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B
Leaves
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C
Roots
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D
Flowers
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Solution
The correct option is C Leaves Anabaena, belongs to the genus of nitrogen-fixing blue green algae. It is made up of beadlike or barrel-like cells, there are interspersed enlarged spores (heterocysts) and are found in shallow water and on moist soil. While most of the nitrofgen fixing bacteria are found to be living symbiotically in root noodles of legumes. Anabaena is found living inside the ovoid cavities, inside the leaves of Azolla.