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Biology CBSE Live product
Class 9 (2025-26)
Improvement in food resources
PTA Revision
1.
Biofertilizer
Question:
1
m.
Choose the best option:
Why is Rhizobium a biofertilizer but Urea is not?
Both fix nitrogen
Rhizobium fixes nitrogen naturally
Urea has living microbes
Rhizobium removes nitrogen
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