In an ecosystem, some plants may convert atmospheric nitrogen into ammonia through a process called A) transformation. B) denitrification. C) nitrogen fixation. D) nitrogenous mutation.

Answer: C). nitrogen fixation

The atmospheric nitrogen is converted into nitrogen compounds by nitrogen - fixing bacteria present in the soil. Plants absorb nitrogen compounds like nitrates and nitrites and water from soil. These nitrogen compounds are converted into ammonia which is necessary for protein synthesis in plants. This process of conversion of atmospheric nitrogen into ammonia by plants is known as nitrogen fixation.