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NCERT Solutions for Class 4 EVS
Chapter 13 - A River’s Tale
NCERT Page No. 107
Look at the pictures and answer the following questions:
(a) What is the colour of the river where it begins?
(b) 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.
(c) What can be seen in the river before it reaches the village?
(d) At which places did the colour of the water in the river change? Why did this happen? Discuss.
(e) Which of the places shown in the picture would you like to live in? Why?
(f) Would you like to change any of the things that you see in the picture? Why and how?
(g) Have you seen people throwing different things into rivers or water bodies?
(h) What could be done to keep rivers clean? Discuss.
(a) The colour of the river appears blue at the place where it begins.
(b) Fish can survive better in fresh and clean water. But near the villages and towns, people pollute water by throwing poisonous waste and garbage. This makes water unfit for the fish and as a result, a large number of fish many of them die.
(c) A large number of fish can be seen in the river before it reaches the village.
(d) The colour of the water in the river changes when it enters the city, town or village. This happens because the industrial waste, garbage and sewage are thrown into it which make it highly polluted.
(e) I would like to live near the place from where the river begins because I can get fresh air and fresh water at that place.
(f) I would like to make the place clean by removing all the waste so that the water can be made clean and fit for consumption.
(g) Yes, I have seen people throwing coins, ashes of dead humans, religious statues, etc., in water. I have also seen some people living near the rivers throwing garbage in the river water.
(h) People should not wash their clothes and bathe their animals in the river water. The sewage and the industrial waste should not be dumped directly into the river. Both sewage and the industrial waste should be first treated to remove the harmful chemicals before dumping into rivers.
NCERT Page No. 108
(a) If you wanted to drink some water, from which part of the river would you like to drink? Why?
(b) 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?
(c) Have you ever been near a river or sea? When?
(d) Show with your hands, how the waves in the sea move.
(e) Is the water from the sea drinkable? Why?
(f) 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.
(a) I would like to drink water from the beginning part of the river because the water at this place is pure, clean and safe for drinking.
(b) Yes, I have seen the sea. I have seen it in the movies only.
(c) Yes, I have been near the Gngariver while attending aarti at Haridwar.
(d) Sea waves move up and down.
(e) No, the water from the sea is not drinkable because it is very salty.
(f) Yes, there would be changes taking place in a river, pond or stream at different times of the year. For example, in hot summers, the water level of rivers, ponds or streams, decreases due to the evaporation of water. In the rainy season, the water level of all the water bodies rises. In winters, the water of the ponds at some places freezes due very cold conditions.
NCERT Page No. 109
1. Will there be the same amount of water in the ponds or rivers during the rainy season and in summer?
No, there will not be the same amount of water in the ponds or rivers during the rainy season and in summer. But the amount of water in the rainy season will be more than in summer.
2. Is there a pond, river or lake near your town or city?
(a) Are there any changes in the water during summers, the rainy season and in winters?
(b) What are the different kinds of fish found there?
(c) What kind of trees and plants grow around it?
(d) What are the kinds of birds that come there?
(e) Have you ever seen or read about floods? Where?
(f) What happens when there is a flood?
(g) Have you seen dirty water in a river or pond?
(h) 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.
Yes, there is a river near our town.
(a) Yes, in hot summers the water level of the river is quite low and in rainy season the water level is very high. In winters, the level of water remains normal.
(b) There are many different kinds of fish of different sizes.
(c) Many large and thick trees and bushy plants grow around it.
(d) Various kinds of birds like eagle, crow, swan, etc. come there.
(e) Yes, I have read about the floods in Kerala.
(f) All the houses, roads, fields, etc. get covered by water. I becomes difficult for people to survive at such places.
(g) Yes, I have seen dirty water in the rivers and ponds.
(h) If water does not look clean and clear then it is said to be dirty. No, if the water looks clean even then we cannot be sure that it is alright to drink that water.
NCERT Page No. 112
(a) How is drinking water cleaned in your house?
(b) Find out the many different ways of cleaning water at home.
(c) Draw pictures showing any two ways of cleaning the water.
(a) We use electric water purifier to clean water at our home.
(b) Water can be cleaned by following different ways:
- By boiling the water
- By adding alum to water
- By adding chlorine to water
- By filtering water using water purifiers
(c) (i) Boiling of water
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