Which of the following statements regarding monsoon trough is/are correct? 1. It is a region of low pressure extending from northwest India to the Bay of Bengal. 2. The north-south oscillation of this trough affects rainfall distribution. 3. It remains stationary throughout the monsoon season. |ForumIAS

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: A

Notes:

Explanation:

The monsoon trough is an elongated area of low pressure that forms during the monsoon season. It typically extends from the northwestern region of India (like Rajasthan) to the Bay of Bengal.
It is associated with the intermittent movement of the monsoon low and governs the spatial distribution of rainfall across the Indo-Gangetic plains and beyond.
The north-south movement (oscillation) of the monsoon trough is a key reason for the variability in rainfall. When the trough shifts northwards, rainfall increases over the Himalayan foothills and plains. When it shifts southwards, rainfall intensifies over central and peninsular India.
The monsoon trough is not stationary. It shifts regularly in response to pressure gradients, Himalayan heating, and monsoon depressions from the Bay of Bengal. Its dynamic nature is crucial for the periodic rainfall episodes during the June–September monsoon period.

Source: India Physical Environment (Class 11th NCERT)

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