Question

Open water zone beyond littoral zone is

• A. Limnetic zone
• B. Benthic zone
• C. Profundal zone
• D. Coastal zone

Answer 1

The correct option is A Limnetic zone

Introduction to the littoral zone
The Littoral zone is the shallow coastal zone where light is available up to the bottom. Both producers and consumers are found in this zone. Rooted vegetation occurs along the shore.

Limnetic zone
The open water zone away from the littoral zone, up to the depth to which light can penetrate is called the limnetic zone. Sufficient light is present in this zone for photosynthesis by aquatic plants and is hence also considered as the photic zone. This zone contains phytoplanktons, zooplanktons, and floating as well as swimming animals.

Coastal zone
The littoral zone itself is known as the coastal zone where the water meets the land.

Profundal zone
The profundal zone lies between the photic and the benthic zones. Light does not reach this zone and hence plants are absent in this zone. Only actively swimming consumers are present.

Benthic zone
It is the bottom-most zone of the water body and is the zone of perpetual darkness. Only consumers and decomposers are found in this zone.

Final answer
(A) Limnetic zone