The Silent Valley Movement was started in 1973 in the state of:

Kerala

The correct answer is Option 2- Kerala

The Silent Valley Movement was started in 1973 in the state of Kerala.

The Silent Valley Movement was a social movement aimed at the protection of Silent Valley, an evergreen tropical forest in the Palakkad district of Kerala, India. It was started in 1973 to save the Silent Valley Reserve Forest from being flooded by a hydroelectric project.

The movement was successful in preventing the construction of the hydroelectric project. The Silent Valley was declared a national park in 1985.

The Silent Valley Movement is considered to be one of the most successful environmental movements in India. It is a reminder of the power of people to protect the environment.