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Besides paddy fields cyanobacteria are also found inside vegetative part of :
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- Cycas
- Equisetum
- Psilotum
- Pinus
Correct Option: A
In Cycas specialised root called coralloid roots are associated with N2 – fixing cyanobacteria either Nostoc or Anabaena. Coralloid roots lie near the soil surface. They are irregular and often dichotomously branched. Root hair and root cap are absent in these roots.