Which one of the following is not a biofertiliser?

Correct Option (d) Reason : Out of the following only Agrobacterium is not a biofertiliser. It is a Gram-negative bacterium that causes tumours in plants. It is well known for its ability to transfer DNA between itself and plants, and for this reason it has become an important tool for genetic engineering.

A tumefaciens causes crown-gall disease in plants. It has Ti-plasmid.