Q.

What is in incorrect for Nostoc ?

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a

Heterocystous cyanobacteria .

b

Presence of mucilaginous sheath.

c

Anoxygenic photosynthesis.

d

Mostly they have presence of flagella.

answer is C.

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Detailed Solution

Cyanobacteria lack flagella. Photosynthesis in cyanobacteria is oxygenic. The colonies are generally surrounded by gelatinous sheath. Some of these organisms can fix atmospheric nitrogen in specialised cells called heterocysts, e.g., Nostoc and Anabaena.
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