Which Indian climate term is correctly associated with classification or identity “the warm phase of the El Nino-Southern Oscillation”, and also with “it involves unusual warming in the central and eastern equatorial Pacific”?

Correct Answer: Option A — El Nino. El Nino is correctly identified as the warm phase of the El Nino-Southern Oscillation. El Nino is also associated with it involves unusual warming in the central and eastern equatorial Pacific. 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 B — La Nina: La Nina is the cool phase of the El Nino-Southern Oscillation. It is incorrect here because La Nina is instead associated with it involves unusual cooling in the central and eastern equatorial Pacific. • Option C — Southwest Monsoon: Southwest Monsoon is the principal rain-bearing seasonal wind system of India. It is incorrect here because Southwest Monsoon is instead associated with it reaches India from the Arabian Sea and Bay of Bengal sectors. • Option D — Northeast Monsoon: Northeast Monsoon is a seasonal wind regime associated with the retreating-monsoon period. It is incorrect here because Northeast Monsoon is instead associated with it is especially important for rainfall over coastal Tamil Nadu. Exam Takeaway: Connect El Nino with “the warm phase of the El Nino-Southern Oscillation” and “it involves unusual warming in the central and eastern equatorial Pacific” for revision.