Which of the following is true for Cyanobacte | vedclass

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(A) Cyanobacteria are photosynthetic prokaryotes that perform oxygenic photosynthesis,meaning they release $O_2$ as a byproduct. Many species of cyano

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Oxygenic with nitrogenase

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(A) Cyanobacteria are photosynthetic prokaryotes that perform oxygenic photosynthesis,meaning they release $O_2$ as a byproduct. Many species of cyanobacteria are capable of nitrogen fixation,a process catalyzed by the enzyme nitrogenase. Nitrogenase is highly sensitive to oxygen and is inactivated by it. Therefore,to perform nitrogen fixation in an oxygenic environment,these organisms (like $Anabaena$ or $Nostoc$) develop specialized cells called heterocysts,which provide an anaerobic (oxygen-free) environment for the nitrogenase enzyme to function.

Column-$I$ (Bacteria)	Column-$II$ (Shape)
$A$. Coccus	$iii$. Spherical
$B$. Bacillus	$i$. Rod-shaped
$C$. Vibrio	$iv$. Comma-shaped
$D$. Spirillum	$ii$. Spiral

Which of the following is true for Cyanobacteria?

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Column-$I$ (Bacteria) Column-$II$ (Shape)
$A$. Coccus $iii$. Spherical
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