Question

Legume plants are important for atmosphere, because they

• A. Help in NO${}_2$ fixation
• B. Do not help in NO${}_2$ fixation
• C. Increase soil fertility
• D. Help in N${}_2$ fixation

Answer 1

The correct option is D Help in N${}_2$ fixation

In the atmosphere, nitrogen is found as N${}_2$. This N${}_2$ is not usable by most plants and animals. In order for plants and humans to get the nitrogen they need, the nitrogen must be converted into ammonia NH${}_3$. The conversion of this atmospheric nitrogen to the usable form of ammonia is known as nitrogen fixation. Nitrogen fixation can be defined as the process of creating ammonia from atmospheric nitrogen. Most commonly, nitrogen fixation is carried out by bacteria. This nitrogen-fixing bacteria is most commonly found near the roots of legumes.

So, the correct answer is option D.