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In photosynthesis, oxygen is released as a by-product when:
AWater molecules are split
BCarbon dioxide is fixed in the stroma
CATP is converted into ADP
DGlucose is broken into pyruvate
Answer & Solution
Correct answer: A. Water molecules are split
1. In the light reaction, photosynthetic pigments absorb light energy.
2. This energy splits water molecules in the thylakoid membranes.
3. The splitting of water releases oxygen as a by-product.
4. CO2 fixation occurs in the dark reaction and does not release oxygen, so that option is wrong.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 12 Plant Anatomy and Plant Physiology "Photosynthesis", p.188_
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