Which of the following atmospheric conditions influences the climate and weather conditions in India?
(A) Western cyclonic disturbances and tropical cyclones
(B) River navigation and hydro-power generation
(C) Unique pressure and wind conditions
(D) Subtropical westerly jet streams
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A), (C) and (D) only
India’s climate is controlled by atmospheric conditions: the pressure and winds at the surface, the circulation of the upper air, and the disturbances and cyclones that move in. Each item is checked against this:
(A) Western cyclonic disturbances and tropical cyclones Correct. Western disturbances from the Mediterranean bring winter rain to north-west India, and tropical cyclones from the Bay of Bengal and the Arabian Sea bring heavy rain to the coasts.
(B) River navigation and hydro-power generation Incorrect. These are uses of rivers, not conditions of the atmosphere, and they do not control weather or climate.
(C) Unique pressure and wind conditions Correct. The seasonal reversal of pressure and winds between land and sea drives the monsoon.
(D) Subtropical westerly jet streams Correct. In winter the westerly jet stream blows south of the Himalayas and steers the western disturbances into India; its shift north in summer helps the monsoon to set in.