Home Biology Biological Classification Previous Year Questions Which of the following is incorrect about Cy…
Biology Biological Classification Previous Year Questions Single Correct MCQ
Published on: August 21, 2026

Which of the following is incorrect about Cyanobacteria?

A
They lack heterocysts
B
They often form blooms in polluted water bodies
C
They have chlorophyll 'a ' similar to green plants
D
They are photoautotrophs

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The correct answer is:
A

Cyanobacteria (also referred to as blue-green algae) have chlorophyll a similar to green plants and are photosynthetic autotrophs. Some of these organisms can fix atmospheric nitrogen in specialised cells called heterocysts, e.g., Nostoc and Anabaena

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