Lakes

Lakes store water and work as local water resources. For exams connect lakes with water storage.

In dry regions evaporation reduces water and leaves salts behind. For exams remember Sambhar as a saline lake of Rajasthan.

An oxbow lake forms when a river meander is cut off. For exams connect it with meanders and river plains.

Chilika Lake is a lagoon near the Odisha coast. For exams remember a lagoon as a coastal water body.

Loktak Lake is in Manipur and is famous for phumdis. For exams remember it as a special lake of Northeast India.

Wular Lake is a famous freshwater lake of Jammu and Kashmir. For exams remember its location and water type together.

Siltation can make a lake shallow and reduce water storage. For exams understand siltation as a conservation problem.

Gobind Sagar is an artificial reservoir linked with Bhakra Nangal Dam. For exams keep it as an example of an artificial lake.

Pulicat Lake is a major lagoon lake of the eastern coastal region. For exams connect it with Andhra Pradesh and Tamil Nadu.

Large water bodies can help moderate nearby temperature. For exams remember the environmental importance of lakes.

Dal Lake is famous for tourism and houseboat activities in Srinagar. For exams write tourism under the economic importance of lakes.

Wastewater pollutes lakes and harms organisms. For exams treat pollution control as a main conservation measure.

Kolleru Lake is located in Andhra Pradesh between Krishna and Godavari delta regions. For exams connect it with the eastern coastal plain.

Vembanad is a major lake of Kerala and is linked with the backwater region. For exams remember it among South Indian lakes.

Lonar Lake in Maharashtra is linked with a meteorite impact crater. For exams remember it as a lake of special origin.

Lagoons are near the sea and can also be affected by river or rainwater. For exams remember Chilika as a mixed water lagoon.

Excess nutrients can increase algal growth and reduce water quality. For exams connect eutrophication with lake pollution.

Wular Lake is not in Tamil Nadu but in Jammu and Kashmir. For exams practice lake state matching.

Stored lake water can slowly seep into the ground and support groundwater. For exams connect lakes with water conservation.

Lakes provide food and habitat for many organisms. For exams connect biodiversity with the importance of lakes.

Encroachment can reduce the natural area of a lake. For exams remember shore protection in lake conservation.

Nainital Lake is a famous hill lake of Uttarakhand. For exams connect it with both tourism and state.

Freshwater lakes can be useful for water supply and agriculture. For exams remember the difference between freshwater and saline lakes.

The direct answer is D: changes in rainfall, evaporation, and inflow. Lake water level is controlled by a water balance. In simple terms, water level rises when inputs such as rainfall, streams, rivers, or groundwater are greater than water losses. It falls when evaporation, seepage, water use, or outflow becomes greater than the input. During rainy periods, rainfall and inflow usually increase, so the level rises. During hot or dry periods, evaporation may increase and inflow may decrease, so the level falls. Option A, changing mountain age, is wrong because mountains do not regularly change age in a way that controls seasonal lake levels. Option B, changing Sun size, is wrong because the Sun’s size does not seasonally change in this manner; sunlight may affect evaporation, but the option itself is false. Option C, changing sea colour, is irrelevant and does not determine the lake’s water balance. Option D is correct because it names the actual hydrological factors. Memory cue: lake level equals water coming in minus water going out.

Sambhar Lake is an inland saline lake of Rajasthan. For exams also connect it with salt production.