverIt)**, based in Lucknow, Uttar Pradesh. - **Powerplant Developer**: **DG Propulsion**, New Delhi. - **UP Connection**: Developed within the **Uttar Pradesh Defence Industrial Corridor** ecosystem, highlighting Lucknow's emergence as a defense manufacturing hub. - **UAV Classification**: Jet-powered Kamikaze / Loitering Munition with AI-enabled target engagement. - **PYQ Trend**: Indigenization of technology (GS Paper III) and state-specific industrial developments are key areas of focus for UP PCS Mains and Prelims.
#5GEOGRAPHY & INTERNATIONAL PLACES
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Christmas Island (External Territory of Australia)

ЁЯФ╣ Why in News & Recent Development

A commercial aerospace firm successfully towed its flagship Starship spacecraft to the waters off Christmas Island after the vehicle spent nearly 24 days floating in the Indian Ocean, spotlighting the island's remote maritime location.

ЁЯФ╣ Geographical and Geological Profile

Christmas Island is a non-self-governing territory of Australia situated in the northeastern Indian Ocean, roughly 360 km south of Java, Indonesia. Geologically, the island is the subaerial summit of a massive underwater volcanic mountain, with its highest point, Murray Hill, rising to 361 meters. Its coast is marked by steep, rugged cliffs, with the primary settlement located at Flying Fish Cove.

ЁЯФ╣ Ecological Marvels and Conservation

Approximately 63% of the island is preserved as a national park dominated by tropical rainforest. The island is world-famous for the spectacular annual migration of the endemic Christmas Island red crab (Gecarcoidea natalis). The surrounding pristine marine reefs are highly biodiverse, earning the region the nickname "Australia's Galapagos Islands" alongside the neighboring Cocos (Keeling) Islands.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Sovereignty**: External Territory of **Australia** (since 1958; historically part of the British Straits Settlements administered from Singapore). - **Capital & Chief Port**: **Flying Fish Cove**. - **Key Species**: **Christmas Island Red Crab** (*Gecarcoidea natalis*), protected under strict environmental mandates. - **Major Resource**: Historically driven by **phosphate mining** (discovered in 1887), now transitioning to tourism and scientific research. - **PYQ Trend**: Island geography, maritime boundaries, and ecological hotspots in the Indian Ocean are recurring themes in geography mapping sections.
#6SCIENCE & SPACE
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Sea Urchin-Inspired Bio-Implants

ЁЯФ╣ Why in News & Recent Development

Researchers at the Indian Institute of Technology (IIT) Mandi have engineered a novel biomimetic surface coating inspired by the physical structure of sea urchins for 3D-printed bone implants, aiming to mechanically destroy bacteria and promote rapid bone integration.

ЁЯФ╣ Biomimicry and Antimicrobial Mechanism

By studying the spiky defensive architecture of sea urchins, scientists created a micro-structured surface pattern on titanium and polymer-based bone implants. This biomimetic coating physically ruptures bacterial cell membranes on contact without relying on chemical antibiotics, addressing the critical challenge of post-surgical implant infections and antibiotic resistance.

ЁЯФ╣ Biology of Sea Urchins

Sea urchins are spiny marine invertebrates belonging to the phylum Echinodermata, making them close relatives of starfish and sea cucumbers. They possess a globular, hard skeleton called a **test**, made of interlocking plates, covered in mobile, venomous or non-venomous spines. They feed on marine algae using a highly complex, five-jawed scraping apparatus known as Aristotle's lantern.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Developing Institute**: Indian Institute of Technology (IIT) Mandi. - **Biological Phylum**: **Echinodermata** (spiny-skinned, radially symmetrical marine organisms). - **Key Anatomical Term**: **Aristotle's lantern** (the complex chewing organ of sea urchins). - **Primary Application**: Antimicrobial coatings for orthopedic 3D-printed bone implants. - **PYQ Trend**: Biomimicry, bone tissue engineering, and general invertebrate zoology classification frequently appear in general science papers.
#7SCIENCE & SPACE
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AIKosh Platform under IndiaAI Mission

ЁЯФ╣ Why in News & Recent Development

A high-level national workshop on the AIKosh platform was recently hosted at the India Habitat Centre in New Delhi to operationalize shared data repositories and build a robust domestic artificial intelligence development ecosystem.

ЁЯФ╣ Role and Capabilities of AIKosh

AIKosh (also known as AI Kosha) serves as a specialized national repository for high-quality datasets, pre-trained AI models, shared software toolkits, and educational resources. It incorporates integrated development environments and secure AI sandbox capabilities, allowing researchers, startups, and public institutions to build, test, and safely deploy indigenous AI models.

ЁЯФ╣ The IndiaAI Mission Framework

Administered by a dedicated business division under the government, the IndiaAI Mission is structured around seven pillars: Common Compute Facilities, **AI Kosha**, the upcoming **AI Safety Institute of India**, the IndiaAI Innovation Centre, Application Development, Future Skills Initiative, and Startup Financing.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Nodal Ministry**: Ministry of Electronics and Information Technology (MeitY). - **Implementing Division**: 'IndiaAI', an independent business division under the Digital India Corporation. - **Core Initiative**: Part of the comprehensive **IndiaAI Mission**. - **Key Function**: Providing a secure, non-discriminatory, open-access repository of datasets and developer sandboxes for AI modeling. - **PYQ Trend**: National technology frameworks, digital public infrastructure, and AI regulation policies are highly targeted areas in GS Paper III.
#8GEOGRAPHY & GEOLOGY
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Singhbhum Craton (Oldest Geological Block)

ЁЯФ╣ Why in News & Recent Development

Geological researchers have identified a 3.5-billion-year-old layered greenstone rock formation within the Singhbhum Craton in eastern India, yielding critical chemical signatures that may represent some of the earliest evidence of life on Earth.

ЁЯФ╣ Understanding a Geological Craton

A craton is an old, stable part of the continental lithosphere that has survived merged and broken continental cycles over billions of years. Located across Jharkhand and Odisha, the Singhbhum Craton is composed of ancient crystalline basement rocks surrounded by younger mobile belts. Its oldest components are volcanic-sedimentary assemblages termed greenstone successions, representing ancient oceanic crust and island arcs.

ЁЯФ╣ Global Analogues and Early Earth Tectonics

The geology of the Singhbhum Craton closely mirrors the well-documented greenstone belts of South Africa's Barberton region and Western Australia's Pilbara Craton. All three cratonic shields experienced extensive submarine mafic volcanic eruptions (rich in magnesium oxide) between 3.5 and 3.3 billion years ago, preserved today as distinct pillowed lava formations and komatiites.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Geographical Extent**: Spans across the states of **Jharkhand** and **Odisha** (bounded by the Chhota Nagpur Plateau and the Eastern Ghats). - **Rock Age**: Exceeds **3.5 billion years** (dating back to the Archaean Eon). - **Key Mineral Formations**: Prominent deposits of iron ore (hematite), copper, and chromite. - **Geological Analogues**: **Pilbara Craton** (Australia) and **Barberton Greenstone Belt** (South Africa). - **PYQ Trend**: Indian rock systems (Archaean, Dharwar, Cudappah, Vindhyan) are essential topics under physical geography for civil services exams.
#9ENVIRONMENT & EARTH SCIENCES
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National Centre for Polar and Ocean Research (NCPOR)

ЁЯФ╣ Why in News & Recent Development

The Ministry of Earth Sciences organized the 8th Meeting of the **BRICS Working Group on Ocean Polar Science and Technology (OPST)** in Goa, hosted directly by the National Centre for Polar and Ocean Research (NCPOR).

ЁЯФ╣ Institutional Mandate and Core Functions

Established in May 1998 in Goa, NCPOR (formerly known as the National Centre for Antarctic and Ocean Research) is an autonomous research institution. It acts as the nodal agency for coordinating and executing India's scientific expeditions to the **Arctic**, **Antarctica**, **Southern Ocean**, and the high-altitude **Himalayas**.

ЁЯФ╣ Strategic and Scientific Infrastructure

NCPOR manages India's permanent polar research infrastructure, including the operational Antarctic research bases Maitri and Bharati, the Arctic base Himadri at Ny-├Еlesund, Svalbard, and the Himalayan research station Himansh in Spiti, Himachal Pradesh. The agency is also a key implementer of India's **Deep Ocean Mission**.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Location**: Headquartered in Headland Sada, Vasco da Gama, **Goa**. - **Nodal Ministry**: Ministry of Earth Sciences, Government of India. - **Antarctic Stations**: **Maitri** (established 1989), **Bharati** (established 2012). *Dakshin Gangotri* (1983) is decommissioned and now serves as a supply base. - **Arctic Base**: **Himadri** (established 2008). - **Himalayan Base**: **Himansh** (established 2016). - **PYQ Trend**: Location of polar research bases, IndiaтАЩs scientific diplomacy, and ocean floor exploration programs are tested across both Prelims and Mains.
#10GEOGRAPHY & INTERNATIONAL PLACES
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Zambia (Southern-Central African Landlocked Nation)

ЁЯФ╣ Why in News & Recent Development

The Prime Minister of India recently extended formal congratulations to Hakainde Hichilema on his re-election as the President of Zambia, highlighting India's commitment to diplomatic and trade relations with Southern Africa.

ЁЯФ╣ Geographical Location and Land Boundaries

Zambia is a landlocked nation located in Southern-Central Africa. It is bounded by eight countries: the Democratic Republic of the Congo (north), Tanzania (northeast), Malawi (east), Mozambique (southeast), Zimbabwe and Botswana (south), Namibia (southwest), and Angola (west).

ЁЯФ╣ Hydrological and Topographical Highlights

The nation is dominated by high-elevation plateaus, with its highest elevation located in the Mafinga Mountains. Its primary river is the Zambezi River, which drains into the Indian Ocean and creates the world-famous **Victoria Falls** on the Zambia-Zimbabwe border. Other significant interior rivers include the Kafue and the Luangwa, while major lakes include **Lake Tanganyika** and **Lake Kariba**.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Capital City**: **Lusaka**. - **Major Waterways**: **Zambezi River**, **Victoria Falls** (known locally as *Mosi-oa-Tunya*), and Lake Kariba (one of the world's largest man-made reservoirs). - **Mineral Resources**: Exceptionally rich in **copper** (centered around the 'Copperbelt' province), cobalt, emeralds, and uranium. - **PYQ Trend**: African mapping exercises, particularly landlocked countries, trans-boundary river systems, and major mineral belts, are highly recurring areas of focus.
#11POLITY, CONSTITUTION & SOCIAL JUSTICE
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Government Stance on SC/ST Creamy Layer Exclusion

ЁЯФ╣ Why in News & Recent Development

The Central Government has formally opposed the extension of the creamy layer exclusion principle to Scheduled Castes (SCs) and Scheduled Tribes (STs) in a submission to the Supreme Court, following observations made by a seven-judge Constitution Bench in the 2024 State of Punjab v. Davinder Singh case.

ЁЯФ╣ Origin and Evolution of the Creamy Layer Concept

The concept of the 'creamy layer' was established in the landmark Indra Sawhney v. Union of India (1992) ruling, which mandated the exclusion of socially and economically advanced individuals from the **27% reservation for Other Backward Classes (OBCs)**. However, this rule was not historically applied to SCs and STs, whose reservation eligibility is constitutionally recognized as stemming from deep-seated historical untouchability, structural caste-based discrimination, and geographic isolation.

ЁЯФ╣ Constitutional Arguments and Separation of Powers

The executive contends that SC/ST backwardness is structural and cannot be resolved through mere economic determinism. Under Articles 341(2) and 342(2), any alteration to the Presidential lists of SCs and STs can *only be enacted by Parliament via law*. The government argues that judicially imposing a creamy layer would bypass parliamentary supremacy and violate the **separation of powers**, as established in the 2001 *State of Maharashtra v. Milind* ruling.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Key Constitutional Articles**: **Article 17** (Abolition of Untouchability), **Article 16(4A)** (Reservations in promotions), **Article 341** (Scheduled Castes list), **Article 342** (Scheduled Tribes list), and **Article 340** (OBC Commission). - **Landmark Case Laws**: **Indra Sawhney (1992)** (Creamy layer established for OBCs), **Jarnail Singh (2018)** (Creamy layer application discussed), and **Davinder Singh (2024)** (Permitted sub-classification of SCs/STs to prevent 'elite capture'). - **Executive Demand**: Use of a contemporary **Socio-Economic Caste Census (SECC)** before making any far-reaching policy changes. - **PYQ Trend**: Reservation-related constitutional amendments, judicial reviews, and the rights of marginalized communities are core areas of testing in GS Paper II.
#12INDIAN ECONOMY & AGRICULTURE
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IndiaтАЩs Makhana Sector and Mithila Makhana GI Tag

ЁЯФ╣ Why in News & Recent Development

The Central Government has highlighted the rapid commercialization and growth of IndiaтАЩs makhana sector, supported by the launch of the National Makhana Board in Bihar and the approval of a Central Sector Scheme for the Development of Makhana with an outlay of тВ╣476.03 crore.

ЁЯФ╣ Global Dominance and Production Hubs

India is the world's largest producer of makhana (scientifically known as Euryale ferox or fox nut), an aquatic crop grown in shallow wetlands. The state of Bihar accounts for nearly 80% to 85% of the global supply, concentrated heavily in the **Kosi basin districts of Supaul, Saharsa, and Madhepura**, alongside the traditional **Mithila and Seemanchal** regions.

ЁЯФ╣ GI Tag and Sectoral Modernization

To protect traditional cultivation techniques and product identity, Mithila Makhana was granted a **Geographical Indication (GI) tag**. Cultivation is transitioning from labor-intensive pond harvesting to highly productive **field-system farming**, driven by high-yielding seed varieties such as Swarna Vaidehi and Sabour Makhana-1.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Geographical Indication (GI) Status**: **Mithila Makhana** (Bihar). - **Primary State**: **Bihar** (produces around 80-85% of global makhana). - **Improved Varieties**: **Swarna Vaidehi** and **Sabour Makhana-1**. - **Nodal Agency**: **National Makhana Board** (established September 15, 2025) and the National Research Centre for Makhana (NRCM), Darbhanga, Bihar. - **Nutritional Profile**: Low-glycemic, gluten-free, rich in protein, calcium, magnesium, and potassium. - **PYQ Trend**: GI tags, cropping patterns, agricultural schemes, and value addition in food processing are tested in both Prelims and Mains.
#13INDIAN ECONOMY
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Foreign Assets of Small Taxpayers Disclosure Scheme (FAST-DS)

ЁЯФ╣ Why in News & Recent Development

The Central Board of Direct Taxes (CBDT) has formally notified the Foreign Assets of Small TaxpayersтАУDisclosure Scheme (FAST-DS) 2026, a one-time voluntary disclosure mechanism enacted under the Finance Act, 2026.

ЁЯФ╣ Classification and Eligibility Criteria

The scheme allows residents (including those who were resident in the year of asset acquisition) to voluntarily disclose undeclared offshore assets and income without fear of prosecution. It divides disclosures into two classes: Category I (undisclosed foreign assets/income under тВ╣1 crore, taxed at an effective rate of **60%**) and Category II (undeclared foreign assets under тВ╣5 crore acquired via legitimately taxed income or during non-resident status, subject to a flat fee of **тВ╣1 lakh**).

ЁЯФ╣ Valuation Guidelines and Exclusions

Assets are valued based on their **Fair Market Value (FMV)** as of March 31, 2026. Successful declarants receive total immunity from prosecution under the **Black Money Act, 2015**. However, the scheme strictly excludes assets that constitute proceeds of crime under the **Prevention of Money-laundering Act, 2002 (PMLA)**.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Nodal Authority**: Central Board of Direct Taxes (CBDT), Ministry of Finance. - **Governing Legislation**: Finance Act, 2026; **Black Money (Undisclosed Foreign Income and Assets) and Imposition of Tax Act, 2015**. - **Valuation Date**: March 31, 2026. - **Category Limits**: Category I (up to тВ╣1 crore); Category II (up to тВ╣5 crore). - **PYQ Trend**: Tax reforms, schemes tackling black money, and direct taxation policies are critical components of the GS Paper III economics syllabus.
#14INTERNATIONAL RELATIONS & GEOPOLITICS
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ChinaтАЩs Antelope Reef Base (Paracels Archipelago)

ЁЯФ╣ Why in News & Recent Development

Recent satellite imagery has confirmed that China has successfully finished phase-one land reclamation and deep-water harbor construction at Antelope Reef in the disputed Paracels archipelago, stepping up its military presence in the South China Sea.

ЁЯФ╣ Strategic 'Bastion' Undersea Defense Strategy

Geopolitical analysts evaluate that the newly reclaimed 6-km man-made structuresтАФfeaturing a 680-meter wharf, a deep-water harbor, a helicopter pad, and a potential runwayтАФare designed to secure a protected undersea **bastion**. This bastion aims to shield China's nuclear-armed **ballistic missile submarines** from detection by foreign maritime forces.

ЁЯФ╣ The Territorial Dispute and Maritime Impact on India

While Vietnam claims historical sovereignty over the Paracels, China has exercised *de facto* control since the 1974 Battle of the Paracel Islands. China's expansive **Nine-Dash Line** maritime claim was invalidated by the Permanent Court of Arbitration in 2016 under **UNCLOS**. This militarization directly threatens India, as more than 55% of IndiaтАЩs maritime trade passes through the **Malacca Strait** and the South China Sea.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Geographic Feature**: **Antelope Reef** within the **Paracel Islands** (South China Sea). - **Contesting Parties**: China, Vietnam, the Philippines, Malaysia, Brunei, and Taiwan. - **Key Legal Framework**: United Nations Convention on the Law of the Sea (**UNCLOS**, 1982) and the **2016 South China Sea Arbitral Award**. - **India's Maritime Chokepoint**: **Malacca Strait**, critical for India's trade and its 'Act East' policy. - **PYQ Trend**: Mapping of disputed maritime islands (Spratlys, Paracels, Senkaku) and ocean diplomacy are highly examined in international relations.
#15ENVIRONMENT & ECOLOGY
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Satkosia Tiger Reserve (STR)

ЁЯФ╣ Why in News & Recent Development

The Odisha government has established a high-level inquiry committee to investigate the relocation of local forest villages from the Satkosia Tiger Reserve (STR), responding to allegations of forced displacement.

ЁЯФ╣ Geographical Setting and Ecological Confluence

Notified as a tiger reserve in 2007 by combining the **Satkosia Gorge Sanctuary** (1976) and the **Baisipali Sanctuary** (1981), Satkosia is located in central Odisha. It sits at the unique biogeographical confluence of the **Deccan Peninsula** and the **Eastern Ghats**. The reserve is defined by a majestic 22.5-km-long gorge carved out by the **Mahanadi River**.

ЁЯФ╣ Wildlife Diversity and Conservation Challenges

The reserve is part of the larger **Mahanadi Elephant Reserve** and supports elephants, leopards, gaurs, mugger crocodiles, and gharials. However, STR faced a complete collapse of its tiger population (declining to zero in 2022). An ambitious inter-state tiger translocation program initiated in 2018 with tigers from Madhya Pradesh was suspended due to local human-wildlife conflict.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **State & Location**: Odisha (Angul, Cuttack, Nayagarh, and Boudh districts). - **Key Hydrological Feature**: **Mahanadi River Gorge** (22.5 km long). - **Legal Frameworks**: **Wildlife (Protection) Act, 1972** and the **Forest Rights Act (FRA), 2006**. - **Coordinating Authority**: National Tiger Conservation Authority (NTCA). - **Biogeographic Zones**: Transition zone between Deccan Peninsula and Eastern Ghats. - **PYQ Trend**: Wildlife sanctuaries, tiger reintroduction programs, and environmental acts are core pillars of geography and environment questions.
#16SCIENCE & SPACE
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Helicase (Replicative DNA Separator)

ЁЯФ╣ Why in News & Recent Development

Recent research in molecular biology has shed new light on the activation of replicative helicases, providing a highly detailed molecular blueprint of how DNA replication begins inside the cell.

ЁЯФ╣ Biochemical Role and Unwinding Mechanism

Helicase is a vital enzyme responsible for unwinding the double-stranded DNA helix during replication. Working as an active molecular motor fueled by **ATP hydrolysis**, replicative helicases bind to replication origins and break the hydrogen bonds between complementary base pairs, separating the strands.

ЁЯФ╣ The Replication Fork and Supercoiling Stress

The unwinding action of the helicase creates a Y-shaped replication fork, providing single-stranded templates for DNA polymerase. However, this process creates severe torsional strain and supercoiling ahead of the fork. Enzymes called topoisomerases work alongside the helicase to relieve this physical tension, preventing DNA breaks.

ЁЯФ╣ UP PCS / STATE PCS HIGH-YIELD VALUE ADDITION

- **Biological Classification**: Replicative Enzyme (Hydrolase/Motor Protein). - **Active Complex**: **CMG Helicase** (formed from inactive MCM2тАУ7 double hexamers). - **Energy Source**: **ATP Hydrolysis** (nucleotide-driven thermodynamic work). - **Associated Enzyme**: **Topoisomerases** (prevent structural damage and supercoiling during replication). - **PYQ Trend**: Fundamental cell biology, DNA replication mechanisms, and enzyme classifications are frequently tested in general science sections.