# NCERT Text book chapter 3 - [https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwj71-rIt8DsAhUoyzgGHX1aB5UQFjAAegQIAhAC&url=https%3A%2F%2Fncert.nic.in%2Fncerts%2Fl%2Fiesc103.pdf&usg=AOvVaw22O8YWbMOkIWZ1dwrPbRjq download] | # NCERT Text book chapter 3 - [https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwj71-rIt8DsAhUoyzgGHX1aB5UQFjAAegQIAhAC&url=https%3A%2F%2Fncert.nic.in%2Fncerts%2Fl%2Fiesc103.pdf&usg=AOvVaw22O8YWbMOkIWZ1dwrPbRjq download] |