hello everyone today I'm going to explain Lake ecosystem it is also one of the important long answer question from the unit Ecology of first year geology so in the ecosystem we have a different type of ecosystems like terrestrial ecosystem aquatic ecosystem so in the aquatic ecosystem we have a fresh water Marin water braish water ecosystem so the lake ecosystem comes under the fresh waterer ecosystem Lake ecosystem best example to the aquatic ecosystem so here lake is deeper than the pond and it have a Still Water bodies means there is no movement of water it is still water bodies that is why it is called as a lentic and one more we have lotic in the lotic the water bodies are moving example Rivers lotic floti rhyming but here lentic means Still Water bodies the water is still remain at one place like River Pond Reservoir so Lake ecosystem comes under Still Water bodies that is lentic so in the lake ecosystem photosynthesis is there automatically these are autot tropes the het tropes depends on the autor tropes and also here the important decomposition is occur mineralization occur and also recycling circulation of the nutrients that is Lake ecosystem in the deeper leak we Lake we have a three type of Jones so this sequence of Jones also very much important in the McQ of Nate and mset you have to remember the sequence from upper to lower lower to Upper that is loral Jone ltic Jone profundal Zone lit Lim profundal first lit loral litic profundal so you have to remember in the sequence so for example this is taken as a Lake this is the shore shore means the edge of the lake so first of all the loral Zone it is in the part of Lake ecosystem and it is very near to the shore shore means here Edge Edge of the lake so here loral zone is near to the shore and also here we have a sunlight the sun light reach up to this bottom of the this Zone that is why they can increase the photosynthesis automatically photosynthesis is high there is number of plants and organisms also they can survive then Rich axy also present in this Stone so here shallow part of the lake close to the shore Light reaches up to the bottom that is why it is called also eortic Jone you want presence eotic photo means light eortic zone light penetrating zone is what among all so euphoric zone is loral Zone then High Rich of vegetation and high rate of photosynthesis automatically High Reach of oxygen also present in the loral zone then come to the next Zone lytic zone so it is a this is litic Jone it is not up to the bottom so it is it is litic Zone second zone is litic so it is a central zone it is a open Zone it is away from the shore loral is near to shore but here litic is away from Shore so it is very far to the shore that is why Lim natic zone is central open and away from the shore and also it does not touch the bottom so here only this Zone will be end and zone of compensation separate lytic and profundal so here this have a compensate Zone this Zone will separate the litic zone and profundal Zone litic Zone doesn't enter means through the bottom and also it is extend vertically up to the effective light penetration level so here the light penetration loral is up to bottom but in Li itic very much low not up to the end so that is why the moderate amount of photosynthesis moderate plants moderate of oxygen levels that is the LI litic Zone last profundal zone so this is the profundal Zone this is the last zone of Lake ecosystem and also deep water Zone below the litic and here light is absent here there is noow light same as it is opp Opposite to the loral Zone loral versus profundal antagonistic to the loral and profundal so there is no light there is no photosynthesis there is poor of oxygen and also decomposition rate also high in the profundal mineralization decomposition recycling zone is profundal Zone that is third then here in the next point we have to write the biotic components of Lake what are present in loral litic and profundal so in the loral we have a flora and fun Flora means plants f means animals in the loral Jone we have a free floating hydropi that is pistia and LNA rooted hydroides nyia submerged rooted hydrophytes ficaria phytoplanktons diatoms and green alga you have to remember examples and come to f j Plankton's example Daphne and rotifer newon and necton this is also important two marks questions newon means they are living on the surface of water in the EP hypon also there new here you concentrate s means they survive at surface neon means swimming example fishes and snakes Peron Perry means phon phyto means plants they lives around the plant Hydra and nymphs BOS B for bottom they can live in the bottom crayfishes red anals then biotin second litic Jone phytoplanktons are there Jank are there nect tons are there same examples then biot profundal zone so here there is no light there is no photosynthesis there is poor supply of oxygen that is why here decomposers are there drus feeders are there chironomid larvas also present so they can survive at the low oxygen level so this is the Jone for recycling of minerals and nutrients so this is the lake ecosystem what are the Jones what is the light penetration rate and what are the biota so you have to remember at the same time McQ also which is called eortic Zone which zone is have a dim light which zone is not any light which zone is called as a recycling zone so this is the mcqs and as well as the long answer question for the IP thank you if you like the video please share and subscribe