Which of the following statements about ...

Which of the following statements about cyanobacteria is incorrect ?

A

Cyanobacteria like Nostoc and Anabaena are chemosynthetic autotrophs.

B

Cyanobacterial colonies are generally surrounded by a gelatinous sheath.

C

They are unicellular, filamentous and terrestrial/marine organisms.

D

Some of these organisms can fix nitrogen in specialized cells called heterocysts.

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The correct Answer is:

A

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