Census data on the tribal population in Arunachal Pradesh is important for:

The correct answer is: d) All of the above

Census data on the tribal population in Arunachal Pradesh is important for understanding cultural diversity, designing targeted welfare schemes, and protecting tribal rights and land.

• Understanding cultural diversity: Census data can help us to understand the different cultures and languages of the tribal population in Arunachal Pradesh. This information can be used to develop policies and programs that promote cultural diversity and inclusion.
• Designing targeted welfare schemes: Census data can help us to identify the specific needs of the tribal population in Arunachal Pradesh. This information can be used to design targeted welfare schemes that are more likely to be effective in meeting those needs.
• Protecting tribal rights and land: Census data can help us to identify the areas where tribal people live and the land that they own. This information can be used to protect tribal rights and land from encroachment and development.

In addition, census data can also be used to track the progress of development in tribal areas, to identify areas where there are disparities in access to education, healthcare, and other services, and to develop policies and programs to address those disparities.