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.