The incident occurred at Pachhauli village when the banyan tree in the government run school premises got uprooted and hit three students, BDO Mritunjay Kumar said.
A class X student Vidyanand Kumar (18) died on the spot, while Abhishek Kumar (11) and Chandan Kumar sustained injuries.
The deceased was a student of a high school located nearby, while the injured two were from the primary school, the BDO said.
Kumar said the body was sent for post-mortem and compensation would be given to the three as per norms.
