Question

Which one of the following shows the correct sequence of places in descending order of the average summer rainfall?
A. Jaisalmer, Pune, Allahabad, Cherrapunji
B. Cherrapunji, Jaisalmer, Pune, Allahabad
C. Allahabad, Pune, Jaisalmer, Cherrapunji
D. Cherrapunji, Allahabad, Pune, Jaisalmer

Answer 1

Hint: Many regional variations are expressed in the climate of India, in the rhythm of seasons, the pattern of winds, temperature and rainfall, and the degree of wetness or dryness. These regional diversities are described as Subtypes of monsoon climate.

Complete answer: Surface pressure and winds: By the center of July, the low-pressure belt closer to the surface, named as Inter-Tropical Convergence Zone (ITCZ), moves northwards, generally corresponding to the Himalayas. The westerly jet stream withdraws from the Indian region, by this time. The ITCZ attracts an inflow of winds from different directions since it’s a low-pressure zone. This moist air current is known as the southwest monsoon.
Jet streams and Upper-Air circulation The pattern of pressure and winds is formed only at the level of the troposphere. In June, an easterly jet stream flows over the southern part of the Peninsula.
Easterly Jet streams and Tropical Cyclones The tropical depressions are steered into India through the easterly jet stream. The distribution of monsoon rainfall over the Indian subcontinent is determined by these depressions. In the summer the mercury occasionally touches $55^\circ {\text{C}}$ in western Rajasthan, but on the other hand, the mercury hardly touches $19^\circ {\text{C}}$ in the North-East region. Dust storms are very common during May in Punjab, Uttar Pradesh, and some other states. These local storms are associated with torrential rains, violent winds, and even hailstorms. The climate of India is monsoonal in rhythm and character, in spite of these differences and variations.

Thus, option (D) is correct.

Note:Factors such as surface pressure and winds, jet streams and upper air circulation, and easterly jet streams and tropical cyclones play a very important role in determining the weather mechanism.