Discussion
Photic zone means :
Answer: C
The photic zone is the layer of ocean upto which sufficient light penetrates.
It is the sunlit surface layer, usually down to about 200 m in clear open water and much less in turbid coastal water, in which there is enough light for photosynthesis to exceed respiration. Phytoplankton, seaweeds and the food webs that depend directly on them are concentrated here.
The other options are wrong. Life is not confined to it: animals live throughout the dark water below, down to the deep-sea floor and the vent communities. Coral reefs occur in only a small part of the photic zone, in warm shallow tropical seas. And the layer in which photosynthesis is not possible is the opposite, the aphotic zone.
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