Answer:
Photosynthesis occurs in the photic part of a water body.
Step-by-step explanation:
The word photic means light. The photic part of a water body is the part of the water body into which light can penetrate. It usually extends from the surface until the part of the water body where light penetration is only about 1% of the light penetrating the surface.
Photosynthetic organisms are found here because they utilize the light from the sun for photosynthesis.