a. Littoral zone: Shallow water zone around the edge of the lake which supports rooted vegetation. Light penetrates through this zone.
b. Limnetic zone: Open water zone beyond littoral zone is called limnetic zone. In limnetic zone, phytoplank tons grow in abundance.
c. Profundal zone: The dark zone where light does not reach is called profundal zone.
d. The sediments at the botton of lakes and ponds form the benthic region.
