Specialized cells for fixing atmospheric nitr | vedclass

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(A) : Certain species of cyanobacteria $(Nostoc)$ possess some special cells called heterocysts which occur in terminal,basal,and intercalary position

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heterocysts

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(A) : Certain species of cyanobacteria $(Nostoc)$ possess some special cells called heterocysts which occur in terminal,basal,and intercalary positions.These heterocysts are yellowish in color and their contents are homogeneous.Heterocysts are now known as the primary sites of nitrogen fixation.Atmospheric nitrogen is converted into ammonia by these cells in cyanobacteria.

Specialized cells for fixing atmospheric nitrogen in $Nostoc$ are

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