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

(a) Malic  acid 

(b) Oxaloacetic acid 

(c) 3-Phosphoglyceric acid 

(d) Phosphogly ceraldehyde

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Correct option (c) 3-Phosphoglyceric acid 

Explanation :

In C3 -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 C3-pathway. Oxalo Acetic Acid (OAA) is the first stable compound in C4 -plants. It is a 4C compound.

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