Explanations:Western disturbances are a significant weather phenomenon that affects the northwestern part of the Indian subcontinent, particularly the states of Punjab, Haryana, and parts of Rajasthan and Uttar Pradesh. These disturbances are extratropical storms that originate in the Mediterranean region and move eastward, crossing the Middle East and the Arabian Sea before reaching India. They are most active during the winter months, from December to March, and are responsible for bringing rain and snow to these regions.
The term "Western disturbance" refers to the fact that these weather systems originate from the western part of the globe and move towards the Indian subcontinent. They are distinct from the monsoon system, which is a seasonal wind pattern that brings heavy rainfall to most parts of India during the summer months. Western disturbances, on the other hand, are more sporadic and can bring significant precipitation to the northwestern states, especially Punjab, where they are a crucial source of winter rainfall.
Understanding the geographical location of the states mentioned in the question is key to identifying the correct answer. Punjab, being in the northwestern part of India, is one of the primary recipients of Western disturbances. This makes it the correct choice among the options provided. The other states mentioned—Mumbai (in Maharashtra), Chennai (in Tamil Nadu), and Allahabad (in Uttar Pradesh)—are not as significantly affected by Western disturbances, as they are either too far south or east to be in the direct path of these weather systems.
It is important to note that while Western disturbances are a significant source of winter rainfall in Punjab, they are not the only factor affecting the region's weather. The monsoon system also plays a crucial role in the overall climate of Punjab and other parts of India. However, for the purpose of this question, the focus is on the impact of Western disturbances, which makes Punjab the correct answer.