Question

2. What is the function of the bacteria shown in the model?

A They prevent the nitrogen from harming the plants.
B They remove the nitrogen from the soil.
C They remove the oxygen from the soil.
D They return the nitrogen to the system.

Answer 1

The bacteria shown in the model are most likely nitrogen-fixing bacteria. These bacteria have the ability to convert atmospheric nitrogen into a form that plants can use, such as ammonia or nitrates. Therefore, the function of these bacteria is to return the nitrogen to the system, making it available to plants. The correct answer is D.