Correct Option
The correct option isThe wet and dry spells where rains take place only for a few days at a time.
Explanation
The South West Monsoon in India is not a continuous period of rainfall. It is characterized by a pulsating nature, resulting in alternating periods of rainfall (wet spells) and rainless intervals (dry spells). This intermittent pattern is a defining feature of the monsoon season.
Detailed Analysis
- The wet and dry spells where rains take place only for a few days at a time. is Correct: The phenomenon of 'breaks' in the monsoon refers specifically to the wet and dry spells where rains occur for a few days and are followed by rainless intervals. These breaks can last for a few days to several weeks.
- Mechanism: The breaks are primarily related to the movement of the Monsoon Trough. When the axis of the monsoon trough shifts closer to the foothills of the Himalayas, rainfall decreases significantly over the plains of North India (leading to a 'break') but increases in the Himalayan foothills and the Northeast.
- On the West Coast, breaks occur when humid winds blow parallel to the coast rather than striking it perpendicularly.
- The sudden onset of monsoon winds. is Incorrect: The sudden onset of monsoon winds, associated with violent thunder and lightning, is termed the 'burst' of the monsoon.
- The withdrawal of monsoon from the country. is Incorrect: The withdrawal of the monsoon from the country is a distinct phase known as the Retreating Monsoon, which typically begins in September.
- The deflection of monsoon winds by the Himalayas. is Incorrect: While the Himalayas do act as a barrier affecting wind direction, the specific term 'break' refers to the temporal gap in rainfall, not the deflection of winds itself.
Key Takeaway
Monsoon Breaks are the rainless intervals that occur during the South West Monsoon season, primarily caused by the shifting of the monsoon trough towards the Himalayas or changes in wind direction along the coast.