Jagadisan, who worked with Monsanto for nearly two decades, including eight years as the managing director of India operations, spoke against the new variety during the public consultation held in Bangalore on Saturday.
On Monday, he elaborated by saying the company "used to fake scientific data" submitted to government regulatory agencies to get commercial approvals for its products in India.
The former Monsanto boss said government regulatory agencies with which the company used to deal with in the 1980s simply depended on data supplied by the company while giving approvals to herbicides.
"The Central Insecticide Board was supposed to give these approvals based on the location and crop-specific data from India. But it simply accepted foreign data supplied by Monsanto. They did not even have a test tube to validate the data and, at times, the data itself was faked," Jagadisan said.
"I retired from the company as I felt the management of Monsanto, USA, was exploiting our country," Jagadisan, 84, said from his home in Bangalore.
"At that time, Monsanto was getting into the seed business and I had information that a 'terminator gene' was to be incorporated in the seeds being supplied by the firm. This meant that the farmer had to buy fresh seeds from Monsanto at heavy cost every time he planted the crop," he said.