Updated 2022 - NCERT Solutions for Class 6 Science Chapter 14 - Water

NCERT Solutions for Class 6 Science Chapter 14 - Water Includes all the NCERT Solutions for Science Class 6 Chapter 14 - Water. These NCERT Solutions for Class 6 Science Chapter 14 - Water. Contains questions their answers and solutions with detailed Explanation. If you are a student of Class 6 and use NCERT Text book to study then these NCERT Solutions for Class 6 Science Chapter 14 - Water are very useful for you to study well. On this page you not only get NCERT Solutions for Class 6 Science Chapter 14 - Water but you also get some very important extra questions of this chapter. On this page you find NCERT Solutions for Class 6 Science Chapter 14 - Water, Class 6 science chapter 14 question answer, Questions based on Chapter understanding, Some important definitions, Short answer Questions, Long answer Questions and some important Value based questions. For a better understanding of this chapter, you should also see Class 6 Science Chapter 14 Notes (pdf) based on NCERT for Class 6 Science Chapter 14 - Water.

- CHAPTER EXPLANATION -

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- CHAPTER OVERVIEW -

These Topics are covered in NCERT Class 6 Science Chapter 14 - Water.

- CHAPTER NOTES -

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- NCERT SOLUTIONS -

These NCERT Solutions for Class 6 Science Chapter 14 - Water Contains Answers and solutions for questions given in the Class 6 Science Chapter 14 NCERT Text Book Back Exercises. Here you get questions their answers and solutions with detailed Explanation of NCERT Class 6 Science Chapter 14 - Water, which helps you to understand the chapter with more clarity.

NCERT Solutions for Class 6 Science Chapter 14 - Water.

NCERT BACK EXERCISE SOLUTIONS

Q1. Fill up the blanks in the following:

(a) The process of changing of water into its vapour is called evaporation .

(b) The process of changing water vapour into water is called condensation .

(c) No rainfall for a year or more may lead to drought in that region.

(d) Excessive rains may cause flood .

Q2. State for each of the following whether it is due to evaporation or condensation:

(a) Water drops appear on the outer surface of a glass containing cold water.

Ans. Condensation

(b) Steam rising from wet clothes while they are ironed.

Ans. Evaporation

(c) Fog appearing on a cold winter morning.

Ans. Condensation

(d) Blackboard dries up after wiping it.

Ans. Evaporation

(e) Steam rising from a hot girdle when water is sprinkled on it.

Ans. Evaporation

Q3. Which of the following statements are “true”?

(a) Water vapour is present in air only during the monsoon.

Ans. False

(b) Water evaporates into air from oceans, rivers and lakes but not form the soil.

Ans. False

(c) The process of water changing into its vapour, is called evaporation.

Ans. True

(d) The evaporation of water takes place only in sunlight.

Ans. False

(e) Water vapour condenses to form tiny water droplets of water in the upper layers of air where it is cooler.

Ans. True

Q4. Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help? If yes, how?

Ans. Yes, spreading it near an anghiti or heater will surely help as heater and anghiti are source of heat which vaporize the water of the wet clothes and thus help in drying.

Q5. Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a puddle of water around it. Why?

Ans. The puddle of water seen around the cooled bottle of water is due to the condensation effect as the water vapours present in the air around the bottle get condensed after colliding with bottle.

Q6. To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet?

Ans. When we breathe out, water vapours also come out with exhaled air. These water vapours when come in contact with the glasses of spectacle make them wet.

Q7. How are clouds formed?

Ans. The process of condensation plays an important role in formation of cloud. As water vapour goes higher from the surface of the earth, it gets cooler. When the air moves up, it gets cooler and cooler. At sufficient heights the air becomes so cool that the water vapour present in it condenses to form tiny water droplets. It is these tiny droplets that remain floating in air and appear to us as clouds.

Q8. When does a drought occur?

Ans. If it does not rain for one or two years, the soil continuous to lose water by evaporation and transpiration. Since, it is not being brought back by rain, the soil becomes dry. The level of water in ponds and wells of the region goes down and some of them may even dry up. The ground water may also become scare. This may lead to drought.

Extra Questions for Class 6 Science Chapter 14 - Water.

- EXTRA QUESTIONS -

Here you get Some Extra questions regarding NCERT Class 6 Science Chapter 14 - Water. In which you get Definition of some terms talked about in NCERT Class 6 Science Chapter 14 - Water. You also get some short questions and long questions regarding NCERT Class 6 Science Chapter 14 - Water And Some Value Based Questions regarding NCERT Class 6 Science Chapter 14 - Water. If you prepare all these questions for your exams, then you will definitely get good marks in your upcoming examinations.

NOW let's see some Extra Questions for Class 6 Science Chapter 14 - Water.

# Define The Following Terms :

Flood : A flood is an overflow of water on land. Sometimes a river might receive extra water, either from heavy rains or other natural disasters.

Water cycle : The constant movement of water from the Earth to the atmosphere and back to the Earth through the process of evaporation, condensation and precipitation is known as the water cycle.

Underground water : When rainwater falls the water gets absorbed by the soil and is collected under the ground. This is called groundwater or underground water.

Extra Questions for Class 6 Science Chapter 14 - Water.

# Very Short Answer Type Questions :

Q. Mention any two uses of water

Ans.

a. It is used for drinking, cleaning, washing etc.

b. It is used for irrigation.

What will happen if we use too much of ground water ?

Ans. If we use too much of ground water the water table will decrease, which will lead to the scarcity of fresh water.

Give reason why plants are the important part of water cycle.

Ans. Plants are important part of water cycle because they releases water vapours in the atmosphere by the process of transpiration.

How do the areas covered with concrete affect the availability of ground water in that area?

Ans. Areas covered with concrete reduce the seepage of rainwater into the ground, thus reducing the availability of groundwater and as a result decrease in water table.

Why is water used as a coolant in the radiator of engines?

Ans. Water is used as a coolant in automobiles radiators because it absorbs a large amount of heat from the engine and keep it cool.

Why does sea water need to be treated before use?

Ans. Sea water is saline in nature, humans cannot drink saline water, that is why sea water is treated and can be made into freshwater. The process is called "desalination"

Water vapours get continuously added to atmosphere due to -

Ans. Evaporation and Transpiration

The process of conversion of vapours into liquid is known as :

Ans. Condensation

Falling of water drops is called

Ans. Precipitation.

If water during precipitation remains liquid till it reaches the surface of earth it called

Ans. Rainfall

Precipitation in frozen, form is called -

Ans. Snow fall

How much of the earth’s water is readily available as fresh water?

Ans. 3 %

Water that is safe for drinking is called -

Ans. potable water

The cyclic movement of water from the earth to the atmosphere and then back to the earth is called

Ans. Water Cycle

Flood water causes ?

Ans. Soil erosion

The reservoirs of underground water are called

Ans. Aquifers

The boiling point of water is :

Ans. 100° C

Removal of excessive salt from the sea water is called :

Ans. Desalination

Loss of water by evaporation from plants is called -

Ans. Transpiration

To give water to crops in a field is called -

Ans. Irrigation

A structure built on a river to store and hold back water is called -

Ans. Dam

What do you mean by potable water?

Answer:

The water which is suitable for drinking is called potable water.

Name two main processes which transfer water present on the earth into water vapour continuously.

Ans. Evaporation and transpiration.

What will happen if there is a continuous rain?

Ans. This results into floods.

Name some sources of water.

Ans. Hand pump, tube well, river, pond, lake, ocean, etc.

What is the ultimate source of water?

Ans. Rain.

Extra Questions for Class 6 Science Chapter 14 - Water.

# Short Answer Type Questions :

Write any three uses of water?

Ans.

(1) Water is used in homes for drinking, cooking food, washing utensils, cleaning floor, brushing teeth, bathing, washing clothes, flushing toilets and watering plants.

(2) Water is used in agriculture for growing crops.

(3) Water can be used as coolant in engines.

Why is there a need for conserving water?

Ans. To conserve water means to save water by using it carefully, wisely and by preventing its wastage. It is essential to conserve water because the amount of usable water on the earth is limited and there is scarcity of usable water for various purposes.

Can we use the water in the oceans and seas for drinking and other purposes? Why?

Answer:

No, we cannot use the water in the oceans and seas for drinking and other domestic agricultural and industrial needs because it has much salts dissolved in

What is the importance of water cycle?

Answer:

The water cycle is important for us because of the following reasons:

Water cycle helps in regulating weather on earth.

Water cycle makes water available in its various forms on the earth. The most important is the rainwater.

What are the different ways by which water vapour is put into the atmosphere?

Ans. Water in oceans, lakes and ponds get evaporated due to atmospheric heat. Factories and thermal power stations produce a lot of steam and put it into the atmosphere. Plants lose water through transpiration. Animals lose water through respiration, sweating and excretion. All this vapour accumulates in the atmosphere.

What are the factors affecting rate of evaporation?

Ans.

(a) Temperature: Higher is the temperature higher will be the rate of evaporation.

(b) Wind velocity: Higher is the wind velocity higher will be the rate of evaporation.

(d) Humidity: Humidity is the presence of moisture in air. Higher is the humidity, less will be the rate of evaporation.

How does water cycle help in maintaining global climate?

Ans. Water cycle plays an important role in the world climate. Ocean absorb vast quantities of heat and help in global warming. By absorbing heat, water evaporates and on condensation releases heat. This absorption and releasing of heat in the form of energy drives weather pattern in the short-term and regulate the climate for long time.

What is precipitation?

Ans. When water drops come together in the air, it becomes heavy and begin to fall. Falling of water drops is called precipitation.

Explain the roof-top rainwater harvesting.

Ans. In this technique, the rainwater from the roof-top is collected in a storage tank with the help of pipes. Here it is filtered and then sent into a pit. The water in the pit seeps or percolates slowly into the ground to recharge the groundwater.

What will happen if we keep a fish in a closed container without any aquatic plants? Give reason for your answer.

Ans. Fish in a closed container without any aquatic plant will die after some time. Aquatic plants, through the process of photosynthesis could supply oxygen to the fish, if this were present in the closed container along with the fish.

In what ways does water serves to sustain life?

Ans. Water controls various biological processes like, transpiration, ingestion, excretion, digestion, etc. Moreover 70% of our body weight comprises of water

What are the factors affecting rate of evaporation?

Answer:

(a) Temperature: Higher is the temperature higher will be the rate of evaporation.

(b) Wind velocity: Higher is the wind velocity higher will be the rate of evaporation.

(d) Humidity: Humidity is the presence of moisture in air. Higher is the humidity, less will be the the rate of evaporation.

How is rain useful to us?

Ans.

Rainwater is useful to us in the following ways:

Rains bring relief by cooling the environment after hot summer days.

The sowing of many crops depends on the arrival of rains during monsoon.

Rains provide water in the rivers and dams of hydroelectric power plants.

Rains fill the lakes and ponds which acts as source of water.

Rains are also responsible for recharging the groundwater and thus maintaining water table.

Why is water important for us?

Ans. Water regulates body temperature by the process of respiration and evaporation. All metabolic reactions in the body take place in a Question medium. It transports minerals and food materials in plant’s and animal’s body.

What are the different ways by which water vapour is put into the atmosphere?

Ans.

Water in oceans, lakes and ponds get evaporated due to atmospheric heat. Factories and thermal power stations produce a lot of steam and put it into the atmosphere. Plants lose water through transpiration. Animals lose water through respiration, sweating and excretion. All this vapour accumulates in the atmosphere.

How does rainwater become saline?

Ans.

Water is a universal solvent because it dissolves a large number of substances. When rain falls, it dissolves common salts and many other substances and minerals present on the earth. The rainwater passes through different layers of earth, rocks, dissolves large amount of salt and other minerals. Thus it becomes salty.

How does water cycle help in maintaining global climate?

Ans.

Water cycle plays an important role in the world climate. Ocean absorb vast quantities of heat and help in global warming. By absorbing heat, water evaporates and on condensation releases heat. This absorption and releasing of heat in the form of energy drives weather pattern in the short-term and regulate the climate for long time.

Extra Questions for Class 6 Science Chapter 14 - Water.

# Long Answer Type Questions :

What is water cycle? Explain the process of water cycle in nature with the help of suitable diagram.

Ans. Water constantly moves from the earth to the air and back again. The constant circulation of water is known as the water cycle. Water constantly moves from the earth to the air and back again. The constant circulation of water is known as the water cycle. The water in seas, rivers, lakes, ponds or streams evaporates because of the heat of the sun. Plants also give out large amounts of water from their leaves. The water vapour rises up. The air higher up in the atmosphere is cooler. This cools the water vapour and it condenses to form tiny drop of water. These drops of water together form clouds. As the clouds get cooled further, the water drops become bigger and heavier. When they become too heavy, they fall on the earth as rain and fill the sources of water like river, ponds, streams, etc.

What are the two different techniques of rain water harvesting? Explain.

Ans. Rainwater harvesting can be done in two ways:

# Rooftop rainwater harvesting : The roof acts as a catchment, collecting the rainwater that then flows through a series of pipes and filters before entering either a holding tank or going back via a small infiltration well into an underground bore well. This process of rooftop harvesting is simple, cost effective, and easy to maintain.

# Rainwater harvesting from open spaces around buildings or Surface runoff harvesting : Surface runoff rainwater harvesting is a method of collecting rainwater flowing along the ground during the rains will be collected to a tank below the surface of the ground for irrigation and other purposes.

What is drought? When does drought occur?

Ans.

Drought is a long period without rains leading to severe shortage of water in the region.

The soil continues to lose water by evaporation and transpiration. The water lost by soil is usually made up by rains. If, however, it does rain at all or the rainfall is very low for a long period, the loss of water from the soil is not made up and hence the soil becomes dry.

Due to lack of rains, the water level in the lakes and ponds also goes down and some of them may even dry up completely. In the absence of rains, no water seeps into the ground and hence the level of groundwater in wells, etc., falls drastically. Due to this groundwater also becomes scarce. In this way, a prolonged period of no rains or very low rains causes all around shortage of water leading to drought.

Mention the main processes that help in the circulation of water in nature.

Ans.

Main processes that help in circulation of water in nature are evaporation and condensation.

The process of conversion of water into its vapour is known as evaporation. Evaporation of water takes place continuously from oceans, rivers and other water bodies such as lakes and ponds. This water vapour becomes a part of the atmospheric, air.

The water vapour present in the air moves to different places along with the wind. When vapour reaches at a certain height, it gets cooled and turns into very tiny water droplets. These droplets become visible to us in the form of clouds. Ultimately, the water comes down to the surface in the form of rain or snow. This process of conversion of vapour into water is known as condensation.

Circulation of water by evaporation and condensation in this manner is known as water cycle.

What is precipitation? Does precipitation in atmosphere always result in rain?

Answer:

We think of rain or snow when clouds appear in the sky. But, many a times, it does not rain even though the sky may be covered with clouds. We now know that clouds carry small droplets of water in them. It may so happen that:

Many droplets of water come together to form larger sized drops of water. Such drops of water may become so heavy that they begin to fall. Falling of water drops is called precipitation. If the water during precipitation remains liquid till it reaches the surface of the earth, we have rains.

Sometimes precipitation may be in the form of hail or snow. Water in a hail or snow is in its frozen or solid form.

Many a times, especially during winter nights, the air near the surface becomes Questionuite cool. As a result, the water vapour present in it condenses to form water droplets. These water droplets appear as dew, which you might have observed on leaves or flowers in the morning during winters.

What is transpiration and write the factors affecting it?

Ans.

A part of water absorbed by the plants is released by plant through their leaves into the air by a process called transpiration.

Transpiration is affected by the following factors:

Temperature.

Humidity.

Windspeed.

What is water pollution and write its causes?

Ans.

The contamination of water due to human activities is known as water pollution. Causes of water pollution are:

Washing of clothes and utensils.

Disposal of household sewage and garbage.

Disposal of industrial effluent.

Bathing of animals.

What are the advantages of water harvesting?

Ans.

Advantages of water harvesting:

In areas where there is very low rainfall, water harvesting is the only way to reduce the water shortage.

There is an increase in the level of groundwater.

The effects of drought are lessened.

Places not situated near a river or large lakes have to rely on groundwater. Water harvesting is very important in such areas.

Water logging of low-lying roads and streets is prevented.

Soil and water pollution is reduced.

Extra Questions for Class 6 Science Chapter 14 - Water.

# Value Based Questions :

Question 1.

On a summer vacation, Ria went to her village to spent her holidays. After staying there for some days she realised the problem of shortage of water faced by the villagers. She along with her father went to the office of water supply department of her village and conveyed them the problem of water shortage.

The officer of water supply department assured Ria and her father that they will do something to overcome this shortage but the villagers must also adopt water conservation practices to use water judiciously. Ria thought to make villagers aware of water conservation practices with some interesting play so that they could understand its importance.

(a) Where did Ria went in her summer vacation?

(b) What did she observed there?

(c) What do mean by water conservation?

(d) What practices could help in conserving water?

(e) What values of Ria is shown here?

Answer:

(a) Ria went to her village in summer vacation.

(b) She observed water shortage there.

(c) Water conservation refers to strategies and activities made to manage fresh water as a sustainable resource to meet current and future human demand.

(d) (i) Use water judiciously.

(ii) Use water from washing machine, bathing and moping in watering plants or flushing toilets.

(iii) Check leaking pipes and get it repaired.

(iv) Use high-efficiency toilets that use less water in a flush.

(v) Water the plants at night to reduce loss of water due to evaporation.

(e) Ria is an intelligent, responsible, understanding, sensible and innovative girl.

Whenever Sajia returns from school she empties her water bottle in the potted plant instead of throwing it in the sink. She always keep her eyes on her housemaid that the water after mopping the house must be used for watering the plants in the garden.

(a) Can you suggest any other use of the water left after mopping?

(b) What is the function of water in plants?

(c) What values of Sajia is shown here?

Answer:

(a) We can use the water after mopping in flushing the toilets.

(b) Water in plants help in transportation, maintaining turgidity, photosynthesis and cooling through transpiration.

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