Question

Which one of the following microbes forms symbiotic association with plants and helps in their nutrition?

• A. Glomus
• B. Trichoderma
• C. Azotobacter
• D. Aspergillus

Answer 1

The correct option is A

Glomus

Of the given options, Glomus is the only microorganism that forms a symbiotic association with plants and helps in their nutrition.
Trichoderma harzianum is a fungus that is also used as a fungicide. It is used for foliar application, seed treatment and soil treatment for suppression of various disease-causing fungal pathogens.
Azotobacter is a free-living nitrogen-fixing bacterium, which is used as a biofertilizer in the cultivation of most crops.
Aspergillus is a type of mold (a type of fungus) that causes aspergillosis.