Class IX, NCERT Geography - Contemporary India I Lesson 3, DRAINAGE Extra Study Material (sample questions) Question.1: Which is the largest tributary of the Ganga? Question.2: Which is the main watershed in Peninsular India? Question.3: Define: (a) Oxbow lake, (b) Drainage, (c) Distributary, (d) Meandering and Meanders, (e) Delta, (f) Estuary, (g) Lake, (h) River.