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CO2 is fixed in the stroma of the chloroplast leading to the synthesis of PGA from which glyceraldehyde phosphate is formed. From glyceraldehyde phosphate, sugar and starch are formed. All these do not require light. However, photolysis of water and phosphorylation of ADP to ATP requires light energy.

1. CO2 is fixed in the stroma of the chloroplast.
2. PGA is synthesised in the stroma.
3. Glyceraldehyde phosphate forms sugar and starch.
4. Photolysis of water requires light energy.

Correct answer: Photolysis of water requires light energy.

Solution

CO2 fixation, PGA formation, and sugar/starch synthesis are part of the light-independent reactions in the stroma. Photolysis of water occurs during the light reactions and needs light energy, so that statement is correct.

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