Punjab and Haryana grow rice mainly due to (1) availability of cheap labour. (2) development of canals irrigation and tube-wells. (3) fertile soil. (4) development of the transport network.
Answer: (2) development of canals irrigation and tube-wells
Rice is grown in the plains, coastal areas and delta regions of northern and north-eastern India. In less rainy areas such as Punjab, Haryana and western Uttar Pradesh and parts of Rajasthan, the construction of a dense network of canal irrigation and tube wells has made it possible to grow rice.