A free app for Android, by BOOKS N SOLUTIONS.
Class 9 NCERT Science Solution contains the complete solution of all the questions of the NCERT book of Class 9. The app is very helpful for the students of Class 9, as well as for students of other state boards, such as the CBSE Board and the Uttar Pradesh Board.
It is an offline application, so you don't have to connect to the Internet to use it. The app contains the following chapters:
Atoms and Molecules: The structure of the atom and the relationship between the atom and the molecule.
Natural Resources: The various forms of life are dependent on the availability of certain resources.
