Which of the following is true for photosynthesis?

Concept:

Oxidation reaction:

• Oxidation Reaction refers to a reaction in which either the addition of Oxygen takes place or the removal of Hydrogen takes place.
• It can also be said as the process of loss of one or more electrons by atoms or ions.
• Eg - H₂O gets oxidised to release O₂ {Removal of hydrogen}

Reduction Reaction:

• Reduction Reaction refers to a reaction in which either the addition of Hydrogen takes place or the removal of oxygen takes place.
• In the process of reduction, a chemical species also gains electrons.
• It is the reverse of the oxidation reaction.
• Eg - CO₂ gets reduced to form C₆H₁₂O₆ {addition of hydrogen}

Explanation:

• Plants prepare their food by the process called photosynthesis. 
• During photosynthesis, plants trap solar energy or light energy with the help of chloroplast present in the green leaves and convert it into Chemical energy
• A pigment called chlorophyll is present in the chloroplasts which are required in trapping sunlight
• Plants utilize Carbon dioxide and Water for the synthesis of carbohydrates during photosynthesis.
• The CO₂ gets reduced to form the carbohydrates while H₂O (Water) is oxidised and oxygen is liberated as a side product
• This gaseous exchange occurs through the stomata present on the leaf surface

These events can be demonstrated by the following equation:

\(\rm \underset{(Carbon\ dioxide)}{6CO_2} + \underset{(Water)}{6H_2 O} \xrightarrow[Chlorophyll]{Sunlight} \underset{(Carbohydrates)}{C_6H_{12}O_6} + \underset{(Oxygen)}{6O_2}\)