1) you have stated that you are not satisfied with my answer as biological father has left the boiological mother and his consent is not necessary
2) Sections 9(1) and 9(2) of the Hindu Adoption Maintenance Act are relevant and reads as follows:-
"9. Persons capable of giving in adoption.-
(1) No person except the father or mother or the guardian of a child shall have the capacity to give the child in adoption.
(2) Subject to the provisions of sub-section (4), the father or the mother, if alive, shall have equal right to give a son or daughter in adoption:
Provided that such right shall not be exercised by either of them save with the consent of the other unless one of them has completely and finally renounced the word or has ceased to be a Hindu or has been declared by a court of competent jurisdiction to be of unsound mind."
3) the law is very clear that such right cannot be exercised by either of the parents of the child "save with the consent of the other, unless one of them has deliberately and finally renounced the world or has ceased to be a Hindu or has been declared by a Court of competent jurisdiction to be of unsound mind.