Minds Of Aspirants (Official)

Environment topic -10 Nitrogen Cycle Importance • Nitrogen is an essential element of proteins, nucleic acids and enzymes. • Constitutes about 16% of protein weight. • Though abundant in the atmosphere as N₂, it cannot be used directly by most organisms. ⸻ Major reservoirs (pools) 1. Atmosphere – largest reservoir (N₂ gas) 2. Soil and water – ammonium, nitrites, nitrates 3. Living organisms – organic nitrogen in tissues ⸻ Key processes in the nitrogen cycle 1. Nitrogen fixation (N₂ → NH₃ / NH₄⁺) • Biological fixation: • Free-living bacteria: Azotobacter (aerobic), Clostridium (anaerobic) • Symbiotic bacteria: Rhizobium in legume root nodules • Blue-green algae: Anabaena, Spirulina • Atmospheric fixation: lightning and thunderstorms • Industrial fixation: fertiliser production • Volcanic activity contributes small amounts 2. Assimilation • Plants absorb ammonium (NH₄⁺) or nitrates (NO₃⁻). • Converted into amino acids and proteins. • Passed to animals through food chains. 3. Ammonification • Decomposition of dead plants and animals. • Organic nitrogen → ammonia / ammonium by bacteria and fungi. 4. Nitrification • Two-step aerobic process: • Nitrosomonas: NH₄⁺ → NO₂⁻ (nitrite) • Nitrobacter: NO₂⁻ → NO₃⁻ (nitrate) 5. Denitrification • Under anaerobic conditions. • Bacteria like Pseudomonas convert nitrates/nitrites → N₂ gas. • Nitrogen returns to the atmosphere, completing the cycle.

Environment topic -9 Sulphur Cycle Nature of cycle • Mostly sedimentary cycle with a small gaseous phase. • Links lithosphere, hydrosphere, biosphere and atmosphere. Major reservoirs 1. Sedimentary reservoir (largest) • Rocks and sediments as sulphates (SO₄²⁻), sulphides, and organic sulphur (coal, oil, peat). 2. Atmospheric reservoir (small) • Sulphur dioxide (SO₂) and hydrogen sulphide (H₂S). Key processes 1. Release to environment • Weathering of sulphur-containing rocks. • Volcanic eruptions. • Decomposition of organic matter. • Combustion of fossil fuels. • Marine sources (H₂S from oceans). 2. Atmospheric transformations • H₂S oxidised to SO₂. • SO₂ dissolves in rainwater → weak sulphuric acid (H₂SO₄). • Returns to earth via acid precipitation. 3. Biological uptake • Plants absorb sulphur mainly as sulphate (SO₄²⁻). • Incorporated into sulphur-containing amino acids (cysteine, methionine). • Passed through food chains to animals. 4. Return to soil and sediments • Excretion and decomposition of plants and animals. • Under aerobic conditions: fungi (e.g., Aspergillus, Neurospora). • Under anaerobic conditions: bacteria (e.g., Escherichia, Proteus). • Sulphur settles as sulphides/sulphates in sediments.

PYQ 2015 Gs 4 Present day world's powerful nation (Economically) uses neo liberalism as a weapon to control, subjugate and suppress weaker nations for resources, to occupy territory and other material gain. 1. Eg. Debt trap policy by china China indirectly controlled srilanka through providing loans. 2. Eg. China ban on REE is one such example. 3. Eg. USA attack on venezuela 4. Eg. Israel - Gaza issue where infrastructure were destroyed - Healthocide / Women and children were victims of war (Famine / Hunger) 4. Eg. Exploitation of Africa for resources 5. Eg. China territorial expansion policy towards india

USA - Venezuela conflict UN Charter Gs 2 Gs 4

PYQ 2023 Gs 2

Competition commission of India Gs 3 Gs 4

Why reading newspaper is important for prelims, mains and interview? Source - The hindu + Business line + Indian express + Business standard+ Other papers + pib Read, Books Newspaper PYQ

BATCH-02 I am happy to announce that enrollment is now open for Xinsheng’26 Prelims Complete Guidance Program — Test Batch + Mentoring! Course Highlights Two classes per week: Tuesday & Thursday 40 plus “live” Revision classes and PYQ analysis “Live” CSAT classes included Mode: Online + Offline Recorded classes available for all sessions Course Duration: Till Prelims 2026 Weekly Sunday Offline Test (All offline tests can also be accessed through the MoA website’s app format) Additional Online Chapter-wise Tests for Xinsheng’26 students Direct mentoring until Prelims 2026 And much more… 📞 Enrollment You can directly contact us for joining, or enroll through our website and send the payment slip to our official ID: @moa_official 🌐 Website: https://mindsofaspirants.com/ Test Portal (Prelims Tests): https://prelims.mindsofaspirants.com/ Thank you for your continued support!

Environment topic -8 FOOD CHAIN 1. Meaning A food chain is a linear sequence of organisms through which food, nutrients, and energy pass as one organism eats another. ➡️ It represents transfer of energy from producers to consumers. ⸻ 2. Key Features • Linear pathway of energy flow • Energy moves only in one direction • Each step is called a trophic level • Usually limited to 4–5 trophic levels (due to energy loss) • Begins with producers and ends with top consumers/decomposers ⸻ 3. Trophic Levels 1. Producers – Green plants (autotrophs) 2. Primary consumers – Herbivores 3. Secondary consumers – Carnivores feeding on herbivores 4. Tertiary consumers – Top carnivores 5. Decomposers – Bacteria and fungi (act on all levels) ⸻ 4. Types of Food Chains I. Grazing Food Chain • Starts with green plants • Energy flows from plants → herbivores → carnivores Example: 🌱 Grass → 🦗 Grasshopper → 🐸 Frog → 🐍 Snake → 🦅 Eagle Key point: Most common food chain in grassland and aquatic ecosystems. ⸻ II. Detritus Food Chain • Starts with dead and decaying organic matter (detritus) • Energy flows through detritivores and decomposers Example: 🍂 Detritus → 🪱 Earthworm → 🐀 Mole → 🦅 Predator Key point: • Dominant in forests • A large portion of ecosystem energy flows through this chain ⸻ III. Parasitic Food Chain • Energy flows from large host organisms to smaller parasites • Parasites usually do not kill the host Example: 🦓 Zebra → 🪱 Nematode → 🦠 Bacteria Key point: Energy transfer occurs from host → parasite → hyper-parasite ⸻ 5. Importance of Food Chain • Explains energy flow in ecosystems • Helps understand population balance • Basis for food webs • Indicates ecosystem health

Environment topic -7 National Board for Wildlife (NBWL) 1. Legal Basis • Constituted under Chapter II, Section 5A of the Wildlife (Protection) Act, 1972 • Established by the Government of India • It is a statutory body ⸻ 2. Nature of the Body • Apex body for wildlife conservation in India • Advisory in nature • Advises the Central Government on: • Conservation and development of wildlife and forests • Wildlife-related policies and projects ⸻ 3. Composition of NBWL Chairperson • Prime Minister of India Vice-Chairperson • Minister of Environment, Forest and Climate Change (MoEFCC) ⸻ Members (Total: 47) 1. Non-official Members (15) • Eminent conservationists • Ecologists • Environmentalists • Representatives of NGOs ⸻ 2. Ex-officio & Official Members (29) Includes: • Members of Parliament • Chief of Army Staff • Director General of Forests • Directors of: • Wildlife Institute of India (WII) • Zoological Survey of India (ZSI) • Botanical Survey of India (BSI) • Indian Veterinary Research Institute (IVRI) • Director of Wildlife Preservation • Secretaries of concerned departments • Representatives of States and Union Territories (by rotation) ⸻ 4. Role of NBWL • Acts as the highest policy-making and advisory authority for wildlife conservation • Reviews and approves: • Projects inside National Parks • Wildlife Sanctuaries • Other protected areas 👉 No major diversion of land in protected areas can occur without NBWL approval ⸻ 5. Functions of NBWL Primary Function To promote the conservation and development of wildlife and forests. ⸻ Specific Functions 1. Policy formulation • Advises Central and State Governments on wildlife conservation policies 2. Control of poaching and illegal trade • Suggests measures to curb wildlife crime and trafficking 3. Protected areas • Recommends creation of: • National Parks • Wildlife Sanctuaries • Other protected areas 4. Impact assessment • Assesses impact of developmental projects on: • Wildlife • Habitats 5. Monitoring • Reviews progress of wildlife conservation in India 6. Reporting • Prepares and publishes a status report on wildlife at least once every two years ⸻ 6. Importance of NBWL • Ensures balance between development and conservation • Provides scientific and expert guidance • Acts as a check on arbitrary diversion of forest land

Environment topic -6 Wildlife (Protection) Act, 1972 1. Introduction The Wildlife (Protection) Act, 1972 (WPA) was enacted by the Government of India on 21 August 1972 to provide a comprehensive legal framework for the protection of: • Wild animals • Birds • Plants and to ensure ecological and environmental security of the country. It is an umbrella legislation covering: • Protection of flora and fauna • Regulation of hunting • Control of harvesting • Trade and commerce of wildlife products 👉 The Act applies to the entire territory of India. ⸻ 2. Amendments • 2003 Amendment – Strengthened penalties, introduced Wildlife Crime Control Bureau • 2017 Amendment – Alignment with international conventions (CITES), stricter enforcement ⸻ 3. Objectives of the Wildlife (Protection) Act, 1972 1. Prevent hunting of wild animals and birds 2. Punish violators of wildlife laws 3. Protect endangered species 4. Provide shelter and protection to wild flora and fauna 5. Ban trade and commerce of protected species 6. Preserve biodiversity and maintain ecological balance 👉 In short: Protection + Prohibition + Preservation ⸻ 4. Constitutional Basis of the Act Article 48A (Directive Principles of State Policy) • Directs the State to: • Protect and improve the environment • Safeguard forests and wildlife ⸻ Article 51A(g) (Fundamental Duties) • Imposes duty on citizens to: • Protect forests, lakes, rivers and wildlife • Show compassion for living creatures 👉 Wildlife protection is both a State responsibility and a citizen’s duty.

Environment topic -5 What is an Ecosystem? Meaning An ecosystem is a discrete, dynamic unit of nature where living (biotic) organisms interact with non-living (abiotic) components of the environment for survival, energy flow and material cycling. ⸻ Definition (Arthur Tansley, 1935) An ecosystem is any unit (biosystem) that includes: • Biotic components (plants, animals, microorganisms) and • Abiotic components (physical environment) interacting in such a way that: • Energy flows through the system, and • Materials cycle between living and non-living components. ⸻ Basic Characteristics • Ecosystem is a functional unit, not just a collection of organisms. • It involves interaction, interdependence, and energy dependence. • All ecosystem processes are energy-driven. • Ecosystems vary widely in: • Species composition • Population size • Non-biological components • Time and space ⸻ Major Components of an Ecosystem 1. Producers – Green plants – Capture solar energy and convert it into chemical energy 2. Consumers (Macro-consumers) – Herbivores, carnivores, omnivores – Transfer energy across trophic levels 3. Decomposers (Micro-consumers) – Bacteria and fungi – Break down dead organic matter and return nutrients to the inorganic pool 4. Abiotic nutrient pool – Inorganic nutrients available in soil, water and air ⸻ Energy Flow in Ecosystem • Energy enters the ecosystem from the Sun • Flows from: Sun → Producers → Consumers → Decomposers • Energy is not recycled • Ultimately lost as heat ⸻ Material Cycling • Nutrients cycle between: • Living organisms • Inorganic nutrient pool • Matter is reused, unlike energy ⸻ Structural and Functional Basis of Study The study of ecosystems is based on: • Structure → components (biotic & abiotic) • Function → processes (energy flow, nutrient cycling)

Environment topic -4 Ecosystem Definition An ecosystem is a functional unit of nature where biotic (living) and abiotic (non-living) components interact through energy flow and nutrient cycling. ⸻ I. Ecosystem Features Ecosystem features are broadly divided into: 1. Structural Features (What an ecosystem is made of) A. Abiotic Components (Non-living) 1. Inorganic substances – Carbon, nitrogen, oxygen, carbon dioxide, water – Form the basic raw material for life 2. Organic substances – Proteins, carbohydrates, lipids – Link abiotic components with biotic components 3. Climatic factors – Temperature – Moisture – Light – Topography ➡ These factors determine the type and productivity of the ecosystem. ⸻ B. Biotic Components (Living) 1. Producers – Green plants, algae – Convert solar energy into chemical energy (photosynthesis) 2. Consumers – Primary: Herbivores – Secondary: Carnivores feeding on herbivores – Tertiary: Top carnivores 3. Decomposers – Bacteria and fungi (saprotrophs) – Break down dead organic matter and recycle nutrients ⸻ 2. Functional Features (How an ecosystem works) 1. Energy flow – Energy enters as sunlight – Flows unidirectionally through trophic levels – Ultimately lost as heat (energy does not cycle) 2. Food chains and food webs – Linear and interconnected feeding relationships 3. Biodiversity and interlinkages – Interdependence among organisms ensures ecosystem stability 4. Nutrient cycling (Biogeochemical cycles) – Cycling of carbon, nitrogen, phosphorus, water, etc. – Matter is recycled, unlike energy 5. Ecological succession – Gradual and predictable change in ecosystem structure over time

Environment topic -3 Component of ecosystem - biotic and abiotic Components of Biotic Factors Biotic Components Biotic components are the living organisms present in an ecosystem. They interact continuously with abiotic components such as air, water, soil, sunlight, and temperature to maintain ecosystem functioning. Biotic components are broadly classified into: 1. Producers (Autotrophs) 2. Consumers (Heterotrophs) 3. Decomposers (Saprotrophs / Reducers) ⸻ 1️⃣ Producers / Autotrophs Producers are organisms that manufacture their own food from simple inorganic substances. Characteristics • Contain chlorophyll • Use sunlight for photosynthesis • Form the base of the food chain Types • Photosynthetic producers: Green plants, algae, cyanobacteria • Chemosynthetic producers: Certain bacteria that use chemical energy instead of sunlight Importance • Convert solar energy into chemical energy • Provide food and energy to all other organisms 📌 Examples: Grass, trees, phytoplankton ⸻ 2️⃣ Consumers / Heterotrophs Consumers are organisms that cannot produce their own food and depend on other organisms for energy. Types of Consumers Primary Consumers (Herbivores) • Feed directly on producers 📌 Examples: Deer, goat, grasshopper ⸻ Secondary Consumers (Carnivores) • Feed on herbivores 📌 Examples: Frog, lizard, birds ⸻ Tertiary Consumers • Feed on secondary consumers 📌 Examples: Snake, cat ⸻ Top Carnivores • Occupy the highest trophic level • Not preyed upon by other animals 📌 Examples: Tiger, lion, vulture ⸻ Importance • Transfer energy from producers to higher trophic levels • Regulate population size in ecosystems ⸻ 3️⃣ Decomposers / Saprotrophs / Reducers Decomposers break down dead plants and animals into simpler substances. Characteristics • Mostly microscopic • Heterotrophic in nature • Act on dead organic matter (detritus) Types • Bacteria • Fungi Importance • Recycle nutrients back into the ecosystem • Prevent accumulation of dead organic matter • Maintain nutrient cycling 📌 Example: Fungi and soil bacteria

Environment topic -2 Biomes and Their Types What is a Biome? A biome is a large terrestrial ecological region characterized by: • A distinct climate • Specific vegetation types • Associated animal life • Particular soil conditions Biomes are subdivisions of the biosphere and each biome contains many ecosystems. ⸻ Basis of Biome Classification Biomes are primarily classified on the basis of climate, especially: • Temperature • Precipitation (rain or snow) These climatic factors determine: • Type of vegetation • Animal distribution • Productivity of the biome ⸻ Major Types of Terrestrial Biomes ⸻ 1️⃣ Forest Biome Forests are regions with high tree density and relatively high rainfall. Characteristics • Dense vegetation • High biodiversity • Stratified plant layers (canopy, understory, forest floor) Major types • Tropical rainforests • Temperate deciduous forests • Boreal (taiga) forests 📌 Examples: Amazon rainforest, Western Ghats ⸻ 2️⃣ Grassland Biome Grasslands are dominated by grasses with very few trees. Characteristics • Moderate rainfall • Fertile soils • Supports large herbivores Major types • Tropical grasslands (savannas) • Temperate grasslands (prairies, steppes) 📌 Examples: African savanna, Indian grasslands ⸻ 3️⃣ Desert Biome Deserts are regions with very low rainfall and extreme temperatures. Characteristics • Sparse vegetation • High evaporation • Adapted plants and animals (xerophytes) Major types • Hot deserts • Cold deserts 📌 Examples: Sahara Desert, Thar Desert, Ladakh (cold desert) ⸻ 4️⃣ Tundra Biome Tundra regions are cold, treeless areas with permafrost. Characteristics • Extremely low temperatures • Short growing season • Mosses, lichens, and small shrubs dominate Major types • Arctic tundra • Alpine tundra 📌 Examples: Arctic regions, high Himalayan areas ⸻ 5️⃣ Mediterranean (Shrubland) Biome Found in regions with hot dry summers and mild wet winters. Characteristics • Shrubs and short trees • Fire-adapted vegetation 📌 Examples: Mediterranean region, parts of California ⸻ Aquatic Systems (Not Called Biomes) Aquatic regions are divided into aquatic life zones, not biomes. They are classified based on: • Salinity • Depth • Sunlight availability • Nutrient levels 📌 Examples: freshwater zones, marine zones ⸻ Important Points for Exams • Biomes are climate-based divisions • Each biome contains multiple ecosystems • Climate determines biome boundaries • Temperature and precipitation are the most important factors • Aquatic systems are not termed biomes ⸻

Environment topic -1 Biosphere, Biomes and Distribution of Life Biosphere The biosphere is the largest ecosystem and refers to the part of the Earth where life exists. It includes the lithosphere (land), hydrosphere (water), and atmosphere (air). All ecosystems function within the biosphere, making it the global life-supporting zone. Life in the biosphere is restricted to a very narrow zone. If the Earth were the size of an apple, the biosphere would be only as thick as its skin, showing how thin and fragile this life-supporting layer is. ⸻ Vertical Extent of the Biosphere The biosphere extends: • From the deep ocean floor (about 11,000 m below sea level) • To the tops of high mountains (about 9,000 m above sea level) However, life is most abundant: • About 200 m below sea level • Up to around 6,000 m above sea level Extreme regions such as polar areas, highest mountains, and deep oceans support very little life due to harsh conditions. ⸻ Distribution of Life Living organisms are not uniformly distributed across the biosphere: • Tropical rainforests show the highest biodiversity • Polar regions support very limited life Life depends on nutrients from air, water, and soil, which are continuously recycled within the biosphere. The sun is the ultimate source of energy; without solar energy, the biosphere would collapse. ⸻ Biomes The terrestrial part of the biosphere is divided into large regions called biomes. A biome is: • A vast ecological region • Characterized by climate, vegetation, animal life, and soil type Examples include forests, grasslands, deserts, and tundra. Key points about biomes: • Each biome contains many ecosystems • No two biomes are exactly alike • Climate determines biome boundaries • Temperature and precipitation are the most important controlling factors ⸻ Aquatic Life Zones Aquatic systems are divided into aquatic life zones rather than biomes. These zones differ mainly due to: • Salinity • Dissolved nutrients • Water temperature • Depth and sunlight penetration Although similar in concept to biomes, aquatic zones are classified differently.

BATCH-02 I am happy to announce that enrollment is now open for Xinsheng’26 Prelims Complete Guidance Program — Test Batch + Mentoring! Course Highlights Two classes per week: Tuesday & Thursday 40 plus “live” Revision classes and PYQ analysis “Live” CSAT classes included Mode: Online + Offline Recorded classes available for all sessions Course Duration: Till Prelims 2026 Weekly Sunday Offline Test (All offline tests can also be accessed through the MoA website’s app format) Additional Online Chapter-wise Tests for Xinsheng’26 students Direct mentoring until Prelims 2026 And much more… 📞 Enrollment You can directly contact us for joining, or enroll through our website and send the payment slip to our official ID: @moa_official 🌐 Website: https://mindsofaspirants.com/ Test Portal (Prelims Tests): https://prelims.mindsofaspirants.com/ Thank you for your continued support!

Oil reserves of the world Venezuela Saudi Arabia Iran Iraq UAE

A very good editorial on the Venezuelan crisis in Businessline Anyone interested in geopolitics do check it out Gs2

Venezuela is a member of OPEC Venezuela world’s largest proven crude oil reserve 303 billion barrels of crude 17% of global crude