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Q.

Which of the following atmospheric gases are utilized by $N_{2}$ fixing cyanobacteria like Nostoc ?

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a

$N_{2}, C O_{2}, O_{2}$

b

$N_{2}, O_{2} only$

c

${C O}_{2}, O_{2} only$

d

$N_{2} only$

answer is A.

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Detailed Solution

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Nostoc is oxygenic, aerobic photo-autotroph. Also Nostoc is a diazotroph and hence it can fix atmospheric nitrogen to form ammonia. During photosynthesis the vegetative cells will fix carbon dioxide to produce sugars and during respiration Nostoc will be utilizing oxygen and will be releasing CO₂.

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