Answer:
(i) A feeble high pressure area develops over the north western part India in the cold weather season. Light winds begin to blow outwards. (ii) These dry north westerlies winds come in contact with the Indian trades (north easterlies) over the Ganga valley. (iii) The direction of north easterlies changes as a result of this contact as well as under the influence of topography. (iv) Their direction is north westerlies down the Ganga valley and northerlies over the Ganga Brahmaputra Delta. (v) Over the Bay of Bengal, the trade winds retain their original north-easterlies direction, as they are free from the influence of any topography over the sea.
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