Oxygen is not produced during photosynthesis by
Cycas
Nostoc
Green sulphur bacteria
Chara
Since Chara and Cycas comes under plant kingdom so they perform oxygenic photosynthesis. Green sulphur bacteria utilises H2S instead of H2O and performs Anoxygenic Photosynthesis or do not evolve oxygen.
Option 1)
Cycas
This is incorrect.
Option 2)
Nostoc
This is incorrect.
Option 3)
Green sulphur bacteria
This is correct.
Option 4)
Chara
This is incorrect.