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Question

Write the chemical reaction of photosynthesis and events occured during the process.

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Solution

The chemical reaction for representing the chemical reaction of photosynthesis is

6CO2+6H2O→C6H12O6+6O2

Sunlight energy

In photosynthesis reaction, energy is transferred from the light reaction step to dark reaction step by ATP. Photosynthesis is divided into two sets of reactions: the light-dependent (light) reactions and the light-independent (dark) reactions. As their names imply, the first set depends directly on light, whereas the second set does not. Nevertheless, even the dark reactions will cease if the plants are deprived of light for too long because they rely on the products of the light reactions. The light reactions, which convert the energy in light into chemical energy, take place within the thylakoid membranes of the chloroplasts, whereas the dark reactions, which use that chemical energy to fix CO2 into organic molecules, take place in the stroma of the chloroplast. In the light reactions, the energy of light is used to split water, stripping a pair of electrons from it (and causing the two hydrogens to be lost), thus generating molecular oxygen. The energy in light is transferred to these electrons and is then used to generate adenosine triphosphate (ATP) and the electron carrier NADPH. These two products carry the energy and electrons generated in the light reactions to the stroma, where they are used by the dark reactions to synthesise sugars from CO2.


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