Sec-235(2) crpc

235. Judgment of acquittal or conviction. (1) After hearing arguments and points of law (if any), the Judge shall give a judgment in the case. (2) If the accused is convicted, the Judge shall, unless he proceeds in accordance with the provisions of section 360 hear the accused on the question of sentence, and then pass sentence on him according to law.

the purpose of hearing the convict is to award appropriate sentence. to determine what is the appropriate sentence for a convict the judge must know the antecedents of the the convict. a serious offence may be punished with a ligter sentence if it is found that the convict has extenuating circumstances.