Reasons which have contributed to changes in caste system were :(i) Efforts of political leaders and social reformers like Gandhiji, B.R. Ambedkar who advocated and worked to establish a society in which caste inequalities are absent.(ii) Socio-economic changes such as :1. Urbanisation2. Growth of literacy and education3. Occupational mobility4. Weakening of landlord's position in the village5. Breaking down of caste hierarchy(iii) The Constitution of India prohibited any caste-based discrimination and laid the foundations of policies to reverse the injustices of the caste system. (iv) Provision of fundamental right has played a major role because these rights are provided to all citizens without any discrimination.