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Question : The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called :

Answer»

Pelagic zone 
Benthic zone
Lentic one 
Littoral zone 

Solution :Littoral region is of aquatic plants located either at shore of pond or sea. So light is also obtained and also submerged in water.
The plants of this shore region are connected with MANY rich producers, that are from shore to bottom level in which more of red and brown algae region. Many different regions are located in aquatic ecosystem.
Pelagic region : Plants are not located in ocean or pond region or near to bottom, such region is called pelagic region.
Benthic region : If is a region near pond or bottom of the sea. Where no light is AVAILABLE. Microbes and Benthic organisms are seen in this region.
Lentic region : It is a region having water which is STABLE in aquatic ecosystem.


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