He don’t have any material to offer, He can only bow my head as gesture of respect and “Pranam” greeted, which signify that he offered himself to Divine-God.
Arjuna was surprised watching universal Form of Divine-God, his body was filled with thrill. He stated folding hands and bowing head viewing Universal form of Divine-God. (Bhagwat-Gita: 11/14}
Arjuna was astonished by viewing form of Divine-God which he had never imagined on such subject of Divine-form. Arjuna was excited and pleased that on mercy Divine-God has talk about his extraordinary spiritual message thereafter has shown his extraordinary Divine-Form.
Arjuna was in deep though after watching extraordinary grate Divine-Form that how he should give thanks to Divine-God? He don’t have any material to offer, He can only bow my head as gesture of respect and “Pranam” greeted, which signify that he offered himself to Divine-God. Therefore folding hands bowing head respectfully Arjuna started praising element of Divine-God