Discussion
Assertion (A) : Tropical and subtropical seas are most suitable for OTEC.
Reason (R) : There is a certain minimum vertical gradient (\(\gt\) 25 °C/km) required for OTEC to become feasible.
Codes :
Answer: A
The keyed answer is that both statements are true and (R) explains (A).
Ocean thermal energy conversion runs a heat engine between warm surface water and cold deep water, so it needs a large temperature difference between the two. Tropical and subtropical seas have the warmest surface water, so they are the most suitable, which is the assertion. The reason states the need for a minimum temperature gradient with depth before OTEC becomes feasible, and that is why only such seas qualify. The codes calling (A) or (R) false are not supported.
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