Answer:
1.Primitive subsistence farming.
2.Cereals like bajra and rice as well as vegetables/food crops to sustain their family.
3.Madhya Pradesh, Chhattisgarh, Asom and other North-Eastern states, Andhra Pradesh, Odisha and others.
4.An example is wheat which is a commercial crops in Punjab Haryana and Western region of Uttar Pradesh, but is a subsistence crop in Madhya Pradesh and some parts of Bihar.
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