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S-I- Chl a absent in heterocyst S-II- Nitrogenase present in h
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S-I- Chl a absent in heterocyst
S-II- Nitrogenase present in heterocysts

A
Only I correct

B
Only II correct

C
Both I and II correct

D
Both I and II wrong

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S-II- Nitrogenase present in heterocysts
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Text SolutionText solutionverified iconVerified

Chlorophyll – a is absent in photosynthetic bacteria.
Heterocysts or heterocytes are specialized nitrogen-fixing cells formed during nitrogen starvation by some filamentous cyanobacteria.
Nitrogenase is inactivated by oxygen, so the heterocyst must create a micro anaerobic environment.
Cyanobacteria are oxygenic photoautotrophs and nitrogen fixers. Thus, they release oxygen during photosynthesis and also contain nitrogenase enzymes.
Therefore, the correct option is C.
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Question Text
S-I- Chl a absent in heterocyst
S-II- Nitrogenase present in heterocysts
TopicBiological Classification
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes127