alleryNitrogen is fixed in cyanobacteria inside specialised cells called:
AHeterospores
BHeterogametes
CHeterocysts
DHeterotrophs
Answer & Solution
Correct answer: C. Heterocysts
1. Nostoc and Anabaena can fix atmospheric nitrogen.
2. They do it in a special thick walled cell.
3. That cell is the heterocyst.
_Source: syllabus Biology, Ch 2 'Biological Classification'_
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