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NCERT Solutions for Class 7 Science Chapter 16: Water- A Precious Resource

iacst-2022

Water is an important and essential resource on planet Earth. This chapter discusses the various forms in which water is present in the atmosphere, the water cycle, and how overexploitation of the resource can lead the world towards an inevitable crisis. The following are the points discussed in the chapter:

  • Water is essential for all living beings.
  • Water exists in three forms: solid, liquid and vapour.
  • There is an uneven distribution of water. Much of it has resulted from human activities.
  • Drip irrigation is a technique of watering plants by using narrow tubing that delivers water directly at the base of the plant. Groundwater can be extracted using water wells.
  • Rainwater can be used to recharge the groundwater. This is referred to as water harvesting.
  • An aquifer is an underground layer of water-bearing permeable rock, rock fracture or unconsolidated materials.
  • Unnecessary use of water and overdrawing from groundwater leads to depletion of the water table. Recharge of water to the ground should be increased.

 

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Also See
Chapter 1 Nutrition in Plants Chapter 2 Nutrition in Animals Chapter 3 Fiber to Fabric
Chapter 4 Heat Chapter 5 Acids, Bases and Salts Chapter 6 Physical and Chemical Changes
Chapter 7 Weather, Climate and Adaptations of Animals to Climate Chapter 8 Winds, Storms and Cyclones Chapter 9 Soil
Chapter 10 Respiration in Organisms Chapter 11 Transportation in Animals and Plants Chapter 12 Reproduction in Plants
Chapter 13 Motion and Time Chapter 14 Electric Current and its Effects Chapter 15 Light
Chapter 17 Forests: Our Lifeline Chapter 18 Wastewater Story

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