Question

What is loo what are its effects on people living in Northern plains of India

Answer 1

The moving of low pressure of wind to a higher pressure is called loo.Himalayas would mean no perennial rivers that form the large plains in north India i.e. Ganga, Yamuna, Brahmaputra, jhelum, sutlej, Indus and all others would not exist. No rivers and no rain. You can just imagine what condition India would have been in.