Environmental Protection

Overview

Environmental Protection is a core topic in the EVS section of OTET Paper I, directly testing candidates on pollution types, climate change mechanisms, and conservation strategies. This topic bridges science and social awareness, making it ideal for integrated questions that assess both factual recall and application to real-life situations.

For OTET, you must know the causes, effects, and control measures for each pollution type, understand the greenhouse effect and global warming, and be familiar with conservation efforts at local (Odisha) and national levels. Questions often link environmental issues to child-friendly contexts—what children observe in their surroundings—so expect scenario-based questions about waste disposal, water conservation, or tree planting activities.

Key Concepts

• **Pollution** is the introduction of harmful substances (pollutants) into the environment that cause adverse changes to air, water, soil, or living organisms.

• **Air pollution** results mainly from vehicle emissions, industrial smoke, burning of fossil fuels, and crop residue burning. Major pollutants include carbon monoxide (CO), sulphur dioxide (SO₂), nitrogen oxides (NOₓ), and particulate matter (PM 2.5 and PM 10).

• **Water pollution** occurs when untreated sewage, industrial effluents, agricultural runoff (pesticides, fertilizers), and plastic waste contaminate rivers, lakes, and groundwater.

• **Soil pollution** is caused by excessive use of chemical fertilizers, pesticides, improper waste disposal, and industrial waste. It reduces soil fertility and enters the food chain.

• **Noise pollution** refers to excessive or harmful levels of sound from vehicles, loudspeakers, construction, and factories. It affects hearing and causes stress.

• **The greenhouse effect** is a natural process where gases like carbon dioxide (CO₂), methane (CH₄), and water vapour trap heat in the atmosphere, keeping Earth warm enough for life.

• **Global warming** is the enhanced greenhouse effect caused by human activities—burning fossil fuels, deforestation—leading to a rise in Earth's average temperature.

• **Climate change** refers to long-term shifts in temperature, rainfall patterns, and extreme weather events resulting from global warming.

• **Conservation** means the sustainable use and protection of natural resources—forests, water, wildlife, and soil—for present and future generations.

Key Facts

| Fact | Detail | |------|--------| | Main air pollutants | CO, SO₂, NOₓ, PM 2.5, PM 10, ozone (ground-level) | | Main water pollutants | Sewage, industrial effluents, pesticides, heavy metals, plastics | | Greenhouse gases (GHGs) | CO₂ (most abundant), CH₄, nitrous oxide (N₂O), CFCs | | Global warming benchmark | Limiting rise to 1.5°C above pre-industrial levels (Paris Agreement, 2015) | | Ozone layer | Protects Earth from UV rays; depleted by CFCs | | Chipko Movement | 1973, Uttarakhand—villagers hugged trees to prevent felling | | Project Tiger | Launched 1973 to protect tigers and their habitats | | Odisha's Simlipal | Biosphere Reserve and Tiger Reserve in Mayurbhanj district | | Chilika Lake | Ramsar Wetland site; habitat for Irrawaddy dolphins and migratory birds | | 3R principle | Reduce, Reuse, Recycle—waste management strategy | | Van Mahotsav | Annual tree-planting festival in July across India | | National parks in Odisha | Simlipal, Bhitarkanika (mangroves and crocodiles) |