Assertion (A) : Arabian Sea branch of South West Monsoons is responsi...
(i) The part of South-West Monsoons which blows over Arabian sea is responsible for high rainfall on the Western coast of India.
(ii) These winds enter through Saurashtra and enter the Northern plains. These winds strike the Himalayas and give fairly good rainfall as they have abundant moisture.
(iii) South-West monsoons are perpendicular to the direction of Western Ghats. Thus, they give heavy rainfall on the windward side of the Western Ghats.
(iv) Central Peninsula lies on the leeward side of the Western Ghats. Thus, the Arabian Sea branch of South-West monsoon does not reach this region.
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Assertion (A) : Arabian Sea branch of South West Monsoons is responsi...
Assertion (A) : Arabian Sea branch of South West Monsoons is responsible for good rainfall in the Northern Plains of India
Reason (R) : The part of South West Monsoons which blows over the Arabian Sea is responsible for high rainfall on the western coast of India.
The correct answer is option A: Both (A) and (R) are true and (R) is the correct explanation of (A).
Explanation:
The South West Monsoons are the major source of rainfall in India. This monsoon occurs from June to September and brings rain to various parts of the country. The Arabian Sea branch of the South West Monsoons plays a significant role in providing rainfall to the Northern Plains of India.
Arabian Sea branch of South West Monsoons:
1. The South West Monsoons originate from the Arabian Sea and Bay of Bengal.
2. The Arabian Sea branch of the monsoons brings moisture-laden winds to the western coast of India.
3. These winds blow from the southwest direction and carry moisture from the Arabian Sea.
4. As these winds move inland, they encounter the Western Ghats mountain range along the western coast.
5. The Western Ghats act as a barrier and force the winds to rise, resulting in orographic rainfall along the western coast.
6. This orographic rainfall is responsible for high rainfall on the western coast of India, including regions like Kerala, Karnataka, and Maharashtra.
Rainfall in the Northern Plains:
1. The Arabian Sea branch of the South West Monsoons continues to move northwards after crossing the Western Ghats.
2. These winds, known as the Arabian Sea branch, bring moisture to the Northern Plains of India.
3. The Northern Plains include states like Punjab, Haryana, Delhi, Uttar Pradesh, and Bihar.
4. As the Arabian Sea branch moves over the Northern Plains, it brings rainfall to these regions.
5. The flat topography of the Northern Plains allows the winds to spread out and cover a larger area, resulting in good rainfall distribution.
6. The presence of rivers like the Ganga and Yamuna further enhances the rainfall in the Northern Plains.
Conclusion:
The assertion (A) is true as the Arabian Sea branch of the South West Monsoons is responsible for good rainfall in the Northern Plains of India. The reason (R) is also true as the same branch of monsoons that brings rainfall to the Northern Plains is responsible for high rainfall on the western coast of India. Therefore, both (A) and (R) are true, and (R) is the correct explanation of (A).
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