section ?

You will find the reference in Sec 3(1)(iv) i.e. definition of public co.

"public company" means a company which-

 

(a) is not a private company;

(b) has a minimum paid-up capital of five lakh rupees or such higher paid-up capital, as may be prescribed;

(c) is a private company which is a subsidiary of a company which is not a private company.
 

Section 3 (1) (iv)