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
Under which condition is a lake considered part of an inland drainage system?HardLevel 38What is the most scientific reason for increasing salinity in lakes like Sambhar?HardLevel 38What does it mean to consider Wular Lake a tectonic lake?HardLevel 38Which water condition can form in lagoon lakes due to mixing of sea and river water?HardLevel 38Which sequential process is most correct in the formation of an oxbow lake?HardLevel 38Why can deforestation in a lake catchment increase siltation?HardLevel 38What is the most logical effect of siltation on lake water storage?HardLevel 38If a coastal lake's connection with the sea becomes partly blocked which change is possible?HardLevel 38What is the main reason for considering Chilika Lake important for biodiversity?HardLevel 38Why can eutrophication occur when nutrient pollution increases in lakes?HardLevel 38The phumdis of Loktak Lake show which complex ecological process?HardLevel 38In which condition will drying of a lake be considered human-induced?HardLevel 38Which lake is best identified with closed drainage and salt production in Rajasthan?HardLevel 38What is the importance of a green buffer around a lake?HardLevel 38Why can mountain glacial lakes create a sudden flood risk?HardLevel 38What will be the result if dissolved oxygen decreases in a lake?HardLevel 38Which relation is most correct for understanding the geography of Vembanad Lake?HardLevel 38Through which process can a curved river channel gradually turn into an oxbow lake?HardLevel 38The effect of lakes on local climate is linked with which physical property?HardLevel 38Which statement correctly distinguishes a coastal lake from an inland saline lake?HardLevel 38