TU B.Sc. First Year Environmental Science (Env. 101) — Complete Syllabus Overview
Environmental Science is one of the major subjects offered under the Four-Year Bachelor of Science (B.Sc.) programme of Tribhuvan University’s Institute of Science and Technology (IoST), Kirtipur, Kathmandu. The First Year Environmental Science course, officially titled Introductory Environmental Science (Course No. Env. 101), is a 100-mark theory paper accompanied by a 50-mark practical paper (Env. 102), making the combined First Year Environmental Science assessment worth 150 marks.
Tribhuvan University introduced Environmental Science at the Bachelor’s level in 1997 — making it one of the first Nepali universities to recognize the discipline formally — and upgraded the programme from three to four years in 2012. After one full syllabus cycle, revisions were made in 2016 (2073 BS) to incorporate more applied, contemporary subjects including climate change, disaster risk management, and advances in environmental modelling. The current syllabus is the Revised Course of Study 2073.
Subject Information at a Glance
- Course Title: Introductory Environmental Science
- Course No.: Env. 101 (Theory) | Env. 102 (Practical)
- Year: First Year — Four Year B.Sc. Programme
- Full Marks: 100 (Theory) + 50 (Practical) = 150 total
- Pass Marks: 35 (Theory) | 20 (Practical) — both must be passed separately
- Total Lecture Hours: 150 (Theory)
- Examination: Annual (end-of-year exam conducted by IoST, TU)
- Conducting Institution: Institute of Science and Technology (IoST), Tribhuvan University
- Curriculum Version: Revised Course of Study 2073 BS (2016)
- Stream Placement: Biological Group (students take Env. 101 alongside Chemistry and Botany or Zoology)
- Eligibility: NEB Grade 12 or equivalent in Biological Science stream with minimum C grade in all subjects
Why Environmental Science?
Environmental Science is an inherently interdisciplinary subject — it draws from ecology, biology, chemistry, physics, geology, atmospheric science, hydrology, and social science to understand how natural systems function and how human activities affect them. In Nepal’s context, this interdisciplinary foundation has particular importance: Nepal is one of the world’s most biodiversity-rich countries and simultaneously one of the most climate-vulnerable, with glacial lake outburst floods (GLOFs), landslides, earthquake risks, forest degradation, water resource stress, and air quality crises all posing active challenges to sustainable development.
The TU B.Sc. Environmental Science programme is designed with Nepal’s ecological and policy context explicitly in mind. The four-year structure progresses from introductory environmental principles in First Year through environmental chemistry, hydrology, geology, and ecology in Second Year, advanced applied topics including pollution management, disaster risk, and GIS in Third Year, and conservation management and specialized applied subjects in Fourth Year. Graduates work in environmental impact assessment (EIA), conservation biology, environmental consulting, NGO/INGO programme management, government environmental agencies, urban planning, and research institutions across Nepal and internationally.
Env. 101 Theory Syllabus — Unit-wise Detail
Unit 1: Introduction to Environmental Science
- Concept of environment and environmental science: definitions, historical development of the discipline, objectives, scope, and importance
- Interdisciplinary and multidisciplinary nature of environmental science: relationship with ecology, biology, chemistry, physics, geology, meteorology, hydrology, sociology, and economics
- The four spheres of the Earth: interconnectedness of the lithosphere, hydrosphere, atmosphere, and biosphere as an integrated Earth system
- Environmental issues in Nepal: current state of environmental awareness, role of environmental science in Nepal’s development; major environmental challenges (deforestation, soil erosion, water pollution, urban air quality, waste management, glacier retreat)
- Historical and philosophical basis: relationship between society and environment through history
- Human civilization and environment: concept of culture and human civilization; historical development of society — hunting and gathering, pastoral, agrarian, industrial, and post-industrial society — and their characteristic relationships with natural resources and environmental impact
- Mode of production, resource utilization, and environment: how production systems determine resource extraction patterns and environmental pressures
- Population growth and environmental degradation: linkage between population dynamics, resource consumption, and ecological carrying capacity
- Use of sociological and anthropological knowledge in environment conservation: indigenous knowledge systems, traditional ecological knowledge (TEK), and community-based conservation
- Environmental worldviews and ethics: anthropocentric vs. ecocentric worldviews; ethics of sustainable use; developed countries vs. developing countries in environmental responsibility; concept of intergenerational equity
- Sustainability and sustainable development: Brundtland Commission definition, pillars of sustainable development (environmental, economic, social), sustainable development goals (SDGs) relevant to Nepal
Unit 2: Population and Community Ecology
- Ecology: concept, history, scope, branches (autecology and synecology), and levels of ecological organization (organism → population → community → ecosystem → biosphere)
- Population characteristics: size and density, pattern of dispersion (random, uniform, clumped), age structure (age pyramids), natality, mortality, biotic potential, and environmental resistance
- Population dynamics and theory of population growth: exponential growth model (J-curve), logistic growth model (S-curve), carrying capacity (K), overshoot and crash
- Rate of natural increase (r): calculation and significance; survivorship curves (Types I, II, III)
- Species interactions: positive interactions (mutualism, commensalism, protocooperation), negative interactions (predation, competition, parasitism, amensalism, herbivory), and neutral interactions; Lotka-Volterra predator-prey equations (concept)
- Regulation of population size: density-dependent and density-independent factors
- Community characteristics: classification (plant communities, animal communities, microbial communities) and composition
- Characters used in community structure: analytical characters (frequency, density, coverage, importance value index — IVI) and synthetic characters (presence, constancy, fidelity, sociability)
- Concept of ecological dominance: dominant, subdominant, influent species
- Habitat and niche: concept of habitat vs. ecological niche; fundamental niche vs. realized niche; niche breadth and niche partitioning
- Ecological indicators and keystone species: definition and examples relevant to Nepal
- Ecotone and edge effect: definition, characteristics, edge species
- Heterogeneity and equitability: species richness, species diversity indices (Shannon-Wiener, Simpson’s), evenness
Unit 3: Ecosystem Dynamics
- Terrestrial and aquatic ecosystems: structural and functional aspects of forest, grassland, desert, lentic (lake, pond) and lotic (river, stream) environments; Nepal-specific ecosystem types (alpine, subalpine, montane, subtropical, tropical forest; Terai wetlands, high altitude lakes)
- Energy sources for ecosystem dynamics: solar radiation, chemosynthesis; photosynthetically active radiation (PAR)
- P/R ratio: significance in autotrophic vs. heterotrophic ecosystems; ecological efficiency (Lindeman’s 10% law)
- Energy flow models: simple linear model, Y-shaped model (grazing + detritus pathways); application of thermodynamic laws (First and Second Laws) in ecosystems
- Productivity and its types: gross primary productivity (GPP), net primary productivity (NPP), secondary productivity; methods of measuring primary and secondary productivity (harvest method, O₂ method, radiocarbon method, satellite-based methods); global primary productivity patterns
- Biogeochemical cycles: hydrological cycle (evaporation, transpiration, precipitation, surface runoff, groundwater recharge); gaseous cycles — oxygen cycle, nitrogen cycle (N₂ fixation, nitrification, denitrification, ammonification), carbon cycle; sedimentary cycles — sulphur cycle, phosphorus cycle; human impacts on each cycle
- Ecological stability: carrying capacity, persistence, constancy, resilience; homeostasis and feedback mechanisms (negative feedback and positive feedback); ecosystem regulation
- Ecological succession and climax community: definition, types (primary and secondary succession; hydrosere, xerosere, lithosere), mechanisms (facilitation, tolerance, inhibition models), climax concept; examples from Nepal (forest succession after landslide, aquatic succession in mountain lakes)
- Human impacts on ecosystem: deforestation, habitat fragmentation, invasive species introduction, climate change effects on ecosystem structure and function
Unit 4: Environmental Chemistry
- Environmental analytical techniques: overview of analytical approaches used in environmental monitoring and research
- Volumetric analysis: acid-base titration, oxidation-reduction titration, complexometric titration (EDTA for water hardness), precipitation titration; applications in water quality analysis
- Gravimetric analysis: principles and applications in determination of total dissolved solids (TDS), suspended solids, and heavy metals in environmental samples
- Potentiometric titration: principle, electrode systems, pH measurement, applications in acid-base chemistry of environmental samples
- Conductometric titration: principle, instrumentation, applications in determining ionic concentration in water samples
- Colorimetric and spectrophotometric analysis: Beer-Lambert law, UV-Vis spectrophotometry, applications in determination of nitrates, phosphates, iron, heavy metals in water and soil
- Errors and statistical methods in chemical analysis: systematic errors, random errors, accuracy and precision, significant figures, mean, standard deviation, coefficient of variation, confidence intervals; application to environmental data quality assurance
Unit 5: Atmospheric Environment
- Origin, composition, and structure of the atmosphere: primordial atmosphere, present-day composition (N₂, O₂, Ar, CO₂, trace gases), vertical structure (troposphere, stratosphere, mesosphere, thermosphere, exosphere) — temperature profiles and characteristics of each layer
- Meteorological fundamentals:
- Radiation and heat budget: solar radiation, terrestrial radiation, albedo, global energy balance
- Temperature: lapse rate, temperature inversion (radiation, subsidence, frontal), urban heat island
- Pressure: pressure gradient, Coriolis effect, pressure systems (cyclones, anticyclones)
- Wind: geostrophic wind, surface winds, local winds (valley breeze, sea breeze, mountain winds relevant to Nepal’s terrain)
- Humidity and water vapour: absolute humidity, relative humidity, dew point, vapour pressure
- Clouds: cloud types (cirrus, cumulus, stratus, nimbus), cloud formation mechanisms
- Fog and precipitation: types of fog, types of precipitation (rain, snow, hail, sleet)
- Atmospheric stability: stable, unstable, and neutral atmosphere; lapse rate comparison (environmental vs. dry/moist adiabatic); adiabatic diagrams — slide and parcel methods
- Turbulence and diffusion: mechanical and thermal turbulence; atmospheric diffusion of pollutants; Gaussian plume model (concept)
- Scales of meteorology: microscale, mesoscale, synoptic scale, global scale
- Application of micrometeorology: to vegetated surfaces, urban areas, human beings, animals, and airports
- Meteorological factors affecting pollutant transport and diffusion: wind speed, wind direction, atmospheric stability, mixing height, temperature inversion, precipitation scavenging
- Wind roses: construction, interpretation, and application in pollution source identification
- Weather and climate: concept of weather vs. climate; weather forecasting methods (synoptic, numerical weather prediction); climate zones
- Climate change: introduction, evidence (temperature records, sea level rise, ice core data), causes (natural and anthropogenic), greenhouse effect and enhanced greenhouse effect, greenhouse gases (CO₂, CH₄, N₂O, O₃, H₂O) and their warming potential
- Atmospheric circulation: Hadley, Ferrel, and Polar cells; trade winds, westerlies; monsoon dynamics — Indian and South Asian monsoon, onset and retreat; El Niño/Southern Oscillation (ENSO) and La Niña and their effects on Nepal’s weather patterns
- Extreme weather events: thunderstorms, tornadoes, cyclones (Bay of Bengal cyclones affecting Nepal), and El Niño/La Niña teleconnections
Unit 6: Environmental Issues
- Air pollution: definition, classification of air pollutants (primary and secondary, gaseous and particulate), major air pollutants (SO₂, NOₓ, CO, hydrocarbons, ozone, PM₂.₅ and PM₁₀, heavy metals), sources (natural and anthropogenic), effects on human health, vegetation, materials, and ecosystems; air quality standards (WHO guidelines, Nepal standards); case study of Kathmandu Valley air quality
- Water pollution: definition, types of water pollutants (physical, chemical, biological), point and non-point sources, major water quality parameters (BOD, COD, DO, pH, TDS, coliform bacteria), effects on human health and aquatic ecosystems; water quality standards; river pollution in Nepal (Bagmati, Bishnumati rivers); drinking water quality in Nepal
- Soil pollution: causes (pesticides, heavy metals, industrial effluents, solid waste dumping, salinization), types, effects on soil fertility, food security, and human health; soil pollution in Nepal
- Noise pollution: sources, measurement (decibel scale), effects on human health (hearing loss, cardiovascular stress, psychological impacts), standards, and control measures
- Acid rain: formation (sulphur dioxide and nitrogen oxides + water → sulphuric and nitric acid), pH of acid rain, effects on aquatic ecosystems (lake acidification), forests (Waldsterben), soils, buildings and monuments, human health; long-range transport; acid rain in Himalayan context
- Global warming: enhanced greenhouse effect, projected temperature rise scenarios (IPCC), effects — rising sea levels, glacier melting in Nepal (Himalayan glaciers), changes in monsoon patterns, increased frequency of extreme weather events, species range shifts, impacts on Nepali agriculture and water resources
- Ozone depletion: stratospheric ozone layer and its role in UV filtration; ozone-depleting substances (ODS) — CFCs, HCFCs, halons, methyl bromide; Chapman cycle; catalytic ozone destruction; Antarctic and Arctic ozone holes; Montreal Protocol; recovery of ozone layer; effects of increased UV-B radiation on human health, ecosystems, and materials
- Nature conservation: approaches to biodiversity conservation in Nepal — in-situ conservation (national parks, wildlife reserves, conservation areas, buffer zones, Ramsar sites), ex-situ conservation (botanical gardens, zoological parks, seed banks, gene banks); landscape-level conservation; community forestry in Nepal as a conservation success model; protected areas of Nepal
Env. 102 Practical Syllabus (50 Marks)
1. Field and Laboratory Ecology
- Vegetation survey using quadrat method: species enumeration, density, frequency, coverage, and Importance Value Index (IVI) calculation
- Species-area curve for minimum quadrat size determination
- Minimum number of quadrats by sampling theory
- Soil pH, texture (feel method and sieve analysis), and organic matter/humus content determination
- Food web study of selected ecosystems (pond and grassland)
- Ecological adaptation study: field identification of hydrophytic and xerophytic plant adaptations
2. Water Quality Analysis
- Collection and preservation of water samples (surface water, tap water, waste water)
- pH measurement using pH meter and universal indicator
- Dissolved oxygen (DO) estimation by Winkler’s method in polluted and non-polluted water samples
- Biochemical oxygen demand (BOD) estimation: sample preparation, incubation, calculation
- Total dissolved solids (TDS) determination by gravimetric method
- Water hardness determination by EDTA complexometric titration (total, calcium, magnesium hardness)
- Chloride determination by argentometric titration (Mohr’s method)
- Nitrate determination by spectrophotometric method
- Turbidity measurement using turbidity meter
3. Soil Analysis
- Soil sample collection and preparation
- Soil pH determination
- Soil texture determination
- Soil organic matter determination by Walkley-Black method (or LOI method)
- Soil moisture content determination
4. Air Quality Assessment
- Construction and interpretation of wind roses from meteorological data
- Measurement of ambient temperature, humidity, and wind speed using standard instruments
- Observation and identification of cloud types
- Noise level measurement at different sites using a sound level meter and comparison with standards
- Preparation of air pollution monitoring data report
5. Environmental Data Interpretation
- Statistical analysis of environmental data: mean, standard deviation, coefficient of variation
- Graphical representation of ecological data (species-area curves, population growth curves, energy flow diagrams)
- Preparation of environmental field visit report
Recommended Textbooks and References
Ecology and Ecosystem Science
- Odum, E.P. and Barrett, G.W. Fundamentals of Ecology. Thomson Brooks/Cole (standard TU reference)
- Chapman, J.L. and Reiss, M.J. Ecology: Principles and Applications. Cambridge University Press
- Sharma, P.D. Ecology and Environment. Rastogi Publications, India
- Verma, P.S. and Agrawal, V.K. Principles of Ecology. S. Chand & Co. (P) Ltd., New Delhi
- Ambasht, R.S. Environment and Pollution. Students, Friends and Co., Varanasi, India
Environmental Science and Issues
- De, A.K. Environmental Chemistry. New Age International Ltd., New Delhi
- Bhagi, A.K. and Chatwal, G.R. Environmental Chemistry. Himalaya Publishing House, Mumbai
- Miller, G.T. and Spoolman, S.E. Living in the Environment. Cengage Learning
- Botkin, D.B. and Keller, E.A. Environmental Science: Earth as a Living Planet. John Wiley and Sons
Nepal-specific References
- Chaudhary, R.P. Biodiversity in Nepal. S. Devi, Saharanpur, UP, India, and Tecpress Books, Bangkok
- Banskota, K. and Sharma, B. Rapid Assessment of Mountain Environments: Methodology and Results. ICIMOD, Kathmandu
- His Majesty’s Government of Nepal / Government of Nepal. State of the Environment Nepal. Ministry of Population and Environment (latest edition)
- IPCC Reports — particularly chapters on South and Southeast Asia for climate change impacts relevant to Nepal
Atmospheric Science and Meteorology
- Ahrens, C.D. Meteorology Today: An Introduction to Weather, Climate, and the Environment. Cengage Learning
- Stull, R.B. Meteorology for Scientists and Engineers. Brooks/Cole
The Four-Year TU B.Sc. Environmental Science Programme Structure
First Year Environmental Science (Env. 101) is introductory and foundational — it establishes the conceptual framework, ecological principles, and environmental chemistry basics needed for all subsequent years. The four-year programme progresses as follows:
- First Year (Env. 101/102): Introductory Environmental Science — ecology, ecosystem dynamics, atmospheric science, environmental chemistry basics, and environmental issues
- Second Year (Env. 201/202): Fundamentals — environmental hydrology, geology, soil science, environmental microbiology, and advanced ecology
- Third Year: Applied subjects — Environmental Pollution and Management Tools (Env. 301), Disaster Risk Management, GIS and Remote Sensing, Solid Waste Management (Env. 304), and elective options
- Fourth Year: Specialized applied subjects — Biodiversity Conservation and Management (Env. 401), Environmental Impact Assessment (EIA), Climate Change, and a research project or field work component
Career Opportunities for TU B.Sc. Environmental Science Graduates
The growing emphasis on environmental governance, climate change adaptation, and sustainable development in Nepal has significantly expanded career opportunities for Environmental Science graduates. Key sectors include:
- Environmental Impact Assessment (EIA) and Initial Environmental Examination (IEE): consulting firms, government project teams, hydropower and infrastructure companies
- Government agencies: Department of Environment, Department of Forests and Soil Conservation, Department of Hydrology and Meteorology, Ministry of Forests and Environment
- International and national NGOs/INGOs: WWF Nepal, ICIMOD, IUCN Nepal, NTNC, conservation organizations
- Research institutions: ICIMOD (International Centre for Integrated Mountain Development), Nepal Academy of Science and Technology (NAST), university research departments
- Environmental education and journalism: secondary and higher secondary level teaching, environmental reporting
- Community forestry and biodiversity conservation: District Forest Offices, community forest user groups, buffer zone management
- Urban environment and waste management: metropolitan and municipal offices, waste management companies
- Climate change and disaster risk: NDRRMA, international climate finance projects, REDD+ programme implementation in Nepal
Difference Between NEB Grade 12 Biology and TU B.Sc. Environmental Science
Students entering TU B.Sc. Environmental Science from NEB Grade 12 Biology will find both familiar material (ecology, biodiversity, conservation) and significantly expanded content. The NEB Grade 12 Biology ecology unit covers food chains, ecological pyramids, and basic conservation in a few pages — TU Env. 101 devotes entire units to population and community ecology (with mathematical models of population growth, diversity indices, and niche theory), ecosystem dynamics (with thermodynamic applications, biogeochemical cycle chemistry, and succession mechanisms), and atmospheric science (with meteorological calculations, lapse rates, adiabatic diagrams, and monsoon dynamics). The Environmental Chemistry and Environmental Issues units also introduce laboratory analytical chemistry and formal environmental science methodology that have no direct equivalent in the NEB curriculum.
Tips to Succeed in TU B.Sc. First Year Environmental Science
- Understand the interdisciplinary framework early: Environmental Science draws simultaneously from biology, chemistry, physics, and social science. Students who approach it as a purely biological subject miss the atmospheric science, environmental chemistry, and social dimensions that carry significant marks. Read the introduction unit (Unit 1) carefully — it defines the conceptual framework for everything that follows.
- Prioritize ecosystem dynamics and atmospheric environment: Units 3 and 5 are the most content-rich units and consistently generate the most examination questions. Ecosystem dynamics requires strong understanding of biogeochemical cycles, energy flow models, thermodynamic laws in ecological context, and succession mechanisms. The Atmospheric Environment unit requires both qualitative understanding and some quantitative ability (lapse rates, stability diagrams, monsoon dynamics).
- For ecology, practice numerical calculations: Population ecology (Unit 2) includes calculations of population growth rates, carrying capacity, diversity indices, and IVI values from field data. These are directly tested in both the theory exam and the practical. Practice working through these calculations step by step.
- Connect content to Nepal throughout: This is not just good academic practice — it is explicitly examined. Questions routinely ask for Nepal-specific examples: protected areas, endemic/endangered species, Kathmandu Valley air quality, glacier retreat, community forestry, Ramsar sites, and monsoon patterns. Generic answers from Indian textbooks often miss these marks entirely.
- Maintain a complete practical notebook: The 50-mark practical exam covers water quality analysis, soil analysis, vegetation surveys, and atmospheric observation. All methods — Winkler’s DO method, EDTA titration for water hardness, IVI calculation, wind rose construction — must be understood well enough to perform independently in an exam setting.
- Use Odum and Barrett’s Fundamentals of Ecology as your primary reference: This is the most recommended ecology text across the TU B.Sc. Environmental Science programme and aligns closely with Units 2, 3, and 6. Supplement it with De’s Environmental Chemistry (Inorganic) for Unit 4, and Ahrens’ Meteorology Today for Unit 5.
- Master the environmental issues unit systematically: Unit 6 (Environmental Issues) covers six major topics — air pollution, water pollution, soil pollution, noise pollution, acid rain, global warming, and ozone depletion — each with sources, effects, standards, and control measures. Creating a comparative table for all six categories is an efficient revision strategy that also directly answers frequently asked “compare” and “list” examination questions.
Frequently Asked Questions (FAQs)
What is the course code for TU B.Sc. First Year Environmental Science?
The theory paper is Env. 101 (Introductory Environmental Science), carrying 100 marks with a pass mark of 35. The practical paper is Env. 102, carrying 50 marks with a pass mark of 20. Both must be passed independently.
How many units are in TU B.Sc. First Year Environmental Science?
Env. 101 has six units: Unit 1 (Introduction to Environmental Science), Unit 2 (Population and Community Ecology), Unit 3 (Ecosystem Dynamics), Unit 4 (Environmental Chemistry), Unit 5 (Atmospheric Environment), and Unit 6 (Environmental Issues).
When was TU B.Sc. Environmental Science introduced in Nepal?
Tribhuvan University introduced Environmental Science at the Bachelor’s level in 1997, making it one of the first Nepali universities to formalize the discipline. The programme was upgraded from three to four years in 2012, and the current syllabus was last revised in 2073 BS (2016) to incorporate contemporary topics such as climate change, disaster risk, and advanced modelling.
Is Environmental Science available to both biological and physical group students?
Env. 101 is placed in the Biological Group of the TU B.Sc. First Year programme — students typically take it alongside Chemistry and Botany or Zoology. However, Environmental Science (Env. 101) is also listed as an elective in the Physical Group alongside Physics and Mathematics, meaning it is technically accessible to both groups, though it is primarily designed for biology-background students.
What is the examination pattern for TU B.Sc. First Year Environmental Science?
TU B.Sc. uses an annual examination system. Both the theory exam (Env. 101, 100 marks) and the practical exam (Env. 102, 50 marks) are held at the end of the academic year by the IoST Examination Control Office. Pass marks are 35 (theory) and 20 (practical). Both must be passed separately.
How many institutions in Nepal offer B.Sc. Environmental Science under TU?
Currently, 14 institutions offer B.Sc. Environmental Science under Tribhuvan University in Nepal, with 7 of them located in Kathmandu district. The Central Department of Environmental Science (CDES) at IoST, Kirtipur also offers M.Sc. and Ph.D. programmes in Environmental Science.
Where can I find Environmental Science notes and past papers for TU B.Sc. First Year?
You can find study resources on nneducation.com. The official Env. 101 syllabus PDF is also embedded at the top of this page. For notes, bscnotesnepal.com maintains unit-wise Environmental Science notes for TU First Year. Past papers are available through the IoST TU official website (tuiost.edu.np) and EducateNepal.