The court had allowed Ansari's plea to examine Afroz Khan, an accused in another terror case, Uday Pathak, a murder accused, and his brother Imtiyaz Rahim.
The court, which convicted 10 out of 13 accused on March 29 in the blasts case, is hearing arguments on quantum of sentence.
The Mulund train blasts had occurred on March 13, 2003 killing 12 persons and injuring 71. On December 6, 2002, several persons were injured in the blast at the McDonald's at Mumbai Central station while a person died when a bomb attached to a cycle exploded in a market area in Vile Parle (East) on January 27, 2003.
"Muzammil was so good in studies that he secured a scholarship and his fees were waived", Rahim deposed.
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Rahim also told the court that after their father's sickness, the family's financial condition was very bad and at that time Muzammil contributed financially and also took care of his siblings' education.
He further said that after Muzammil's arrest, the family looked for him for many days (as they were not aware that he is arrested).
Rahim also said that whenever the family visited Muzammil in court or jail they always felt that he was innocent and would come out sooner or later.
"If he is given maximum sentence, the parents will die upon hearing about it", Rahim told the court.
While another terror case accused Afroze Khan told the court that he had met Muzammil in Thane jail in 2008. Khan added that when he was suffering from tuberculosis, Muzammil took good care of him.
"In both the jails, Muzammil used to help inmates in
Afroze said that in Arthur Road Jail, Muzammil is kept in 'Anda cell' where there is no sunlight or fresh air.
"In Thane, Muzammil was healthy and had lot of hope (about the case) but in Arthur road jail Muzammil was depressed," Afroze told the court.
Murder accused Phatak told the court that Muzammil used to help a lot of inmates in education.
"Muzammil advised me to pray and gave me a copy of 'Hanuman Chalisa'," Phatak said.
"Muzammil used to tell other inmates to behave properly so that they can be released early," Phatak told the court.
He said that when Muzammil was shifted to Arthur Road jail and once he met him, he asked Muzammil if he recognises him. "Muzammil could not remember at first but later recollected," Phatak said.
Phatak also said that condition in the high security cell in Arthur Road jail is so harsh that even a normal person will suffer psychological disorder.
"It is enclosed from all sides with grill on one end and three-four persons are dumped inside though it's meant for one inmate," Phatak told the court.
The court will resume hearing the arguments on quantum of sentence on Monday.