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a
Nitrogen fixation in Rhizobium
b
Nitrogen fixation in Nostoc
c
Carbohydrate assimilation in Nostoc
d
Carbohydrate assimilation in Rhizobium
answer is B.
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Detailed Solution
Heterocysts are specialized cells that help in nitrogen fixation in members of cyanobacteria like Nostoc. Heterocyst is not involved in carbon assimilation as it lacks PSII