open text book material class 9 science
or
download it from
http://mycbseguide.com/blog/
material-for-
open-text-based-
assessment
-otba-for-classes
-ix-and-xi-2013-14/
open text book material class 9 science
or
download it from
http://mycbseguide.com/blog/
material-for-
open-text-based-
assessment
-otba-for-classes
-ix-and-xi-2013-14/