Question

What is the primary reaction of photosynthesis ?

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Answer 1

Answer:

primary reaction or light reaction which occurs in the grana of chloroplast.

in this reaction NADPH and ATP is synthesised.

This reaction is light dependent.

It means light energy drives this physio chemical process to the completion.

Answer 2

ANSWER

Excitation of chlorophyll molecules

SOLUTION

During the first stage of photosynthesis, called the light-dependent reaction, sunlight excites the electrons in the chlorophyll pigment. The organism uses this energy to create the energy carrier molecules ATP and NADPH, which are crucial for carbon fixing during the second stage.

Water splits to form  H²+and O2

The photolysis of water occurs during light reaction. The site for occurrence of photolysis is thylakoid lumen. The photolysis of water releases protons, which accumulate in the lumen and contribute to the electrochemical gradient of protons. The electrons released are used up to fill the electron hole in the reaction centre of PSII and oxygen molecule is released as by product of photosynthesis. The electrons released during photolysis of water are ultimately used to synthesize the reducing power for reducing carbon dioxide later on. The mineral ions required for photolysis of water are calcium, manganese and chlorine.