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NCERT Class VI Science Solutions: Chapter 14 β Water Part 3
SHORT ANSWER QUESTIONS
Question 14:
Why do wet clothes placed on a clothes line get dry after some time? Explain.
Answer:
Water present in wet clothes is converted into water vapour due to evaporation and leaves them dry.
Question 15:
Water kept in sunlight gets heat from sun and is evaporated. But how does water kept under the shade of a tree also gets evaporated? Explain.
Answer:
Air around us gets heated from sunlight. This warm air provides heat for evaporation of water kept in the shade.
Question 16:
How do the areas covered with concrete affect the availability of ground water?
Answer:
Areas covered with concrete reduce the seepage of rain water into the ground and this reduces the availability of ground water.
Question 17:
Why is there a need for conserving water? Give two reasons.
Answer:
- Increasing population need more water.
- Availability of water is decreasing day-by-day.
Question 18:
Fill in the blanks selecting words from the following list
snow, rain, clouds, vapour, evaporation, transpiration.
Water, as ________goes into atmosphere by the processes of________ and ________and forms ________, which on condensation fall in the form of ________ and ________.
Answer:
Water, as vapour goes into atmosphere by the processes of evaporation and transpiration and forms clouds, which on condensation fall in the form of snow and rain.
LONG ANSWER QUESTIONS
Question 19:
Most of the water that falls on the land as rain and snow, sooner or later goes back to a sea or an ocean. Explain how it happens?
Answer:
Hint: Snow/Rain βΎ Streams/Rivers βΎ Sea/Ocean.
Question 20:
Draw a diagram to show how sea water reaches a lake or pond.
Answer:
Hint: Draw diagram showing evaporation of water from sea, which form clouds in the sky. These clouds form rain. Rain water flows into lake or pond.
Question 21:
Dissolve two spoons of common salt in half a cup of water. Now if you want to get the salt back, what will you do?
Answer:
Hint: Water may be removed from the salt solution by heating it on a stove or keeping it in the sun in a plate for few hours.
Question 22:
Explain the process of rooftop rain water harvesting with the help of a suitable diagram.
Answer:
Hint: