Explanation:

The National Science Day (NSD) is observed every yearon 28th of February to mark the discovery of Raman effect by Physicist C V Ramanon 28th February, 1928. For his discovery, Sir CV Raman was awarded the Nobel Prize in Physics in 1930. In honour of this discovery and as a mark of tribute to the scientist, National Science Day was marked for the first time on February 28, 1987.This year, the theme for the 2019 NSD is, 'Science for the People and the People for Science'.