Why is rice the main crop cultivated in the Ganga-Brahmaputra basin ? Share with your friends Share 0 Atharva Jaurkar answered this SINCE CULTIVATION OF RICE NEEDS SUFFICIENT WATER , IT IS GROWN IN THE AREA WHERE AMOUNT OF RAINFALL IS HIGH. 0 View Full Answer Sania Singh answered this since cultivation of rice needs sufficient water, it is grown in the area where amount of rainfall is high 0