Which Indian climate term is correctly associated with important geographical fact “its influence on Indian rainfall is important but not identical in every event”, and also with “the warm phase of the El Nino-Southern Oscillation”?

Correct Answer: Option D — El Nino. El Nino is correctly identified as its influence on Indian rainfall is important but not identical in every event. El Nino is also associated with the warm phase of the El Nino-Southern Oscillation. Another identifying fact about El Nino is that it can alter atmospheric circulation affecting the Indian monsoon. A further exam-relevant fact about El Nino is that its influence on Indian rainfall is important but not identical in every event. Why the other options are incorrect: • Option A — La Nina: La Nina is La Nina should not be treated as a guaranteed cause of uniform excess rain across India. It is incorrect here because La Nina is instead associated with the cool phase of the El Nino-Southern Oscillation. • Option B — Southwest Monsoon: Southwest Monsoon is its advance and withdrawal organize much of India's rainy season. It is incorrect here because Southwest Monsoon is instead associated with the principal rain-bearing seasonal wind system of India. • Option C — Northeast Monsoon: Northeast Monsoon is Bay of Bengal depressions and cyclones can enhance its rainfall. It is incorrect here because Northeast Monsoon is instead associated with a seasonal wind regime associated with the retreating-monsoon period. Exam Takeaway: Connect El Nino with “its influence on Indian rainfall is important but not identical in every event” and “the warm phase of the El Nino-Southern Oscillation” for revision.