Ans: Chapter 16 of the book provides the significance of water for all living organisms. The chapter has been added to make students mindful of water protection. It begins with how much water is accessible on earth. Then, it discusses the water cycle and types of water after which it clarifies that groundwater is a significant wellspring of water so we should utilize it precisely. Further, the idea of consumption and subsequent management of water has been portrayed. The chapter additionally illuminates jobs that people can play to spare water and finally the impact that water shortage has on plants.