47) Seed treatment of which crop is done by Captan or Cerasan @ 5 gm/kg seed?

48) River Narmada flows down from Amarkantak Hills to the sea. What is the name of the area where it meets the sea?

49) The country where drip irrigation is efficiently used is

50) On which one among the following islands does the Negrito tribes called ’the Onge’ live?

51) Which state of India records the highest production of tea?