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How many quanta of light are required to evolve one oxygen molecule in photosynthesis ? (Please explain) Three Eight Four Two

How many quanta of light are required to evolve one oxygen molecule in photosynthesis ? (Please explain)
 
  1. Three
  2. Eight
  3. Four
  4. Two

Grade:11

1 Answers

Arun
25763 Points
2 years ago
The theoretical minimum quantum requirement for photosynthesis is 8 photons for each molecule of oxygen evolved (four photons required by photosystem II and four by photosystem I). 

2 x 2 H2O -->4 H+ + O2 + 4 electrons. 

1 photon excites 1 electron in chlorophyll in PSI & PS II.

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