Question

Cyanobacteria helps farmers by

• A. Reducing the alkanity of the soil
• B. Reducing the acidity of the soil
• C. Neutralising the alkanity of the soil
• D. Water logging

Answer 1

The correct option is B Reducing the acidity of the soil

• Cyanobacteria fix atmospheric nitrogen to nitrogen oxides (nitrates and nitrites). The oxides reduce the acidity of the soil.
• Too much acidity can cause plants to die thus cyanobacteria helps the growth of plants by reducing the acidity of the soil.
• Hence Cyanobacteria helps farmers by reducing the acidity of the soil.
• So, the correct answer is 'reducing the acidity of the soil'.