Oxygen is not produced during photosynthesis by

Options

A. Cycas
B. Nostoc
C. Green sulphur bacteria
D. Chara

Answer

C

Explanation

Green sulphur bacteria are anaerobic bacteria. They do not evolve oxygen during photosynthesis. Such type of photosynthosis is known as anoxygenic photosynthesis. They do not use water as a source of reducing power. Instead, hydrogen is obtained from hydrogon sulphide.
`underset("Hydrogen sulphide")(H_(2)S)to2[H]+S`
`6CO_(2)+12H_(2)underset("Enzymes")overset("Light")toC_(6)H_(12)O_(6)+6H_(2)O`
Concept Enhancer Green sulphur bacteria, e.g. Chlorobium limicola, possesses bacteriophaeophytin as photosynthetic pigment.
Cycas is a gymnosperm, Nostoc is a blue-green algae arnd Chara is a green algae. All of these produce oxygen during photosynthesis.