Question

Which of the following increase the fertility of soil ?​
A. Lactobacillus bacteria​
B. Rhizobium bacteria ​
C. Spirogyra algae ​
D. Blue-green algae​

• A. A and D
• B. B and D
• C. A and B
• D. B and C

Answer 1

The correct option is B B and D

• Correct option: (d) B and D.​
• Atmospheric nitrogen cannot be used directly by plants.​
• Bacteria like Rhizobium present in the root nodules of leguminous plants helps in the nitrogen fixation.​
• Certain bacteria like blue-green algae present in the soil, fix nitrogen from the atmosphere and convert it into usable compounds of nitrogen.​