Question

Q. The first step in photosynthesis is
A synthesis of ATP
(B) excitation of electron from chlorophyll-a
C photoionizatipn of water
D photophosphorylation.

Answer 1

Solution:
On receiving a photon of light energy, the photocentre P680 of photosystem ll excites an electron which is expelled from its orbital due to gain ofenergy (23 kcal/mole). It is the primary. reaction of photosynthesis which involves the conversion of light energy into chemical form. This phenomenon is called quantum conversion.

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