Water
About 6 min · Environmental Studies (Paper I) · English
Time worked out from the lesson's 339 words at 150 words a minute, plus a minute for each question.
Water is a fundamental topic in Environmental Studies (EVS) for AP TET Paper I, connecting science concepts with everyday life experiences of children. This topic integrates multiple learning areas—natural phenomena, health, conservation, and civic responsibility—making it ideal for application-based questions.
Key ideas
- Water as a universal solvent: Water dissolves more substances than any other liquid, which explains both its usefulness and how it gets contaminated easily.
- Three states of water: Water exists as solid (ice), liquid (water), and gas (water vapour); children observe these transitions in daily life through ice cubes, boiling water, and morning dew.
- Water cycle (Hydrological cycle): Continuous movement of water through evaporation → condensation → precipitation → collection; this cycle purifies and redistributes water naturally.
- Sources classification: Water sources are either surface water (rivers, lakes, ponds) or groundwater (wells, borewells, springs); Andhra Pradesh depends heavily on Krishna and Godavari river systems.
- Potable vs non-potable water: Only about 1% of Earth's water is fresh and accessible; distinguishing safe drinking water from contaminated water is a critical life skill.
Quick reference
- Water cycle sequence: Evaporation → Condensation → Precipitation → Collection (remember: "Every Child Plays Cricket")
- 3-2-1 of Earth's water: 3% fresh, 2% frozen, less than 1% accessible
- Big 3 water-borne diseases: Cholera, Typhoid, Hepatitis A (all spread through faecal-oral route)
- Simplest purification: Boiling for 10-20 minutes kills most disease-causing organisms
- AP's lifelines: Krishna and Godavari—know Nagarjuna Sagar and Srisailam dams
Check yourself: 3 questions
1. Which of the following is NOT a natural source of fresh water?
2. In the water cycle, which process describes the conversion of water vapor in the air into liquid water droplets that form clouds?
3. A village gets its drinking water from a well. During summer, the water level in the well drops significantly. Which water conservation method would be most effective for this village to maintain the water level throughout the year?
This lesson is cut from the topic's note, not rewritten. Fact-checked on 18 Oct 2026: an AI-assisted check of this note against cited sources; the errors it found were corrected that day. Some errors may remain. The questions are from Shishya's validated question bank.
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