C3 plants are so named because
Athe first stable fixation product is 3-carbon (3-PGA)
Bthey have exactly three chloroplasts per cell
Cthey need three units of CO₂ to make one ATP
Dtheir leaves have three layers of mesophyll
Answer & Solution
Correct answer: A. the first stable fixation product is 3-carbon (3-PGA)
C3 refers to the 3-carbon first stable product (3-phosphoglyceric acid, 3-PGA) of the Calvin cycle. Crops like wheat and rice are C3. The 'C' counts carbons in the first stable product. C4 plants are named the same way (first stable product is 4-carbon oxaloacetate).
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