NCERT Solutions For Class 7 Science
NCERT Class 7 Science Chapter wise Solutions - Free PDF Download
1. What Does Chapter 16 of the NCERT Science Book Class 7 Signify?
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.
2. Explain the Different Properties of Air.
Ans: Following are the various properties of air:
It is a mixture of several gases such as nitrogen, oxygen, carbon dioxide, argon, helium, neon, etc.
Air constitutes a lot of atoms and molecules which give it mass.
Pressure is exerted by air conforming to its density at different altitudes and it also has weight.
It is generally without any odour and colour. It can be felt but not seen.
As it is a mixture of several gases, air also occupies space.
It also expands when under high temperatures and as it expands, it takes up more space and subsequently gets thinner.