Which of the following is not true for the he | vedclass

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(D) Heterocysts are specialized,thick-walled cells found in some filamentous cyanobacteria like $Nostoc$. $1$. They are typically found in an intercal

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$CO_2$ fixation ability

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(D) Heterocysts are specialized,thick-walled cells found in some filamentous cyanobacteria like $Nostoc$. $1$. They are typically found in an intercalary or terminal position. $2$. They are the primary sites of nitrogen fixation because they provide an anaerobic environment for the enzyme nitrogenase. $3$. They contain polar nodules,which are plug-like structures at the poles that regulate intercellular communication. $4$. Heterocysts lack Photosystem $II$ $(PS-II)$,which is required for the photolysis of water and the evolution of oxygen. Since $CO_2$ fixation (Calvin cycle) requires $ATP$ and $NADPH$ (produced by light reactions),and the lack of $PS-II$ prevents the production of $NADPH$ via non-cyclic photophosphorylation,heterocysts are unable to perform $CO_2$ fixation. Therefore,the statement that heterocysts have $CO_2$ fixation ability is incorrect.

Which of the following is not true for the heterocyst of $Nostoc$?

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