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PGA as the first $CO_2$ fixation product was discovered in photosynthesis of
A
Alga
B
Bryophyte
C
Gymnosperm
D
Angiosperm
Detailed Solution
Melvin Calvin and his co-workers used radioactive $^{14}C$ in studies of algal photosynthesis.
Working with the unicellular green algae $Chlorella$ and $Scenedesmus$, they found that the first stable product of $CO_2$ fixation was a 3-carbon organic acid, 3-phosphoglyceric acid (PGA).
This led to the working out of the complete biosynthetic pathway, the Calvin cycle ($C_3$ pathway).
Hence PGA as the first $CO_2$ fixation product was discovered in an alga.
Working with the unicellular green algae $Chlorella$ and $Scenedesmus$, they found that the first stable product of $CO_2$ fixation was a 3-carbon organic acid, 3-phosphoglyceric acid (PGA).
This led to the working out of the complete biosynthetic pathway, the Calvin cycle ($C_3$ pathway).
Hence PGA as the first $CO_2$ fixation product was discovered in an alga.