Question

Oxygenic photosynthesis occurs in?

• A. Chromatium
• B. Chlorobium
• C. Rhodospirillium
• D. Oscillatoria

Answer 1

The correct option is D

Oscillatoria

The correct option is D:

Explanation for Correct option:

1. Oscillatoria requires photosynthesis to survive and proliferate.
2. Each oscillatoria filament is made up of trichomes, which are rows of cells.
3. Like a pendulum, the tip of the trichome oscillates.
4. Vegetative reproduction is the sole way to reproduce.

Explanation for Incorrect option:

Option A:

1. Chromatium okenii is a Gram-negative bacterium. It's a member of the Purple sulfur bacteria family.
2. These bacteria can photosynthesize but do not create oxygen because they use hydrogen sulfide (H2S) as an electron donor for CO₂ reduction.
3. Anoxygenic photosynthesis is the name for this form of photosynthesis.

Option B:

1. Chlorobium is a greensulfur bacteria genus.
2. They are photolithotrophic sulfur oxidizers that decrease NAD+ through a noncyclic electron transport chain.

Option C:

1. Rhodospirillum is a photosynthetic bacteria genus belonging to the Rhodospirillaceae family.
2. Their cells are spiral-shaped, polarly flagellated, and feature vesicular, lamellar photosynthetic membranes that are layered.

Final answer: Oxygenic photosynthesis occurs in Oscillatoria.