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Besides paddy fields cyanobacteria are also found inside vegetative part of:

1. Cycas
2. Equisetum
3. Psilotum
4. Pinus

Correct answer: Cycas

Solution

Cycas is known to harbor cyanobacteria in its coralloid roots and also in vegetative parts like the leaf base. This symbiosis helps with nitrogen fixation, unlike the other listed plants.

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