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

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Q. In $ {{C}_{3}} $ plants, the first stable product of photosynthesis during the dark reaction is

CMC MedicalCMC Medical 2009

Solution:

In $ {{C}_{3}} $ plants, the first stable product formed during dark reaction is 3-phosphoglyceric acid. Since, it is a 3-carbon compound hence, the pathway is referred as $ {{C}_{3}} $ pathway. Oxaloacetic acid (OAA) is the first stable product compound in $ {{C}_{4}} $ plants. It is a 4C compound. This acid is converted to another 4C acid malic acid which enters into the chloroplast of bundle sheath cells. In $ {{C}_{3}} $ cycle, 3PGA is phosphorylated into 1, 3-diphosphoglyceric acid, which is reduced into 3-phosphoglyceraldehyde.