Question

Punjab-Haryana plain has become a granary of India.

Answer 1

The location and fertility of the soil in Haryana and punjab has made these states The Granary of India
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Answer 2

it has  fertile  alluvial soil.
it has plenty of water for irrigation through canals and tube wells.
climate is well suited for rabi and kharif crops..
because of this it produces surplus of food grains.
By these terms punjab and haryana  has become granary of india