What is penal provision if all the bank accounts are undiscl

Same is my query. Waiting for someone to enlighten me. :/

It is not clear to me also, why they are asking the individual account nos. while, as I understand, IT dept. can access all your bank accounts and do scrutiny based on PAN no. what guarantee is provided for individual privacy to the legitimate balances in various accounts maintained, will it not be a leakage problem like we are facing with mobile numbers being shared without our permission. further to this they made banks to allow e-filijng online which says " your account number will be shared with income tax dept for audit trail purposes" funny