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Chapter Analysis
Beginner4 pages • EnglishQuick Summary
Chapter 13, 'A River's Tale', explores how rivers change and become polluted as they pass through villages, towns, and cities. The chapter encourages students to observe the impact of human activities on river water, such as washing clothes and disposing waste, which make the water dirty. It also raises awareness about the importance of keeping water bodies clean and emphasizes that although many substances dissolve in water, not all are harmless.
Key Topics
- •Water pollution and its causes
- •Human impact on rivers
- •Methods of water purification
- •Ecological balance in aquatic environments
- •Seasonal effects on water bodies
Learning Objectives
- ✓Identify the causes and effects of water pollution.
- ✓Explain the importance of clean water bodies for ecosystems and humans.
- ✓Explore practical ways to purify and conserve water.
- ✓Understand the impact of human activities on natural water sources.
- ✓Recognize seasonal variations in water bodies and their ecological significance.
Questions in Chapter
What is the colour of the river where it begins?
Page 107
At which places did the colour of the water in the river change? Why did this happen?
Page 107
What could be done to keep rivers clean?
Page 108
Do you think that there would be changes taking place in a river, pond, or stream at different times of the year? What kind of changes would these be?
Page 109
How does water become dirty as it flows through various places?
Page 112
What are some ways to clean drinking water?
Page 112
Additional Practice Questions
Discuss the importance of keeping rivers and other water bodies clean.
mediumAnswer: Keeping rivers clean is crucial for maintaining biodiversity, ensuring safe drinking water, and preventing pollution. Clean water bodies support various aquatic ecosystems and provide recreational and commercial benefits for humans. Pollution prevention can be achieved through better waste management practices and reducing industrial discharge.
Imagine if all substances dissolved in water. How would this affect aquatic life and human usage of water?
hardAnswer: If all substances dissolved in water, it could harm aquatic life by creating toxic environments where living conditions are unsustainable. For humans, it would complicate water purification processes as harmful substances would easily pollute water sources used for drinking and agriculture. The ecosystem balance would be severely impacted.
Why is it recommended to boil water before drinking?
easyAnswer: Boiling water is recommended to kill harmful microorganisms, such as bacteria and viruses, that may be present in the water. It is an effective way to ensure water safety, especially when other purification methods are not available.
How do seasonal changes affect the water levels in rivers, ponds, or lakes?
mediumAnswer: Seasonal changes greatly affect water levels; during rainy seasons, water bodies are replenished and levels rise, whereas in summer, evaporation can reduce the water level significantly. Seasonal rainfall directly impacts the flow and availability of water in these bodies.
What are some signs you can observe to determine if river water is dirty?
easyAnswer: Signs of dirty river water include unpleasant odor, visible debris and waste, change in color, presence of dead fish, and excess algae growth. These indicators suggest pollution and the presence of harmful chemicals or organic waste.