The life sentence, along with a Rs1 million fine, was handed to Ali for sodomy.
The family of the victim will be given an additional 1 million rupees, which will be recovered, from the convict Ali.
Qadir said the Imran received four death sentences from the court.
Nonetheless, the prosecution chose to submit all its evidence to court so that the case remained airtight.
Zainab was found dead in a rubbish dump on January 9 in Kasur district near Lahore, in Punjab province, several days after her disappearance. Police officers resorted to aerial firing when violent protesters tried to storm commissioner office, killing two people and injuring three others.
Imran's arrest brought to light seven more killings and many Pakistanis have demanded he be publicly executed.
A total of 56 witnesses including Zainab's uncle and brother recorded their statements against Imran.
Earlier, his lawyer had withdrawn from the case after Ali had confessed to the crime, it was reported.
Imran Ali was identified as one of Zainab's neighbours.
Currently, Section 364-A of the PPC reads "Whoever kidnaps or abducts any person under the [age of 14] in order that such person may be murdered or subjected to grievous hurt... or to the lust of any person [sic] shall be punished with death". Prosecutor General Qadir, however, said, "All the requisites of justice and fairness had been strictly observed during the trial proceedings".
Part of the fine is to be given in compensation to Zainab's family. Police told that they had matched the DNA from eight girls' bodies, including the killer Imran, 24.
The girl's family registered a complaint with the local police after she went missing on January 4. Her body was discovered five days later.
The public demand for immediate arrest of the culprit resulted in an unprecedented search in which nearly all law enforcement and secret agencies took part.
Ali also confessed that he had raped and murdered nine girls. The apex court also expressed satisfaction on the performance of police.
Residents of Kasur have said the murder of the seven-year-old girl was the 12th such incident in a year. They quickly returned home, but by that time their daughter's body had been found and preparations for her funeral and burial were underway amid tight security.
The announcement came after the government released hundreds of political prisoners, including some prominent opposition members. While the government considers who will take his place, it has imposed a state of emergency for the next six months.
To date, more than 3,700 exoplanets have been confirmed, with more than 2,500 of those identified by the two Kepler missions. After waiting for few time, the Kepler spacecraft shined once again and that is when it was named as K2 Mission.
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BJP spokesperson GVL Narasimha Rao said the Congress's murky links to Nirav Modi's company were coming out of the closet. Gandhi said that the BJP is trying to divert the attention from the issue by pinning it on Congress and the UPA tenure.
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A 4.4 magnitude natural disaster hit south Wales on Saturday, causing tremors to be felt across western Britain . Another, from Reading, wrote: "I was wondering if this was an quake or someone dropped some furniture next door".
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