(1) Where by reason of the provisions contained in section 4, the value of any assets transferred to any of the persons mentioned in that section have to be included in the net wealth of an individual, the person in whose name such assets stand shall, notwithstanding anything contained in any law to the contrary, be liable, on the service of a notice of demand by the ¹[Assessing Officer] in this behalf, to pay that portion of the tax assessed on the assessee as is attributable to the value of the asset standing in his name as aforesaid:
     Provided that where any such asset is held jointly by more than one person, they shall be jointly and severally liable to pay the tax as is attributable to the value of the asset so jointly held.
     (2) Where any such person as is referred to in sub-section (1) defaults in making payment of any tax demanded from him, he shall be deemed to be an assessee in default in respect of such sum, and all the provisions of this Act relating to recovery shall apply accordingly.