question_answer 31)

  The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called (a)pelagic zone                  (b) benthic zone              (c)lentic zone                     (d) littoral zone

Answer:

                  (d) The littoral zone is the zone at the edge of a lake or ocean or in aquatic habitat which is alternatively exposed to air, hence, light is also available and immersed in water. This costal zone is rich producers from surface to bottom, with a large number of brown and red alga attached at the zone. Different zones is an equatic ecosystem. Pelagic zone Any zone of water in a sea or lake that is neither close to bottom nor the shore is pelagic zone. Benthic zone It is the bottom part of the water body (aphotic zone) light is not available here and it is dark. Microorganisms and benthic organisms are found in this zone .Lentic zone refers to standing or relatively still water in an equatie ecosystem.     Different zones in an equatic ecosystem