First slide

What is Light Reaction?

Question

For evolution of one molecule of oxygen, how many light quanta are required ?

Difficult

A

Four
B

Eight
C

Six
D

Twelve

Solution

Quantum requirement is the number of light Quanta or photons required for the evolution of 1 mol. of O₂in photosynthesis. Emerson calculated that the quantum requirement is 8.

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