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Environment and Natural Resources Revision Notes

Comprehensive handwritten-style revision notes for SUPER TET covering the complete syllabus of environment and natural resources. Concepts span ecosystems, food chains, ecological pyramids, adaptation, pollution types, environmental laws, and international conservation organizations. Key environmental acts, national parks, Ramsar sites, and standard quality marks are tabulated with dates for quick review.

Teaching
Environment
English · 8 topics
Checked against the video on 25 Oct 2026

Made by AI from the YouTube video SUPER TET Science | Environment & Natural Resources Complete Notes | NCERT & SCERT Based | Class 23 (opens YouTube in a new tab) by Balaji Study Adda, then checked against it. All credit for the teaching goes to the creator. Tap a topic’s time to confirm a fact in the video.

Environment and Natural Resources Revision Notes

English8 topics · 6 MCQs · 14 flashcardsWatch the video (opens YouTube in a new tab)

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In short

Comprehensive handwritten-style revision notes for SUPER TET covering the complete syllabus of environment and natural resources. Concepts span ecosystems, food chains, ecological pyramids, adaptation, pollution types, environmental laws, and international conservation organizations. Key environmental acts, national parks, Ramsar sites, and standard quality marks are tabulated with dates for quick review.

Environment and its Components

Environment refers to everything that surrounds us and has a direct or indirect effect on our lives.
Must knowThe components of the environment are divided into two main categories: biotic components and abiotic components.
Biotic components comprise all living organisms present in the environment and are categorized into producers, consumers, and decomposers.
Abiotic components are non-living factors providing essential life-supporting conditions, including sunlight, temperature, water, air, soil, minerals, and pH level.
Producers synthesize their own food via photosynthesis, consumers feed on other plants or animals, and decomposers convert dead organic matter into simpler substances.

Ecosystem, Energy Flow, and Food Chains

Must knowAn ecosystem is the structural and functional system of mutual interactions occurring between biotic and abiotic components in a defined area.
The flow of energy originating from the Sun within an ecosystem is strictly unidirectional and transfers from one organism to another through food consumption.
A food chain is a single sequential, step-by-step pathway through which energy and nutrients transfer between organisms.
Primary consumers feed on producers, secondary consumers consume primary consumers, tertiary consumers eat secondary consumers, and top predators occupy the highest consumer level.
Must knowAccording to Lindeman's 10% Law (1942), only approximately 10% of energy is transferred from one trophic level to the next, while the remaining 90% is dissipated as heat.
A food web is a complex, interconnected network formed when multiple food chains interlink within an ecosystem.

Ecological Pyramids, Decomposition, and Adaptation

An ecological pyramid is a graphical diagram representing numbers, biomass, or energy across successive trophic levels of an ecosystem.
Decomposers such as bacteria and fungi break down dead organic remnants into simple inorganic substances, returning essential nutrients to the soil for plant reabsorption.
Adaptation consists of permanent structural or functional modifications adopted by organisms to survive in their environment.
Structural adaptation involves physical modifications in anatomy, such as wide padded soles in camels for sand traversal and cactus leaves modified into spines to reduce water transpiration.
Functional adaptation involves modifications in physiological working mechanisms, such as desert animals sweating less to conserve water and thick blubber layers in Arctic mammals for cold insulation.

Biogeochemical Cycles and Natural Resources

Biogeochemical cycles are pathways through which essential chemical nutrients circulate continuously between abiotic and biotic environments.
Primary natural cycles include the water cycle (evaporation, condensation, precipitation, runoff), the carbon cycle, the nitrogen cycle (fixation, nitrification, denitrification), and the phosphorus cycle.
Must knowNatural resources are classified into renewable resources (replenished repeatedly via natural processes in a short timeframe, such as solar energy, air, water, and soil) and non-renewable resources (limited deposits that take millions of years to form, such as coal, petroleum, minerals, and natural gas).
Conservation of natural resources is imperative for maintaining ecological equilibrium and ensuring sustainable development for future generations.

Milestones in Ecology and Environmental Concepts

Ernst Haeckel introduced the term Ecology in 1866, deriving it from the Greek words *Oikos* (home) and *Logos* (study).
Must knowA.G. Tansley proposed the term Ecosystem in 1935, formulating its conceptual framework as an integrated ecological unit.
The term Biosphere was coined in 1875 by Eduard Suess to designate the global zone supporting living organisms.
Charles Elton introduced key ecological concepts in 1927, including the food chain, food web, ecological pyramid, and ecological niche (concept formalized), though the term *niche* was earlier introduced by Joseph Grinnell in 1917.
Howard T. Odum established in 1956 that the pyramid of energy is always upright.
The concept of Sustainable Development was defined in 1987 by the Brundtland Commission as development that meets current needs without compromising future generations.

Concept / Term	Formulated By	Year	Key Contribution / Meaning
Ecology	Ernst Haeckel	1866	Coined the term derived from Greek Oikos and Logos
Ecosystem	A.G. Tansley	1935	Coined the term and framed ecosystem concepts
Biosphere	Eduard Suess	1875	Coined the term for life-supporting sphere of Earth
10% Energy Law	Raymond Lindeman	1942	Only 10% energy transfers to next trophic level
Energy Pyramid	Howard T. Odum	1956	Proved energy pyramid is always upright
Sustainable Development	Brundtland Commission	1987	Development meeting present and future needs

Water and Forest Resources

Water covers approximately 71% of Earth's surface, of which 97% is saline water in oceans and approximately 3% is fresh water.
Glaciers and polar ice caps contain about 68.7% of all fresh water, 30.1% exists as groundwater, and only 1.2% occurs in surface waters like lakes, rivers, wetlands, and the atmosphere.
Drip irrigation delivers water directly to plant root zones, conserving 30% to 70% of applied water, whereas sprinkler systems conserve 20% to 40%.
According to the India State of Forest Report (ISFR) 2023, India's total forest cover is 7.15 crore hectares, constituting 21.76% of total geographical area.
Must knowThe Chipko Movement originated in 1973 in Uttarakhand under the leadership of Sunderlal Bahuguna and Chandi Prasad Bhatt, popularizing the slogan: "What are the gifts of the forest? Soil, water, and pure air!"

Environmental Pollution and Atmospheric Problems

Must knowPrimary pollutants are emitted directly into the environment (CO, SO2, particulate matter), whereas secondary pollutants form via atmospheric chemical reactions (O3, PAN, H2SO4).
Safe ambient noise level is capped around 55 dB; sustained sound levels beyond this threshold are damaging to hearing.
Acid rain is caused primarily by emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx / NO2), reacting with atmospheric moisture to form sulfurous/sulfuric acid (H2SO3, H2SO4) and nitric acid (HNO3), lowering rainwater pH below 5.6.
The greenhouse effect is driven mainly by carbon dioxide (CO2), along with methane (CH4), nitrous oxide (N2O), CFCs, and water vapor.
Must knowThe Montreal Protocol was signed in 1987 to phase out ozone-depleting chlorofluorocarbons (CFCs); World Ozone Day is celebrated globally on 16 September.
Classical smog forms in cool, humid climates containing smoke, fog, and SO2 (e.g., London Smog 1952), while photochemical smog develops in sunny, dry weather from NOx, VOCs, and ozone.

Protected Areas, Ramsar Sites, and Environmental Laws

Protected areas differ by objective and regulation: National Parks offer full statutory habitat protection prohibiting human activities, Wildlife Sanctuaries permit limited regulated activities, and Biosphere Reserves integrate core, buffer, and transition zones.
Must knowIndia's first National Park was Jim Corbett National Park established in 1936, and India's first Biosphere Reserve was Nilgiri Biosphere Reserve established in 1986.
Under the 1971 Ramsar Convention signed in Iran, India designated its first Ramsar sites in 1981: Chilika Lake (Odisha) and Keoladeo National Park (Rajasthan).
The Environment (Protection) Act, 1986 was enacted following the tragic 1984 Bhopal Gas Leak disaster to provide broad regulatory power to the central government.
The 3R principle for waste management stands for: Reduce, Reuse, and Recycle.
Key statutory certification marks include Ecomark (earthen pot symbol for eco-friendly products), Agmark (agricultural quality by DMI), ISI and Hallmark (industrial and gold jewellery purity by BIS).

Protected Area Type	Governing Act / Program	Human Activities	Core Objective
National Park	Wildlife Protection Act, 1972	Strictly prohibited	Complete species and habitat protection
Wildlife Sanctuary	Wildlife Protection Act, 1972	Limited permissions granted	Protection of specific wildlife species
Biosphere Reserve	UNESCO MAB Programme	Zoned (Core, Buffer, Transition)	Ecosystem conservation and scientific research
Legislation / Agreement	Enactment Year	Primary Focus
Wildlife Protection Act	1972	Prevention of poaching and sanctuary/park creation
Water (Prevention & Control) Act	1974	Abatement of water pollution
Forest (Conservation) Act	1980	Restriction on non-forest use of forest land
Air (Prevention & Control) Act	1981	Control of industrial and ambient air emissions
Environment (Protection) Act	1986	Comprehensive umbrella law post-Bhopal disaster
Biological Diversity Act	2002	Equitable sharing and biodiversity conservation
National Green Tribunal (NGT) Act	2010	Fast-track resolution of environmental disputes

Key terms

Biotic Components: All living entities within an ecosystem, including producers, consumers, and decomposers.
Abiotic Components: Non-living physical and chemical elements of an environment, such as sunlight, water, minerals, and air.
Lindeman's 10% Law: Ecological principle stating only 10% of consumed energy transfers to the next trophic level.
Biomagnification: Progressive accumulation and increasing concentration of toxic chemicals (like DDT) along successive levels of a food chain.
Primary Pollutant: Harmful substance released directly into the atmosphere, such as CO, SO2, and soot particles.
Secondary Pollutant: Pollutant synthesized in the atmosphere through chemical reactions between primary pollutants, such as ground-level ozone and PAN.
Acid Rain: Precipitation with a pH below 5.6 caused by airborne sulfur dioxide and nitrogen oxides reacting with water.
Ecomark: Indian quality label featuring an earthen pot awarded to consumer goods meeting environmental friendliness standards.
Agmark: Statutory certification mark issued by the Directorate of Marketing and Inspection for agricultural commodities.

Formulas

10% Law energy transfer = Initial Energy x 0.10: Calculates the energy reaching the subsequent trophic level.

Quick revision

Read these the night before the exam.

Ernst Haeckel coined the term Ecology in 1866 from the Greek roots Oikos and Logos.
A.G. Tansley proposed the term Ecosystem in the year 1935.
Raymond Lindeman formulated the 10% energy transfer law in 1942.
Howard T. Odum demonstrated that the ecological pyramid of energy is always upright.
Jim Corbett National Park, founded in 1936, is India's first national park.
Nilgiri Biosphere Reserve was established in 1986 as India's first biosphere reserve.
Chilika Lake and Keoladeo National Park became India's first Ramsar wetland sites in 1981.
Project Tiger was launched by the Government of India in 1973.
The Environment (Protection) Act was passed in 1986 following the 1984 Bhopal Gas Tragedy.
World Ozone Day is celebrated worldwide on 16 September.
World Environment Day is celebrated on 5 June.
Biodiesel is primarily extracted from the seeds of Jatropha (Ratanjot) and Karanj plants.

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