Question

Why is northern plain density populated state 3 reason

Answer 1

Hope it helps....!!!
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Northern plains are densely populated because: 

=> It has adequate water supply for agriculture. 

=> It has favourable climate which is good for agriculture and human settlements. 

=>The deposition of alluvium, has made the most fertile plain in the world.
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Answer 2

Water Availability : The northern pains have a large number of rivers and streams. The water is extremely essential for livelihood. Rivers like Ganga, Yamuna, Indus, Kosi, Chambal, Sutlej etc.

Food Supply : Early humans were hunters and therefore had to keep travelling to eat but when they learnt how to cultivate food they started to settle down. To grow food you need fertile soil.

Economical Benefits : As food supply picked up so did prosperity. everyone wants to be rich. So people colonized only those areas where they could earn a livelihood because no one would make a home in a desert and no one wants to be poor.