Which of the following doesn’t supply Nitrogen?

Correct option is D

Trichoderma viride is a fungus that is not involved in nitrogen fixation. Rhizobium, Azotobacter, and Azospirillum are bacteria known for their ability to fix atmospheric nitrogen into a form usable by plants. In contrast, Trichoderma viride is commonly used as a biocontrol agent against plant pathogens but does not contribute to nitrogen supply.