Explore “Water BOSEM Class 6 Science Solutions”, covering essential concepts such as the water cycle, condensation, evaporation, the importance of water, water conservation, rainwater harvesting, and factors affecting water availability. Perfect for exam preparation with extra questions and answers.
About the Chapter: This chapter introduces students to the significance of water in our daily lives, its sources, and natural processes like the water cycle, evaporation, and condensation. It covers essential topics such as water scarcity, the importance of water conservation, rainwater harvesting techniques, and the effects of pollution on water bodies. The chapter emphasizes understanding water’s role in nature and the need for sustainable practices
Water BOSEM Class 6 Science Solutions
Find clear, concise solutions for Class 6 Science Chapter Water, covering key concepts like the water cycle, evaporation, condensation, and water conservation. Perfect for exam prep and quick revision.
Textbook Exercises
1. Fill up the following blanks
a. The process of changing 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 rain may cause flood.
2. 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 morning.
Ans: Condensation
(d) The blackboard dries up after wiping it.
Ans: Evaporation
(e) Steam rising from a hot griddle when water is sprinkled on it.
Ans: Evaporation
3. Which of the following statements are true?
(a) Water vapour is present in the air only during the monsoon.
Ans: False
(b) Water evaporates into the air from oceans, rivers, and lakes but not from 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 droplets of water in the upper layers of air where it is cooler.
Ans: True
4. Suppose you want to dry your school uniform quickly. Would spread it near an anghiti or heater help? If yes, how?
Ans: Yes, spreading the school uniform near an anghiti or heater will help because heating increases the rate of evaporation, allowing the uniform to dry faster.
5. Take out a cooled bottle of water from the refrigerator and keep it on a table. After some time, you notice droplets of water around it. Why?
Ans: Because the cold surface of the cooled bottle cools the air around it, and the water vapour in the air condenses on the surface of the cooled bottle.
6. To clean their spectacles, people often breathe on glasses to make them wet. Explain why the glasses become wet.
Ans: When we breathe out, we exhale carbon dioxide gas along with water vapour. The water vapour, when it comes in contact with the surface of the glass, condenses, making the glass wet and easier to clean.
7. How are clouds formed?
Ans: The process of condensation plays an important role in bringing water back to the surface of the earth. As we go higher from the surface of the earth, the air gets cooler. At sufficient heights, the air becomes so cool that the water vapour present in it condenses to form tiny droplets that remain floating in the air and appear to us as clouds.
8. When does a drought occur?
Ans: If it does not rain in a region for a year or more, water is lost from the soil due to evaporation and transpiration. This leads to a decrease in the level of water in ponds, lakes, wells, etc. Some of them even dry up. The groundwater becomes scarce, leading to drought.
EXTRA QUESTIONS AND ANSWERS:
Q1. Name some sources of water.
Ans: Seas, oceans, rivers, wells, etc.
Q2. Water in the oceans and seas is not fit for drinking or other purposes. Why?
Ans: Water in the oceans and seas is not fit for drinking and other purposes because the water in oceans and seas is salty, i.e., it is saline.
Q3. Define the following:
(a) Water cycle
(b) Evaporation
(c) Condensation
Ans:
(a) Water from the ocean and surface of the earth goes into the air as vapour, returns as rain, hail, or snow, and finally goes back to the oceans. The circulation of water in this manner is known as the water cycle.
(b) Evaporation is the process of converting water into its vapour state.
(c) The process of converting water vapour into its liquid form is called condensation.
Q4. Name the processes by which water is continuously added to the atmosphere.
Ans: Evaporation and transpiration.
Q5. What is transpiration?
Ans: The process of loss of water in the form of water vapour from the leaves of plants is called transpiration.
Q6. What are the consequences of floods?
Ans: Floods cause extensive damage to crops, domestic animals, property, and human life.
Q7. Write the two techniques of rainwater harvesting.
Ans:
(a) Rooftop rainwater harvesting: In this system, rainwater is collected from the rooftop to a storage tank through pipes.
(b) To allow water to go into the ground directly from roadside drains that collect rainwater.
Q8. What are the factors leading to a shortage of water?
Ans: The factors leading to a shortage of water are:
(a) Increasing population.
(b) More and more water is being used for producing food and by industries.
Q9. Give reasons why:
(a) Dew forms on leaves of grass in winter morning.
(b) Water spilled on a floor dries up after some time.
Ans:
(a) It is due to condensation.
(b) It is due to evaporation.
Q10. Name the process responsible for the formation of hail and snow.
Ans: Precipitation.
Additional Extra Questions and Answers:
Q1. Why is water important for all living beings?
Ans: Water is essential for all living beings because it is needed for basic activities such as drinking, cooking, cleaning, and, in the case of plants, photosynthesis.
Q2. What is groundwater, and how is it used?
Ans: Groundwater is water that collects underground in the cracks and spaces in soil, sand, and rock. It is often extracted using wells and is used for drinking, irrigation, and other daily activities.
Q3. How does pollution affect water bodies?
Ans: Pollution affects water bodies by contaminating the water with harmful chemicals, waste, and toxins, making it unsafe for drinking and damaging aquatic life.
Q4. What is the difference between evaporation and boiling?
Ans: Evaporation is a slow process that occurs at the surface of a liquid at any temperature, while boiling is a rapid process that happens throughout the liquid at a specific temperature (boiling point).
Q5. How can we conserve water at home?
Ans: Water can be conserved at home by using buckets instead of hoses for washing cars, fixing leaking taps, using water-efficient appliances, and avoiding unnecessary wastage.
Q6. Why do coastal areas have a humid climate?
Ans: Coastal areas have a humid climate because of the high level of moisture in the air due to the nearby water bodies, where constant evaporation adds water vapour to the air.
Q7. What is infiltration?
Ans: Infiltration is the process by which water on the ground surface enters the soil. It helps replenish groundwater.
Q8. How does deforestation affect the water cycle?
Ans: Deforestation reduces transpiration, which can decrease rainfall in the area, disrupt the water cycle, and lead to a decrease in groundwater levels.
Q9. Why is rainwater harvesting important?
Ans: Rainwater harvesting is important because it helps conserve water, reduces dependency on groundwater, and provides a water source during dry periods, especially in areas with limited water supply.
Q10. What is a water table?
Ans: The water table is the level below which the ground is saturated with water. It marks the boundary between groundwater and the unsaturated soil above.
