Lakes

Correct answer: B. They can temporarily store excess water

Lakes can reduce flood intensity by holding excess water for some time. In exams treat storage capacity as the key term.

Correct answer: C. Glacial erosion or glacial deposition

Many Himalayan lakes are linked with glacial action. In exams connect mountain lakes with glaciers and basin shapes.

Correct answer: D. It may help maintain flow by releasing water

Lakes may support river flow by providing water during dry periods. In exams understand the link between seasonal flow and lakes.

Correct answer: A. They can moderate temperature to some extent

Due to the heat capacity of water, lakes can moderate nearby temperature. In exams write climate moderation as a local effect.

Correct answer: B. Because evaporation increases salt accumulation

In closed drainage, water does not flow out and evaporation concentrates salts. In exams link salinity with evaporation and closed basins.

Correct answer: C. They can be habitats for aquatic plants and animals

Lakes provide habitat to aquatic organisms and plants. In exams view lakes as both water resources and habitats.

Correct answer: D. A lagoon is coastal while an oxbow lake forms from a meander

A lagoon forms near coastal barriers and an oxbow lake forms from a river meander. In exams differentiate lakes by origin.

Correct answer: A. The lake may gradually become shallow and turn into a marshy area

Silt deposition reduces lake depth and may lead to marsh formation. In exams link deposition with the life cycle of a lake.

Correct answer: B. Because they can also support local economy and employment

Lakes can increase local employment through activities like boating and tourism. In exams include economic importance too.

Correct answer: C. Crescent shaped or horseshoe shaped

An oxbow lake may be crescent shaped due to an old meander. In exams connect shape with the formation process.

Correct answer: D. It is a famous lagoon lake on the east coast of India

Pulicat is a famous lagoon lake on the east coast. In exams remember it as an example of a coastal lagoon.

Correct answer: A. Kashmir valley and tourism importance

Dal Lake is a famous tourist lake in the Kashmir region. In exams link Dal with Srinagar and tourism.

Correct answer: B. When evaporation is high and external outflow is low

High evaporation and low outflow cause salts to accumulate. In exams understand salinity through water balance.

Correct answer: A. Lakes have the capacity to hold and release water

The direct answer is A, lakes have the capacity to hold and release water. A lake acts like a temporary natural storage basin. Step by step: rain or river water enters the lake; the lake stores part of this water; during heavy flow it can reduce the sudden movement of water, and later water may flow out gradually or support the river. This is why lakes can regulate river flow and sometimes reduce floods or maintain flow in drier periods. Option A is correct because storage and controlled release are the relevant reasons. Option B, lakes always raising the river bed, is not a general function and does not explain regulation. Option C, making all rivers underground, is factually false. Option D, permanently stopping clouds, is impossible and unrelated to river-flow control. The exact effect depends on the lake, its outlet and local conditions, so “control” does not mean complete control. Memory cue: a lake is a water buffer—store now, release later.

Correct answer: B. Coastal lagoon lake

A coastal lagoon may show marine influence because it lies near the sea. In exams link lagoons with the sea coast.

Correct answer: A. The main river leaves the old curved channel and takes a shorter route

When an oxbow lake forms, the river separates from the cut-off meander and takes a shorter route. In exams link it with river straightening.

Correct answer: B. A lake may be natural while a reservoir is usually created by a dam

A lake may be natural or artificial but a reservoir is generally made by a human-built dam. In exams note the human-made and natural difference.

Correct answer: C. Algal growth and oxygen shortage

Excess nutrients can increase algal growth and reduce water quality. In exams understand the link between pollution and eutrophication.

Correct answer: A. It can influence both landscape and human activity

Lakes influence landscape scenery and human uses like tourism. In exams link scenic beauty with economic use.

Correct answer: B. The lake bed will start filling with deposits

Silt brought by a river settles on the lake bed. In exams connect river deposition with decreasing lake depth.

Correct answer: C. It is a large freshwater lake of Kashmir

Wular is a famous large freshwater lake of Kashmir. In exams link Wular with Kashmir and freshwater.

Correct answer: A. They can partly separate coastal water from the sea

Sand bars and barriers can separate coastal water and form lagoons. In exams link coastal lakes with barriers.

Correct answer: A. Boating and aquatic habitat

Boating shows economic use and aquatic habitat shows ecological importance. In exams write examples showing dual importance.

Correct answer: B. Chilika

The direct answer is B: Chilika. A coastal lagoon is a shallow water body near the sea, partly separated from the sea by a sandbar, barrier, or spit, while remaining connected to seawater through an opening or channels. Step by step: coastal waves and sediment create a separating barrier; seawater and freshwater may mix; the enclosed shallow water becomes a lagoon ecosystem; fish, birds, and other organisms use it. Chilika Lake is in Odisha on the eastern coast of India and is a famous brackish coastal lagoon. Option B is correct. Option A, Sambhar, is a famous inland saline lake in Rajasthan, not the expected coastal lagoon here. Option C, Wular, is a large freshwater lake in Jammu and Kashmir and is not a coastal lagoon. Option D, Bhimtal, is a freshwater lake in Uttarakhand, also inland. Remember: Chilika means Odisha coast and lagoon.

Correct answer: A. Excessive water withdrawal and encroachment

Water withdrawal and encroachment can reduce lake area. In exams write human pressure as a cause of lake degradation.