Photosynthesis Question 8
8. Oxygenic photosynthesis occurs in: [2009]
(a) Oscillatoria
(b) Rhodospirillum
(c) Chlorobium
(d) Chromatium
Show Answer
Answer : a
Hints & Solution
(a) Oxygenic photosynthesis occurs in Oscillatoria. It is a genus of filamentous cyanobacteria which is named for the oscillation in its movement. Nitrogen fixation in marine Oscillatoria appears is associated with differentiated cells located in the center of the colony. The observations explain how Oscillatoria is able to fix $N_2$ without heterocysts in an aerobic environment and why it blooms virtually always occur in calm seas.
