Question

Which one of the following plants can fix nitrogen from air?

• A. Pea
• B. Wheat
• C. Rice
• D. Maize

Answer 1

The correct option is A Pea

Nitrogen for plants is vital to the success of a garden. Without sufficient nitrogen, plants will fail and will be unable to grow. Nitrogen is abundant in the world, but most of the nitrogen in the world is a gas and most plant cannot use nitrogen as a gas. Most plants must rely on the addition of nitrogen to the soil in order to be able to use it. There are a few plants that love nitrogen gas, though; they are able to draw the nitrogen gas from the air and store it in their roots. These are called nitrogen fixing plants. Nitrogen fixing plants don’t pull nitrogen from the air on their own. They actually need help from a common bacteria called Rhizobium. The bacteria infects legume plants such as peas and beans and uses the plant to help it draw nitrogen from the air. The bacteria converts this nitrogen gas and then stores it in the roots of the plant. When the plant stores the nitrogen in the roots, it produces a lump on the root called a nitrogen nodule. It is harmless to the plant but beneficial during gardening.

So the correct option is 'pea'.