Question

Nitrogen is not taken up by plants in _______ form.

• A. N2
• B. NO3–
• C. NO2–
• D. NH4

Answer 1

Answer:

A. N2

• N₂ is the form of nitrogen which exists in the atmospheric but is unavailable and is not useful for the plants.

• It has to be converted to other molecular forms by different nitrogen fixation processes in order to be accessible to plants.

• Plants mostly take up nitrogen in form of NO₃^–.

• Also, sometimes they absorb nitrogen in NO₂^– and NH₄⁺ forms.