45) A genetic classification of streams was developed by W.M. Davis, following earlier ideas of:

46) Which is the mountain between the Black sea and Caspian sea?

47) Which of the following States of India has the largest area under tobacco cultivation?

48) In which one of the following years, India formulated the National Jute Policy with the objective of increasing productivity, improving quality, ensuring good prices to the jute farmers and enhancing the yield per hectare?

49) Which of the following items is chiefly manufactured in Australia?