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NCERT Class VI Science Solutions: Chapter 14 – 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.

Illustration: NCERT Class VI Science Solutions: Chapter 14 – Water Part 3

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:

  1. Increasing population need more water.
  2. 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.

Illustration: NCERT Class VI Science Solutions: Chapter 14 – Water Part 3

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 β‡Ύ Streams/Rivers β‡Ύ 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:

Illustration: NCERT Class VI Science Solutions: Chapter 14 – Water Part 3