DENDROLOGY

Detailed explanation-1: -In 1770, the Kalangs resisted by attacking a Dutch fort at Joana, but their revolt was brutally suppressed.

Detailed explanation-2: -When the Mataram Kingdom to Java split the families of the Kalang community were divided equally between the two kingdoms. When the Dutch colonised Java they forced the Kalangs to work under them. The Kalangs reacted by attacking the Dutch fort are Joana.

Detailed explanation-3: -Answer: Kalangs of Java were skillful foresters and shifting cultivators. They were important as their guidance was necessary for betterment of the forest sectors. The Kalangs first rose in rebellion against Dutch when they were forced to work under the Dutch.