Filamentous Cyanobacteria differentiate 5 to 10% of their vegetative cells into heterocysts. Heterocysts are characterized by :

(I) Thick cell wall

(II) Only PSI activity

(III) Nitrogenase activity

[A] (I) only

[B] (I) and (II) only

[C] (II) and (III) only

[D] (I), (II) and (III)

Answer & Explanation
Answer: (I), (II) and (III)

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