Prime Minister Manmohan Singh has stepped in to make it clear that Environment Minister Jairam Ramesh will not have the last word on the introduction of Bt Brinjal or any GM (genetically modified) food.This comes after a strong note from Union Agriculture Minister Sharad Pawar to the Prime Minister last week suggesting that ad hoc decisions on GM foods — a clear reference to the moratorium on Bt Brinjal — would ”set the clock back”, demoralise Indian scientists and jeopardies R&D crucial to food security.