Question

Plants take nitrogen from the soil by absorption through their roots as

• A. Nitrate ions
• B. Nitrite ions
• C. Ammonium ions
• D. All of the above

Answer 1

Answer: (A), (C)

Nitrate ions
Ammonium ions

Plants take nitrogen from the soil by absorption through their roots as nitrate ions and ammonium ions.Nitrite is intermediate and gets converted to either forms by symbiotic or non-symbiotic bacteria present in plant roots and soil respectively. Most nitrogen obtained by terrestrial animals can be traced back to the eating of plants at some stage of the food chain.

So, the correct answer is 'nitrate ions' and 'ammonium ions'