It is given that in photosynthesis $C O_{2} + H_{2} O$ forms $C_{6} H_{12} O_{6}$ but respiration involves oxidation of $C_{6} H_{12} O_{6}$ to $C O_{2}$ and $H_{2} O$ for producing energy so can't plants directly use $C O_{2}$ and $H_{2} O$ to synthesize energy (in form of ATP) that they had obtained from atmosphere and water. If so then what's the use of photosynthesis for plants.

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Solution

The main use of photosynthesis is the chemical change that occurs in the leaves of green plants. It uses light energy to convert carbon dioxide and water into glucose.
Oxygen is produced as a by-product of photosynthesis
1. Photosynthesis is a process in which green plants use energy from the sun to transform water, carbon d
2. Ioxide, and minerals into oxygen and organic compounds.
3. During photosynthesis, light energy transfers electrons from water $(H_{2} O)$ to carbon dioxide $(C O_{2})$ , which produces carbohydrates.
4. In this transfer, the $C O_{2}$ is "reduced," or receives electrons, and the water becomes "oxidized," or loses electrons. Ultimately, oxygen is produced along with carbohydrates.
5. Respiration is the process through which energy stored in organic molecules is released to do metabolic work.

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{CO}_{2} + H_{2} O \overset{Chlorophyll}{\to} C_{6} H_{12} O_{6} + H_{2} O + O_{2}

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