Photosynthetic organisms occur at different depths in the ocean. Do they receive qualitatively and quantitatively the same light? How do they adapt to carry out photosynthesis under these conditions?
Light is seldom a photosynthesis limiting factor, because light saturation is 10% of the full sunlight. Light is rarely a limiting factor, with the exception of plants in shade or in dense forest. Photosynthetic organisms are found at different depths on oceans, and they are sufficient to execute photosynthesis by using enough light. In addition, the photosynthetic pigments of these organisms show considerable variations. These pigments help these organisms even in low light conditions to perform photosynthesis.