Multiple choice

The first stable product of Crassulacean acid metabolism is

  1. PGA

  2. Malic acid

  3. Citric acid

  4. Succinic acid
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B Correct answer
Explanation

In Crassulacean Acid Metabolism (CAM) plants, CO2 is fixed at night into oxaloacetate, which is then converted to malic acid and stored in vacuoles. Malic acid is the first stable product of this carbon fixation pathway. PGA is the first stable product in C3 plants, while citric and succinic acids are involved in the Krebs cycle, not CAM photosynthesis.

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