"The incident came to light when the girl's father lodged an FIR against the accused, Mono, who gives private tution from his home in Khurja," SP (Rural) Pankaj Pandey said.
The accused had allegedly raped the 16-year-old girl repeatedly for over a period of seven months promising to marry her.
"The girl is now six-month pregnant," Pandey said.
The accused has been booked under section 376 of IPC (rape) and further investigation in the case is on, police said.