Question

Which one among the following type of bio-fertilizer does not fix nitrogen ?
1. Azotobacter
2. Trichoderma viride
3. Rhizobium
4. Acetobacter
5. Azospirillum

Answer 1

Correct Answer - Option 2 : Trichoderma viride

The correct answer is Trichoderma viride.

• Trichoderma viride is a fungus and a bio-fungicide.

• It is used for seed and soil treatment for suppression of various diseases caused by fungal pathogens.

• It is found naturally in soil and is effective as a seed dressing in the control of seed and soil-borne diseases including Rhizoctonia solani, Macrophomina phaseolina and Fusarium species.

 

• Nitrogen fixers:

Free living	Aerobic: AzotobacterAnabaena, Beijerinckia. Anaerobic: Clostridium  Faultative anaerobic: Klebsiella.
Symbiotic	Rhizobium, Frankia, Anabaena azollae
Associative symbiotic	Azospirillum
Endophytic	Gluconacetobacter Burkholdra