Question

Which of the following is the benefit of blue-green algae?

• A. They increase the soil pH.
• B. They increase the nitrogen content
• C. They help in the growth of weeds.
• D. They help in the growth of pests or insects.

Answer 1

The correct option is B They increase the nitrogen content

The organisms like blue-green algae and bacteria are extensively used to fix nitrogen in the soil for agriculture. This will improve the fertility of the soil.