What are biofertilizers ? Name two organims which fix nitrogen asymbiotically and two organisms with fix symbiotically.

Solution

Biofertilizers are substances which contain micro-organisms that bring about soil nutrient enrichment by their biological activity.

Micro-organisms used are Bacteria, cyanobacteria and fungi.

Symbiotically nitrogen fixing organisms

1. Rhizobium leguminosarum.

2. Nostoc (Cyanobacteria).

Asymbiotically nitrogen fixing organisms

1. Free living aerobic bacteria—Azotobacter

2. Free living photosynthetic—Chlorobium.

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