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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

If a lake has no external outlet, with which type of drainage is it appropriate to associate it?ExpertLevel 37 Which problem may increase due to excessive spread of water hyacinth in lakes?ExpertLevel 37 Which clue is more useful in identifying tectonic lakes?ExpertLevel 37 Why can salinity vary in lagoon lakes?ExpertLevel 37 Which option gives a correct lake conservation measure?ExpertLevel 37 What effect can shrinking lakes have on local society?ExpertLevel 37 Why is it useful to study lakes in connection with wetlands?ExpertLevel 37 Which natural action can mainly contribute to the formation of coastal lagoon lakes?ExpertLevel 37 When lake water quality declines, which area may be affected first?ExpertLevel 37 Seasonal fluctuation in lake water level may be most related to what?ExpertLevel 37 Which statement correctly shows the multipurpose importance of lakes?ExpertLevel 37 If an area has many lakes, what care should be taken in local map study?ExpertLevel 37 Which measure is more effective to reduce sediment deposition in lakes?ExpertLevel 37 Which classification is most useful while studying the origin of lakes?ExpertLevel 37 What is the most reliable basis to distinguish lagoon, oxbow and tectonic lakes?ExpertLevel 37 Why can the effect of pollution remain longer in lakes due to stagnant water?ExpertLevel 37 In which condition can a lake help in local groundwater recharge?ExpertLevel 37 Why can the impact of landslides be serious in mountain lakes?ExpertLevel 39 Under which condition can a lake act as a natural sedimentation area for a river?ExpertLevel 39 If the outflow of a lake is controlled what can be its main use?ExpertLevel 39