Question

how did the iqta system led to the jagirdari system in India

Answer 1

Iqta System.
Under Iqta System, the land of the empire was divided into several large and small tracts called Iqta and assigned these Iqtas to his soldiers, officers and nobles. In the beginning, an Iqta was based upon salary. Later, under Firoz Shah Tughlaq it became hereditary
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Jagirdari system.
also spelled as jageer, was a type of feudal land grant in South Asia at the foundation of its Jagirdar system. ... The conditional jagir required the governing family to maintain troops and provide their service to the state when asked.