Explanation: The SNDP movement was an example of a regional movement born out of conflict between the depressed classes and upper castes.

• It was started by Sree Narayana Guru Swamy (1856- 1928) among the Ezhavas of Kerala, who were a backward caste of toddy-tappers and were untouchables, denied education and entry into temples.
• The Ezhavas were the single largest caste group in Kerala constituting 26 per cent of the total population.
• Narayana Guru, himself from the Ezhava caste, took a stone from the Neyyar River and installed it as a Sivalinga at Aruvippuram on Sivaratri in 1888.
• It was intended to show that consecration of an idol was not the monopoly of the higher castes.
• With this he began a revolution that soon led to the removal of much discrimination in Kerala’s society.
• The movement (Aruvippuram movement) drew the famous poet Kumaran Asan as a disciple of Narayana Guru.

Source: Spectrum Modern India