Question

Conversion of $N{O}_3\to N{O}_2\to N{H}_3$ is called _______ and is catalysed by ________

• A. Nitrate assimilation, nitrate and nitrite reductase
• B. Nitrification, nitrate and nitrite reductase
• C. Ammonification, glutamate dehydrogenase
• D. Denitrification, transaminase

Answer 1

The correct option is A Nitrate assimilation, nitrate and nitrite reductase

Nitrogen assimilation is the formation of organic nitrogen compounds like amino acids from inorganic nitrogen compounds. It occurs in the followig steps:

• Nitrate is transported into cells and is converted by nitrate reductase present in the cytosol into nitrite.
• Nitrite is then transported into chloroplasts (in case of plants), where it is converted by nitrite reductase into ammonia.

So, the correct answer is " Nitrate assimilation, nitrate, and nitrite reductase ".