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Which statements are true about heterocy...

Which statements are true about heterocyst? Br (a) Thick cell wall is permeable to oxygen , br (b) it lacks PS-II, br (c) PS-I remains active which generates ATP required to fix nitrogen.

A

All except (a)

B

All except (b)

C

All except (c)

D

All (a), (b) and (c)

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