Match the column I and column II.
Column IColumn IIA. Nitrobacter1. Free−living aerobic N2 fixerB. Clostridium2. Converts ammonia into nitriteC. Nitrosococcus3. Changes nitrite to nitrateD. Azotobacter4. Free−living anaerobic N2 fixer
ABCD3421
The correct matching is
1. Nitrobacter changes nitrite to nitrate.
2. Clostridium is free-living anaerobic N2-fixer.
3. Nitrosococcus converts NH3 to nitrite.
4. Azotobacter is free-living aerobic N2-fixer.