Question

Which among the following is incorrect about Cyanobacteria?

(a) The word cyano means greenish-blue because of which cyanobacteria is also called as blue-green algae

(b) The colour of cyanobacteria is due to presence of chlorophyll

(c) Cyanobacteria are chemosynthetic autotrophs

(d) Cyanobacteria help in enriching oxygen levels in the atmosphere

I have been asked this question by my school teacher while I was bunking the class.

This key question is from Biological Classification in division Biological Classification of Biology – Class 11

Answer 1

The correct answer is (c) Cyanobacteria are chemosynthetic autotrophs

To explain: Cyanobacteria contain chlorophyll which helps to perform photosynthesis and in turn enrich the oxygen levels in the atmosphere. The word “cyano” in cyanobacteria means blue-green algae and therefore they are also called as blue-green algae.