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In C3 plants, the first stable product of photosynthesis during the dark reaction is

1. Malic acid
2. Oxaloacetic acid
3. 3-phosphoglyceric acid
4. Phosphoglyceraldehyde

Correct answer: 3-phosphoglyceric acid

Solution

In C3 plants, CO2 is fixed by RuBisCO in the Calvin cycle, and the first stable product formed is a 3-carbon compound: 3-phosphoglyceric acid (3-PGA). Malic acid and oxaloacetic acid are typical first products in C4/CAM pathways, not C3 plants.

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