The aphotic zone is
A) a thin layer, about 100 m or less.
B) organic substances rain down from the photic zone.
C) where plants receive enough light to photosynthesize.
D) all of these.

Question

Quizplus · Accepted Answer

The aphotic zone is the portion of the ocean where there is little to no light penetration. It typically begins at a depth of 200 meters and extends to the ocean floor. As a result, organic substances from the photic zone, where photosynthesis occurs, rain down into the aphotic zone, making it an important site for marine food webs. It is also home to a diverse group of organisms that have adapted to living in complete darkness. However, the aphotic zone is much thicker than 100m, making choice A incorrect, and plants cannot photosynthesize in complete darkness, which rules out choice C.

The Aphotic Zone Is