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Assertion (A): El Nino and the Southern Oscillation are treated as a single phenomenon.
Reason (R): The oceanic warming and the atmospheric pressure seesaw are coupled and occur together.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both are true and the reason gives the justification for the combined name, and the coupling between them is what allows the event to develop and to persist. Ocean and air act together. Neither half of the phenomenon stands alone.

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