Clubbing of Income

both case are identical the only difference is, in 1st case it is a direct gift and in 2nd case it is an indirect gift. in both the cases interest will be chargable to tax in your hand not in your mother hand 

A son can gift any amount to his mother and it would be a capital receipt by the mother without any tax implications for either the son or the mother.Mother can invest such amount in F.D.s and the interest earned would be chargeable in her hands only.Option 1 is the correct way to proceed.
 

The best way is to make a gift deed passing money to mother permanently, with no any interest in future..

than the money earned from that amount will be charged to receiver's income i.e mother's income

and hence, it should be shown in mother's income tax return

THAT MEANS AN IRROVOCABLE TRANSFER DEED IS TO BE MADE THEN IT WILL BE TAXED TO MOTHER ORELESE IT WILL BE CLUBBED TO YOU AND IF YOU CONVERT THE IRREEVOCABLE DEED TO A REVOCABLE ONE FROM THAT YEAR INCOME WILL BE TAXED TO YOU