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The zone that would be most difficult for a plant to live in is the  Benthic zone. It is the zone at the lowest level of a body of  water.
Specifically, it covers: 1  The photic zone, the only region where plants and organisms that depend on photosynthesis can live. 2  The aphotic zone, where light is too dim for photosynthesis so organisms there rely on detritus (bits of decaying plants and animal waste that float down from the photic zone).