About this previous year paper
Course: B.Tech (Semester IV)
Subject Code: EAS205
Subject Title: Environment and Ecology
Exam Type: Theory Examination
Duration: 3 Hours
Maximum Marks: 100
The paper tests students’ conceptual understanding of ecosystems, biodiversity, environmental pollution, conservation, and sustainability — with a mix of short definitions, descriptive questions, and applied environmental case studies.
SECTION – A (Short Questions – 10 × 2 = 20 Marks)
This section checks definitions and conceptual clarity. Topics include:
Eutrophication – nutrient enrichment of water bodies leading to algal bloom and oxygen depletion.
Synergism process – interaction of two or more factors producing a combined effect greater than their separate effects.
In situ vs. Ex situ conservation – protecting species within their natural habitat vs. outside it (e.g., national parks vs. zoos).
Blue Baby Syndrome – caused by nitrate-contaminated water reducing oxygen in infants’ blood.
Point vs. Non-point sources of pollution – direct discharge sources (factories) vs. diffuse sources (runoff).
Biomagnification – increasing concentration of toxins up the food chain.
Migration – movement of species between habitats (e.g., birds migrating seasonally).
Bioindicators – species indicating ecosystem health (e.g., lichens show air purity).
Upright ecological pyramid – energy pyramid, always upright due to energy loss at each trophic level.
Decomposers – organisms breaking down organic matter (e.g., fungi, bacteria).
Birth rate and death rate – key demographic measures.
Food chain – linear sequence of energy transfer between organisms.
SECTION – B (Descriptive – 5 × 10 = 50 Marks)
Students must attempt any five questions.
Structure of an ecosystem:
Biotic and abiotic components.
Producers, consumers, and decomposers.
Functions such as energy flow, nutrient cycling, and ecological balance.
Water-borne and water-induced diseases:
Cholera, typhoid, hepatitis, fluorosis, and arsenicosis — their causes and prevention.
Wildlife (Protection) Act, 1972:
Objectives, schedules, protected areas, and penalties for poaching or illegal trade.
Alternative Energy Resources:
Renewable: solar, wind, hydro, geothermal.
Non-renewable: coal, oil, natural gas.
Need for sustainable energy transitions.
Biodiversity Hotspots:
Concept introduced by Norman Myers.
Two major Indian hotspots: Eastern Himalayas and Western Ghats.
Landslides:
Causes (rainfall, deforestation, earthquakes), types (rotational, translational), consequences, and preventive measures.
Waterlogging and Salination:
Impact on soil fertility and agriculture; prevention through proper drainage and crop rotation.
Solid Waste Management:
Types (domestic, industrial, hazardous, e-waste).
Methods: landfilling, incineration, composting, recycling.
SECTION – C (Analytical / Long Questions – 2 × 15 = 30 Marks)
Students must attempt any two.
Sustainable Development:
Meeting present needs without compromising future generations.
Discussion on why true sustainability remains difficult (overpopulation, consumption, inequality).
Environmental Impact Assessment (EIA):
Definition, principles, and objectives.
Sequential stages: screening → scoping → impact prediction → mitigation → reporting → public consultation → monitoring.
Water Pollution:
Sources (industrial effluents, sewage, agricultural runoff).
Effects (eutrophication, toxicity, disease).
Water treatment processes: sedimentation, filtration, chlorination, aeration.
Layout of a water treatment plant showing key stages.
Key Themes Across the Paper
| Unit | Focus Area | Core Topics |
|---|---|---|
| I | Ecosystem & Biodiversity | Structure, functions, conservation |
| II | Environmental Pollution | Water, air, soil, and their effects |
| III | Natural Resources | Renewable vs non-renewable, alternative energy |
| IV | Environmental Legislation | Acts, EIA, Sustainable Development |
| V | Ecology & Human Welfare | Population, urbanization, resource management |
Summary
The EAS205 paper evaluates not only theoretical knowledge but also environmental awareness and problem-solving skills. It encourages students to connect ecology with real-world issues — such as pollution control, renewable energy, and sustainable development.
To perform well, students should:
Understand key definitions and ecological processes.
Write structured, point-based answers with examples.
Focus on interconnections — e.g., how biodiversity, pollution, and sustainability are linked.