MCQ
Nitrogen fixation in root nodules of Alnus is brought about by:
- ✓Frankia.
- BAzospirillum.
- CNostoc.
- DRhizobium.
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$I$. Maintaining the ecological process.
$II$. To enrich the wild life diversity with exotic species.
$III$. Preventing migration of species.
$IV$. Maintaining the diversity of life.
The correct statement are