Moderate
The available form of nitrogen for plants is_________________?
Correct answer: C. Both a and b
- A. NO3
- B. NH4
- C. Both a and b
- D. non of these
Explanation
Plants can absorb nitrogen mainly as nitrate (NO3−) and ammonium (NH4+), so both forms are available to roots. Other nitrogen forms generally need conversion before plant uptake.
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