NCERT Solutions Class 4 EVS A River’s Tale

A River’s Tale

Questions with (*) sign are open ended questions.

Page 107

What is the colour of the river where it begins?

     Water is colourless, but seen from a distance it appears bluish colour.

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

     Fish needs fresh water to survive. At the places water is not polluted we can find much fish in the river water. At the places where water is polluted, we find a few or dead fish in the river water.

What can be seen in the river before it reaches the village?

     We can see a large number of fish in the river before it reaches the village.

At which places did the colour of the water in the river change? Why did this happen? Discuss.

     The colour of the water in the river changes near the villages and the towns.  The change in the colour of the water is due to pollution.

Which of the places shown in the picture would you like to live in? Why?

     I would like to live in places where water is not polluted in order to live a healthy life.

Would you like to change any of the things that you see in the picture? Why and how?

     I would like to take preventive measures to avoid water pollution.

Have you seen people throwing different things into rivers or water bodies?

     Yes.

Page 108

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

     I would like to drink water at the beginning of the river as the river water at the beginning is fresh and not polluted.

In the last part of the picture the river flows into the sea. Have you ever seen the sea? Where? In a movie, or somewhere else?

     Yes, I have seen the sea. As I live in Mumbai I have seen the sea.

Have you ever been near a river or sea? When?

     Yes, I have seen the river when I visited Nasik city. As I live in Mumbai I have seen the sea

Is the water from the sea drinkable? Why?

     The water from the sea is not drinkable as it is salty water.

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? Discuss.

     Yes, there would be changes taking place in a river, pond, or stream at different times of the year. During the rainy season, the water level increases and during the summer season the water level decreases.

Page 109

Will there be the same amount of water in the ponds or rivers during the rainy season and in summer?

     No, the level of water in the rainy season is more than the level of water in the summer.

Is there a pond, river or lake near your town or city?

     Yes, there is a lake in my city.

Find out–

Are there any changes in the water during summers, the rainy season and in winters?

     Yes, there are changes in the water during summers, the rainy season and in winters. In summer the water level decreases and in the rainy season the water level increases.

What are the different kinds of water animals found there?

     There are different kinds of fish found there.

What kind of trees and plants grow around it?

     There are different kinds of trees are planted by the Municipal Corporation.

What are the kinds of birds that come there?

     Eagle, crow, swan etc. come there.

Have you ever seen or read about floods? Where?

     Yes, Every year some parts of Mumbai city flood during the rainy season.

What happens when there is a flood?

     The roads and railway tracks flooded with water, even the houses in low-lying areas are flooded with water.

Have you seen dirty water in a river or pond? Where?

     Yes, I have seen dirty water in a river and pond also.

How would you know if the water is dirty? If the water looks clean, can you be sure that it is alright to drink that water? Discuss.

     We can know the water is dirty by its colour and the smell. Even if the water looks clean, we cannot be sure the water is drinkable. Clean water also contains many germs which cannot be seen with our naked eyes.

Page 111

Things Dissolved (mixed) in water Did not dissolve in water Colour of water changes Could not be seen in the water
Sugar  
Salt
Lemon Juice
Soap Water
Flour
Dal
Sherbet
Cooking Soda
Oil

 

Answer:

Things Dissolved (mixed) in water Did not dissolve in water Colour of water changes Could not be seen in the water
Sugar
Salt
Lemon Juice
Soap Water
Flour
Dal
Sherbet
Cooking Soda
Oil

 

Now on the basis of your observations tell –

Do all things dissolve in water?

     No, not all things dissolve in water.

Does the colour of the water always change?

     No, the colour of the water may not always change.

Did oil dissolve in water? How can you say whether it has dissolved or not?

     No, oil does not dissolve in water. Oil settles at the upper part.

The Colour of the water may not change even after some things are dissolved in it. Would you say that these are absent in water?

     No, some of the things dissolve in water but the colour does not change.

 

Additional Questions:

Write whether True or False.

1). At some places, there are many fish in the river, at others there are only a few and at some places, there are dead fish.

     True.

2). A river flows into the sea.

     True.

3). Water from the sea is drinkable.

     False.

4). If the water looks clean then it is drinkable water.

     False.

5). Many things dissolve easily in the water.

     True.

Give reason

1). We should boil the drinking water.

     There are many things that dissolve easily in water. Some of these can be very harmful to our body. Hence, it is important that we clean water before drinking it. One of the best ways to do this is to boil the water.

Click here for the solutions of 

1). Going to School

2). Ear to Ear

3). A Day With Nandu

4). The Sory of Amrita

5). Anita and the Honeybees

6). Omana’s Journey

7). From the Window

8). Reaching Grandma’s Home

9). Changing Families

10). Hu Tu Tu Hu Tu Tu

11). The Valley of Flowers

 

 

 

 

 

 

 

 

 

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