LIFE SCIENCE

Detailed explanation-1: -The photic zone extends from the topmost surface to a depth of 200 meters. This is the only zone where the marine biome can perform photosynthesis as the sunlight can only penetrate a depth of up to 200 meters and therefore being named aphotic zone.

Detailed explanation-2: -The photic zone extends to a maximum depth of 200 meters (656 feet) below the surface of the water. Enough sunlight penetrates the photic zone for photosynthesis to occur, allowing for large amounts of biomass and biodiversity. Algae and other photosynthetic organisms can make food and support food webs.

Detailed explanation-3: -Below the photic zone, from 200 to 1, 000 meters, is the aphotic (a meaning without and photic meaning light) zone. In the aphotic zone; all that’s left of sunlight is a dim, dark, blue-green light, too weak to allow photosynthesis to occur.