Question

In what family of plants is nitrogen usually fixed ?

• A. Coniferous trees
• B. Sea Grass
• C. Legumes
• D. Deciduous Trees

Answer 1

The correct option is C Legumes

In the roots of legumes, there live many bacteria, who through their own metabolic processes are able to convert the nitrogen gas into ammonia or ammonium, depending on the acidity of the soil. Converting nitrogen gas into a more usable form is extremely difficult and is the reason that this process is so specialized. While ammonium may be usable by a few plants, the majority cannot use it and another process is required. Nitrifying bacteria oxidize the ammonia creating nitrite then nitrate allowing for the nitrogen to be assimilated into the plants.

So, the correct answer is 'Legumes'