GUWAHATI, Feb 28: Assam Jatiya Bidyalaya, Noonmati, Guwahati observed the tiol Science Day with a day-long programme at its school campus on Wednesday. To mark the discovery of Raman Effect by Nobel Laureate scientist CV Raman, Assam Jatiya Bidyalay also held a science exhibition along with a competition among the students from class-V to X on scientific experiment, science model and project.