Q.

The first stable product of CO2 fixation in sorghum is:                        [2021]

1 phosphoglyceric acid  
2 pyruvic acid  
3 oxaloacetic acid  
4 succinic acid  

Ans.

(3)

Sorghum is an example of C4 plant, so the first stable product of CO2 fixation in this plant is oxaloacetic acid.