Discussion
The specialised cell in which many filamentous cyanobacteria fix nitrogen is the
Answer: D
A heterocyst has a thickened wall and lacks the oxygen-producing photosystem, giving nitrogenase the anaerobic interior it requires. An akinete is a resting spore of the same organisms, an arbuscule belongs to mycorrhizas and a bacteroid is the fixing form of Rhizobium inside a nodule.
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