Which statement about the photic zone is true?
A)Light intensity increases with depth.
B)Organisms depend directly on organic substances "raining" down from the aphotic zone.
C)The photic zone is thicker than the aphotic zone.
D)The photic zone has sufficient sunlight for organisms to photosynthesize.
E)The water is typically green because of the abundance of organic matter

Question

Quizplus · Accepted Answer

The photic zone is the upper layer of water where sufficient sunlight penetrates for photosynthesis to occur. Therefore, statement D is true. Statement A is false because light intensity decreases with depth. Statement B is false because organisms in the photic zone use photosynthesis to produce their own organic substances. Statement C is false because the photic zone is typically thinner than the aphotic zone. Statement E is false because although the water can appear green due to the presence of phytoplankton, it is not because of organic matter.

Which Statement About the Photic Zone Is True