Section 44P(2) in The Bihar Co-operative Societies Act, 1935
(2)Subject to the provisions of sub-section (1), where a mortgage executed in favour of a Land Development Bank, either before or after the commencement of the Bihar Co-operative Societies (Amendment) Ordinance, 1975, is called in question on the ground that it was executed by the Manager of a Hindu joint family or a natural or legal guardian of a minor or disabled person for a purpose not binding on the members of such Hindu joint family or such minor or disabled person, the burden of proving the same shall, notwithstanding any law to the contrary, lie on the party alleging it.