Explanation:

Amritlal Vithaldas Thakkar, popularly known as Thakkar Bapa was born at Bhavnagar, Gujarat. He was an Indian social worker who worked for upliftment of tribal people in Gujarat state in India. He became a member of the Servants of India Society founded by Gopal Krishna Gokhale in 1914.

In 1922, he founded the Bhil Seva Mandal Later, he became the general secretary of the Harijan Sevak Sangh founded by Mahatma Gandhi in 1932 .

The Bharatiya Adimjati Sevak Sangh was founded on the 24 October 1948 on his initiative. When Indian constitution was in process, Thakkarbapa visited remotest and most difficult parts of India and conducted probe into the situation of tribal and Harijan people. He added valuable inputs in the process of constitution. Mahatma Gandhi would call him ‘Bapa’. Thakkarbapa visited forests in Assam, rural Bengal, drought affected areas of Orissa, Bhil belts in Gujarat and Harijan areas of Saurashtra, Mahar areas of Maharashtra, untouchables in Madras, hilly areas of Chhota Nagpur, desert of Tharparkar, foothills of Himalaya, coastal areas of Travankor with his mission of upliftment of tribal and harijans. He would always travel in third class of railway. Thakkarbapa spent 35 years of his life in service of tribal and harijans.