Heterocysts are considered as a site of nitrogen fixation in nitrogen-fixing BGA as they possess

RuBISCO

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PEP carboxylase

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Nitrogenase

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Zymase

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Solution

The correct option is B Nitrogenase
Heterocysts are specialized nitrogen fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc punctitorme, Cylindrospermum stagnale and Anabaena sphaerica. They fix nitrogen from dinitrogen in the air using the enzyme nitrogenase, in order to provide the cells in the filament with nitrogen for biosynthesis.
So, the correct answer in 'Nitrogenase'.

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