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filamentous-cyanobacteria-differentiate-5-to-10-of-their-vegetative-cells-into-heterocysts-heterocysts-are

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)