30 April 2026

1. Noyyal River

Ø News:  Farmers dependent on the Noyyal River are intensifying efforts to secure a firm commitment from the next government for its restoration and pollution control.

Ø  River System and Location: The Noyyal River is a tributary of the Kaveri River and flows entirely within the state of Tamil Nadu.

Ø Course of the River:

o The river originates from several small streams in the Vellingiri Hills.

o It flows through the districts of Coimbatore, Tirupur, and Erode.

o It ultimately joins the Kaveri River near Noyyal village in Karur district.

Ø Length and Nature:

o The total length of the river is approximately 158 kilometres.

o It is a seasonal river that experiences high flow mainly during the monsoon season.

Ø Irrigation and Water Management Network:

o The Noyyal basin is supported by an extensive traditional water management system.

o This includes 32 tanks, 14 major canals, 23 anicuts, and 55 check dams.

Ø Historical Significance:

o Many of the anicuts and check dams were constructed during the rule of the Chola Dynasty between the 9th and 12th centuries.

o These structures were developed to enhance irrigation and regulate downstream flooding.

Ø Past Importance:

o Until the early twentieth century, the Noyyal River served as the primary source of drinking water for the surrounding region.

Ø Present Environmental Status: At present, the Noyyal River is considered one of the most polluted rivers in India.

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2. Holocene Epoch

Ø News:     A fossil bed dating to the Holocene Epoch has recently been discovered in Thoothukudi.

Ø  Definition: The Holocene Epoch represents the present phase of geological time.

Ø Origin of the Term:

o The term “Holocene” was introduced by Paul Gervais in 1869.

o It was later formally accepted into geological terminology by the International Geological Congress in 1885.

Ø   Alternate Concept:

o The term “Anthropocene Epoch” is sometimes used informally.

o This reflects the dominant influence of human activities on Earth’s systems.

Ø   Beginning of the Epoch:

o The Holocene began approximately 12,000 to 11,500 years ago.

o It marks the end of the last Ice Age, also known as the Pleistocene Epoch.

o The epoch continues up to the present day.

Ø  Geological and Sea Level Changes:

o Over the relatively short duration of the Holocene, continental movements have been minimal, typically less than one kilometre.

o However, melting of glaciers caused global sea levels to rise by about 35 metres during the early Holocene.

Ø   Climatic Characteristics: The epoch is characterised by a warming trend and relatively stable climate conditions compared to the preceding glacial phase.

Ø Sediment Distribution: Holocene sediments, both marine and continental, cover a larger area of the Earth than those of any other geological epoch.

Ø Human History and Development:

o The Holocene coincides with the late Stone Age and subsequent phases of human history.

o It is unique among interglacial periods because it witnessed the emergence of advanced human civilisations and the development of agriculture.

Ø  Expansion of Human Influence:

o The epoch encompasses the growth and global spread of human populations.

o It includes all recorded human history and the transition towards increasingly urbanised societies.

Ø  Technological Progress:

o The Holocene has seen major technological evolution.

o Human innovation progressed from basic stone tools to highly advanced machinery and complex technologies.

3. Lake Issyk-Kul

Ø News:    Underwater archaeologists have revealed a submerged city in Lake Issyk-Kul, indicating the presence of a civilisation that existed around seven hundred years ago.

Ø  Location and Setting:

o Lake Issyk-Kul is situated in northeastern Kyrgyzstan.

o It is surrounded by the snow-covered Tian Shan mountain range, often referred to as the “Heaven’s Mountains.”

Ø Geological Formation and Basin Type:

o The lake is estimated to have formed about 25 million years ago.

o It is an endorheic lake, meaning it does not drain into any river or ocean system.

Ø Water Characteristics:

o The lake contains blue-coloured water that is brackish in nature.

Ø Altitude and Global Ranking:

o It lies at an elevation of about 1600 metres above sea level.

o It is the world’s second-largest high-altitude lake after Lake Titicaca.

Ø Size and Dimensions:

o The lake stretches approximately 182 kilometres in length.

o Its width reaches up to 61 kilometres.

o It covers a surface area of about 6,280 square kilometres.

Ø Size and Salinity Significance:

o It is the second-largest saline lake in the world after the Caspian Sea.

o It is also the largest lake in Kyrgyzstan.

Ø Depth Characteristics:

o The maximum depth of the lake is around 668 metres.

o Its average depth is approximately 280 metres.

o It ranks as the seventh deepest lake globally.

Ø Climatic and Thermal Features:

o Due to its depth, relatively low salinity, and the presence of warm springs, the lake does not freeze even during winter.

o The name “Issyk-Kul” translates to “hot lake.”

Ø Ecological Diversity:

o The surrounding landscape exhibits a wide range of ecosystems, from subtropical zones to tundra conditions within short distances.

Ø Environmental Status: In 1976, the lake was designated as a wetland of international importance under the Ramsar Convention.

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UPSC GS 2

4. Pradhan Mantri Rashtriya Bal Puraskar

Ø News:    The Government of India has invited nominations for the Pradhan Mantri Rashtriya Bal Puraskar.

Ø Nature of the Award: The Pradhan Mantri Rashtriya Bal Puraskar is a prestigious national award presented annually by the Government of India.

Ø Fields of Recognition: The award honours children for exceptional achievements in areas such as bravery, art and culture, environment, social service, science and technology, and sports.

Ø Administering Authority: The award is organised by the Ministry of Women and Child Development.

Ø  Eligibility:

o The applicant must be an Indian citizen.

o The child must be above 5 years of age and not more than 18 years old.

o The age is calculated as of 31 July of the respective year.

o The act, incident, or achievement for which the nomination is made should have occurred within two years from the last date of application or nomination.

Ø Number of Awards:

o A maximum of 25 awards are given each year.

o The National Selection Committee may allow relaxation in this number if required.

Ø   Award Components:

o Each recipient is awarded a medal.

o They also receive a certificate and a citation booklet.

5. Sahayog Portal

Ø News: The Delhi High Court has directed the Union government to clarify whether X Corp. must participate in the Sahayog Portal in matters related to human trafficking, child trafficking, and national security.

Ø Nature and Purpose: The Sahayog Portal is an online platform introduced in October 2024 to enable the rapid removal of unlawful content from the internet.

Ø   Core Function: The platform allows government agencies to directly issue takedown notices to social media platforms and other online intermediaries.

Ø  Legal Basis:

o It operates under Section 79(3)(b) of the Information Technology Act 2000, which provides it with statutory backing.

o It ensures that intermediaries act promptly while continuing to retain safe harbour protection under the law.

Ø Nodal Authority: The portal is administered by the Ministry of Home Affairs.

Ø  Key Features:

o The platform integrates government agencies, state and union territory nodal officers, and around 65 online intermediaries into a single communication system.

o It facilitates the rapid and documented transmission of takedown notices to intermediaries.

o This enables quicker removal of illegal or harmful online content.

o The platform functions within a defined legal framework under the IT Act, 2000.

o Non-compliance by intermediaries can attract legal consequences.

o The portal is distinct from Section 69A provisions.

o It focuses on the responsibility of intermediaries to disable unlawful content rather than direct government-led blocking of online content.

UPSC GS 3

6. Tapirs

Ø News: World Tapir Day is observed every year on April 27 to raise awareness about tapir conservation.

Ø General Description:

o Tapir are large, plant-eating mammals.

o They are often referred to as “living fossils” because their evolutionary lineage extends back millions of years.

Ø Physical Features:

o Tapirs possess short and flexible snouts, which they use to grasp leaves and fruits.

o They are strong swimmers and spend a significant amount of time in water bodies.

Ø Diet:

o Tapirs are herbivorous animals.

o Approximately fifty percent of their diet consists of fruits.

Ø Distribution: Tapirs are found in forested and jungle regions of South America, Central America, and Southeast Asia.

Ø Species Diversity: There are only four existing species of tapirs, each occupying distinct geographical regions.

Ø Malayan Tapir:

o The Malayan Tapir is the largest among tapir species and is native to Southeast Asia.

o Its black-and-white body pattern helps it camouflage in forest environments.

o Its conservation status is Endangered.

Ø Baird’s Tapir: 

o Baird’s Tapir is the largest land mammal in Central America.

o It inhabits tropical forests and areas close to water bodies.

o Its conservation status is Endangered.

Ø Lowland Tapir:

o The Lowland Tapir is the most widely distributed species in South America.

o It is commonly found in the Amazon Basin and surrounding regions.

o Its conservation status is Vulnerable.

Ø Mountain Tapir:

o The Mountain Tapir is the rarest species.

o It is found in the high-altitude regions of the Andes.

o Its conservation status is Endangered.

Ø Ecological Role: Tapirs play a crucial ecological role as seed dispersers.

7.  Theridion Himalayana

Ø News:    Scientists have identified a new spider species named Theridion himalayana from the western Himalayan region of India.

Ø Classification and Identity:

o Theridion himalayana is a newly described species of “happy-face spider.”

o It belongs to the Theridiidae family.

Ø Discovery Location:

o The species was discovered in the western Himalayas of India.

Ø Morphological Features: 

o The species exhibits polymorphism in both males and females.

o It shows as many as 32 distinct morphs with varying colour patterns.

o These morphs resemble smiling face-like patterns formed by combinations of red, black, and white dots arranged differently.

Ø Reproductive Features:

o The copulatory ducts are elongated, strongly curved, and extend forward.

o They run nearly parallel to each other before bending downward at their ends.

o The fertilisation ducts are comparatively short and slender.

o They are oriented upward and diverge in a V-shaped pattern.

Ø Ecological Role:

o The species feeds on small flies and insects.

o It contributes significantly to natural insect population control within forest ecosystems.

o The spider may also act as a pollinator for certain plant species.