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Nitrogen fixation occurs in
Option: 1
Akinetes of Chlorophyceae
Option: 2
Heterocysts of Cyanobacteria
Option: 3
Akinetes of Rhodophyceae
Option: 4
All of these
Answers (1)
- Cyanobacteria possess heterocysts which are thick-walled cells that are found in terminal, intercalary or lateral positions. It is involved in nitrogen fixation.
- The thick wall of the heterocyst is impermeable to oxygen but permeable to nitrogen.
- Examples: Spirulina ( highly proteinaceous superfood ), Nostoc, Oscillatoria, Anabaena and Rivularia etc.
- Hence, option 2 is the correct answer.
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