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Question

Oxygenic photosynthesis occurs in?


A

Chromatium

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B

Chlorobium

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C

Rhodospirillium

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D

Oscillatoria

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Solution

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.


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