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
Which problem can increase due to eutrophication in lakes?HardLevel 39Which lake is considered linked with a crater formed by meteorite impact?HardLevel 39Which match is correct for understanding the location of Kolleru Lake?HardLevel 39Vembanad Lake is most associated with which geographical landscape?HardLevel 39What is the most logical reason for seasonal fluctuation in lake water level?HardLevel 39What effect can deforestation in a lake catchment have on the lake?HardLevel 39What can be the most serious combined effect of increasing pollution and siltation in lakes?HardLevel 39What risk increases when population pressure rises around freshwater lakes?HardLevel 39Which cause is most suitable for understanding the origin of glacial lakes?HardLevel 39What is the correct reason for linking lakes with wetland conservation?HardLevel 39In which situation can the economic use of a lake become harmful to the environment?HardLevel 39Which is the correct difference between a coastal lagoon and an inland saline lake?HardLevel 39Why is protecting the catchment area considered a main measure in lake conservation?HardLevel 39What is common between Vembanad and Pulicat lakes?HardLevel 39Fish farming in lakes will be sustainable only under which condition?HardLevel 39What can be the most serious geographical effect of encroachment around lakes?HardLevel 39Why is balancing conservation and economy necessary in the context of Dal Lake?HardLevel 39Which option correctly gives a cause of lake formation and an example?HardLevel 39Which scientific idea explains the moderating effect of lakes on local climate?HardLevel 39If a lake lies in a dry region and its water does not flow out then why can salinity increase in it?HardLevel 39