A River’s Tale Class 4 Notes CBSE EVS Chapter 13 (Free PDF Download)

Summary of A River’s Tale

• The impact of man's activities on a river is the subject of this chapter.

• It explains how the river becomes polluted and what steps must be taken to rescue it. 

• The chapter also discusses the sea and why we are unable to consume seawater.
  
  

Sea

• A sea is a vast body of salt water that is partially encircled by land and covers the Earth.

River

• A river is a naturally flowing watercourse that flows towards an ocean, sea, lake, or another river, and is usually freshwater.

Points to Remember About the River

• Colour of the river - water is colorless. When we look at water in a river from afar, it appears to be bluish in color.

• There must be a starting point for a river. The source is the area where it all begins.

• A river's source is typically a hill or a mountain.

• Most rivers begin as a little stream. Several little streams eventually join to become a river.

• A river must come to an end at some point.

• A river's mouth is the place where it meets the water.

• The river's mouth will discharge the water into the sea, oceans, or a huge lake.

• The Nile River is the world's longest river.

How Does the River Get Polluted?

Water pollution is caused by a variety of human activities. Some of them are mentioned below:

• Washing utensils

• Bathing animals

• Cleaning utensils

• Wastewater 

• Industrial waste

Water Pollution

• Water pollution occurs when chemicals contaminate water sources, rendering the water unfit for drinking, cooking, cleaning, swimming, and other activities. 

Soluble Substances

• Soluble compounds are those that dissolve in water. Some of the examples are sugar and salt.

Insoluble Substances

• Insoluble substances are those that do not dissolve in water. Insoluble substances include things like sand and wheat.

Soluble or Insoluble – find Out?

• You will need to bring a few items from home for this exercise. 

• The majority of these can be found in the kitchen.

• 5 or 6 glasses

• Fill each bottle or glass halfway with water. 

• Ascertain that everyone has the same amount of water. 

• Put each of the items in the water one by one.

• For instance, put haldi in the first glass, oil in the second glass, and soda in the third glass until each glass is empty. 

• In a bowl of water, combine all the ingredients and observe what occurs. 

Fill in the table with your observations:

So, what did you notice? Place the (   ) ma ✓ in the appropriate locations.

How to Keep Rivers Clean?

• People who live near the river's edge should not bathe their pets or wash their clothes in it. 

• The river should not be used to dispose of industrial trash or sewage. 

• Before releasing sewage into the river, treatment plants should be established to remove contaminants.

How is Drinking Water Get Cleaned in Our House?

Water can be disinfected by filtering and adding chlorine tablets, or by filtering and mixing chlorine tablets and adding alum.

Why We are Unable To Drink Sea Water?

• All rivers eventually merge into the sea, thus if a river is polluted, the seawater will be polluted as well. 

• In addition, companies discharge rubbish into the water, and sewage from cities near the sea is a major cause of pollution.

• Sea water is salty and contains a variety of contaminants that are unfit for human consumption.

• Ships, oil leaks, and other factors contaminate seawater.

Practice Questions

Q1. In some places, there are many fish in the river, in others, there are only a few and in some places, there are dead fish. What could be the reason for this? Discuss.

Ans: Fresh water is required by aquatic animals such as fish. Many fish would live in the water of a river that was not polluted. Similarly, in areas where factory and domestic wastes are dumped into rivers, the water becomes polluted, killing fish and aquatic plants.

Q2. If you wanted to drink some water, from which part of the river would you like to drink? Why?

Ans: I would like to drink water at the upper reaches from the beginning of the river. The water near the source of a river is pure and uncontaminated.

Importance of CBSE Class 4 EVS Chapter 13 A Rivers Tale

Chapter 13 is all about rivers feeding us with water and how we are polluting them. This chapter explains how we are dependent on the rivers. It also tells us how we exploit this water source to a considerable level.

It teaches us how the water is becoming dirty and we are continuing our harmful acts. The different actions we do every day are messing with the sanctity of the river water and affecting the animals living in it.

Class 4 EVS Chapter 13 A Rivers Tale will also explain where we get drinking water from. We will learn how the water crisis can cause serious damage to our civilization. You will also learn how the dirty rivers are flowing into the sea and causing harm to marine life.

To understand this chapter well, refer to the revision notes prepared by the experts of Vedantu. These notes will explain where we need to stop and how we can keep the rivers clean.

Benefits of Vedantu’s Class 4 EVS Chapter 13 A Rivers Tale Notes

• These notes have an easy explanation of the river pollution problem we are facing. You will get a good idea of how we are making the rivers dirty. Understand the activities we do every day in the rivers and make the rivers polluted.

• All the sentences in this chapter will be explained very well. You will get to know why the colour of the river changes in its course to the plains.

• Solve the notes provided with the notes to test your skills. Find out where you need to work more to make your preparation better.

Download A Rivers Tale Class 4 EVS Revision Notes

Get the revision notes on free PDF versions. Use them according to your study sessions and resolve doubts on your own. Understand the concepts explained in this chapter better. Solving the notes will also guide you to formulate accurate answers to the questions and help you score more in the exams.

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