Q.
Assertion: Nostoc is a photosynthetic autotroph. Reason: Nostoc can fix atmospheric nitrogen in heterocysts.
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a
Both assertion and reason are true and reason is the correct explanation of assertion.
b
Both assertion and reason are true but reason is not the correct explanation of assertion.
c
Assertion is true but reason is false.
d
Both assertion and reason are false.
answer is B.
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Detailed Solution
Cyanobacteria have photosynthetic pigments like chlorophyll a and hence are photoautotrophs. They have heterocysts meant for nitrogen fixation.
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