Geography
Lakes
झीलें
In Class 9 Geography, the topic “Lakes” explains how these water bodies form part of the drainage system and differ from rivers in their shape, movement, and location. Students learn about natural lakes formed by tectonic activity, glaciers, river courses, and coastal processes, as well as human-made reservoirs. Indian examples such as Wular, Dal, Sambhar, Chilika, and Kolleru help connect ideas with maps and landscapes. The topic also examines how lakes store water, support irrigation, hydropower, fisheries, biodiversity, tourism, and flood regulation.
Practice questions
Why can natural recharge decrease when paved surfaces increase in a lake catchment?HardLevel 40Bird diversity in Chilika Lake is a result of what?HardLevel 40Which lake is appropriate to link with Srinagar's economy and tourism?HardLevel 40Which is the most integrated measure for lake conservation?HardLevel 40Under which condition will the ecological balance of a lake be most at risk?HardLevel 40Which option correctly shows diversity in lake origin?HardLevel 40What can be the combined effect of reduced inflow and increased siltation in a lake?HardLevel 40Why should a conservation plan for lakes consider not only lake water but also the catchment area?HardLevel 40If a lake shows excessive algal growth along with fish death what can be a likely cause?HardLevel 40Why is local community participation important in long term lake conservation?HardLevel 40In which situation can a lake indicate a closed drainage basin?ExpertLevel 38The mixing of saline and freshwater in Chilika Lake can be explained by which geographical condition?ExpertLevel 38How is the combined effect of river erosion and deposition seen in oxbow lake formation?ExpertLevel 38Which water balance supports salt production in Sambhar Lake?ExpertLevel 38What conclusion is correct when Wular Lake is linked with a tectonic depression?ExpertLevel 38If inflow decreases and evaporation increases in a lake what is the most likely result?ExpertLevel 38What long-term problem arises when soil erosion increases in a lake catchment?ExpertLevel 38In eutrophication how can ecological stress in a lake increase?ExpertLevel 38Why is it incomplete to call Loktak Lake's phumdis only islands?ExpertLevel 38What is the role of a sandy barrier in a coastal lagoon?ExpertLevel 38