accused to act as a pleader

Yes ... he can seek permission of the court and cross examine, plead & argue his case ... but it is advisable that one should do so only if he/she has the requisite legal knowledge .....

YES HE CAN.

BUT NOT SUGESTABLE, UNLESS OTHERWISE HE IS A HARD PERSON AND ABLE TO DEAL THE THINGS PROPERLY.

ANYHOW IT IS LEGALLY ALLOWED.

Thanks for the reply. Can you please mention corresponding legal provision in act? Further, can layman file his own case and do all necessary what advocates do?

See section 205 read with section 302 of the Criminal procedure Code. Refer to the case of Jimmy Jahingir Madan vs Bolly Cariyappa Hindley (D)  by Lrs: 2004-(009) 0558-SC: Coram: B.N.Agarwal and H.K.Sema,JJ.

After seeking permission, the accused can cross prosecution witnesses and argue for his case.