Question

First photosynthetic organisms to appear on earth were:

• A. Bacteria
• B. Green algae
• C. Cyanobacteria
• D. Bryophytes

Answer 1

Answer: (C)

Cyanobacteria

C. Cyanobacteria

Solution : Cyanobacteria or blue green algae were the first organisms that appeared on earth and underwent anoxygenic photosynthesis and gave out oxygen and made the earth oxygenic in a few million years.

So the correct answer is "Cyanobacteria".