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Subjects

Geography

Lakes

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.

Expert · Level 1 · 25 questions

Practice questions

01In which situation can a lake indicate a closed drainage basin?

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02The mixing of saline and freshwater in Chilika Lake can be explained by which geographical condition?

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03How is the combined effect of river erosion and deposition seen in oxbow lake formation?

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04Which water balance supports salt production in Sambhar Lake?

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05What conclusion is correct when Wular Lake is linked with a tectonic depression?

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06If inflow decreases and evaporation increases in a lake what is the most likely result?

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07What long-term problem arises when soil erosion increases in a lake catchment?

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08In eutrophication how can ecological stress in a lake increase?

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09Why is it incomplete to call Loktak Lake's phumdis only islands?

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10What is the role of a sandy barrier in a coastal lagoon?

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11If a lake's natural outlet is blocked and evaporation is high which change is most logical?

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12Why can the risk of sudden outburst of glacial lakes increase?

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13Which lake is correctly linked with freshwater and the Krishna Godavari delta region?

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14Why is dissolved oxygen an important indicator of lake water quality?

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15Under which condition will the risk of biomagnification in lakes increase?

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16What does the term backwater indicate while understanding Vembanad Lake?

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17Under which condition can thermal stratification of lakes be more evident?

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18If the sea mouth of a lagoon lake like Chilika becomes highly blocked what effect may occur?

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19Why can encroachment on lakes increase flood risk?

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20Which lake is most correctly matched with both state and feature?

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21How can excessive spread of water hyacinth affect lake water quality?

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22Why can lake water become unsuitable for agricultural irrigation?

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23Why is control on water withdrawal important for sustainable use of lakes?

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24In which situation can the natural purification system of a lake fail?

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25Which statement most accurately analyses a coastal lake and an inland saline lake?

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