Question

Favourable condition for nitrogenase activity in heterocyst of BGA is due to

• A. Loss of PS-II
• B. Loss of PS-I
• C. Presence of thick wall
• D. More than one option is correct

Answer 1

The correct option is A Loss of PS-II

Heterocysts are specialized nitrogen-fixing cells formed during nitrogen starvation by some blue-green algae. They fix nitrogen from di-nitrogen in the air using the enzyme nitrogenase and nitrogenase is inactivated by oxygen, so the heterocyst must create a micro-anaerobic environment and that's why heterocysts degrade photo-system II, which produces oxygen.

So, the correct option is 'Loss of PS-II'.