Explanation:

 Tiwa also known as Lalung is indigenous community inhabiting the states of Assam and Meghalaya and are also found in some parts of Arunachal Pradesh and Manipur.

=> They are divided into 2 sub-groups- Hill Tiwa and Plains Tiwa which have contrasting cultural features:

• Hill Tiwa: They live in the westernmost areas of Karbi Anglong district. They speak a Tibeto-Burman language. In most cases, the husband goes to live in her wife's family settlement (matrilocality), and their children are included in their mother's clan. One-half of them follow their traditional religion. It is based on the worship of local deities. The other half has been converted to Christianity since the 1950s.
• Plains Tiwa: They live on the flatlands of the Southern bank of the Brahmaputra valley. The vast majority speak Assamese as their mother tongue. Their descent system is patrilineal. Their religion shares many elements with Assamese Hinduism but remains specific.