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From which process does the O2 produced in photosynthesis arise? Photolysis RUBP regeneration Carbon fixation Chemiosmosis

From which process does the O2 produced in photosynthesis arise?

Photolysis

RUBP regeneration

Carbon fixation

Chemiosmosis

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Answer #1

Option (a) photolysis is correct answer.

Photolysis -
• This is lysis of water molecule nin presence of light energy during light reaction of photosynthesis.
• Chlorophyll absorbs light energy and use it for photolysis.
• Hydrogen ions or protons and oxygen is produced by photolysis. Oxygen is released and protons are used in chemiosmosis.

Other options -
RUBP regeneration :-
This is step of calvin cycle. RUBP is used for carbon fixation. This regeneration step requires energy in form of ATP.

Carbon fixation -
This is first step of calvin cycle. RUBP binds to carbon dioxide in presence of rubisco enzyme and two molecules of phosphoglycerate are formed.

Chemiosmosis -
In this step of light reaction, protons move from high concentration to low concentration through ATP synthase and ATP is formed.

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