The Northern Plains

The Northern Plains are formed by river alluvium, so the soil is fertile. Exam tip: connect fertility with river deposition.

Himalayan rivers bring large amounts of sediment and deposit it in the plains. Exam tip: remember both source and deposition.

The deposits of these river systems formed the Northern Plains. Exam tip: link all three river systems with plain formation.

A low gradient reduces river speed and increases deposition. Exam tip: connect gentle slope with meanders and deposits.

Bhabar has coarse and porous deposits, so water percolates downward. Exam tip: remember Bhabar for seepage.

Groundwater reappears in Terai, creating marshy conditions. Exam tip: treat Terai as a wet and marshy belt.

Direct answer: D is correct. Khadar is the newer alluvium found in active floodplains and in low areas close to present river channels. During floods, rivers spread fine silt, sand and clay over these areas. Because fresh sediment can be added repeatedly, Khadar is renewed frequently and is generally fertile. Option D correctly identifies the area most likely to receive new alluvium after floods every year. Option A, Bhangar, is older alluvium on relatively higher terraces and is not renewed annually in the same way. Option B, Bhabar, is a porous, pebbly belt near the Shiwaliks where streams often disappear underground, so it is not the normal answer for annual floodplain deposition. Option C, Terai, is the marshy belt south of Bhabar where streams re-emerge; it may receive water and sediment, but the standard term for newer floodplain alluvium is Khadar. Exam cue: Khadar means new, low, flood-deposited alluvium.

The direct answer is A, Doab. A doab is a fertile tract of land lying between two rivers. The word can be understood as “two waters”: “do” means two and “ab” means water. Rivers deposit fine alluvial soil on their floodplains, so land between rivers is often useful for farming. Step by step: identify the feature as land, notice that it lies between two rivers, and select the geographical term for that land unit, Doab. Option A is correct because it exactly describes this river-bounded tract. Option B, Pass, is a narrow route through mountains or hills, not land between rivers. Option C, Valley glacier, is a moving mass of ice flowing through a mountain valley, not a fertile plain. Option D, Ocean trench, is a very deep depression on the ocean floor, not a landform between rivers. Do not confuse a doab with a valley: a doab is defined by two rivers. Memory cue: “Do” plus “ab” means two waters.

In plains, rivers cut banks and deposit sediments. Exam tip: connect flood plains with lateral river action.

On a gentle slope, a river slows down and forms winding courses. Exam tip: link meanders with slow plain rivers.

An oxbow lake forms when a river meander becomes isolated from the main channel. A meander is a wide bend in a river. Erosion acts more strongly on the outer banks, while deposition occurs on inner banks, gradually narrowing the neck of the bend. During a flood or continued erosion, the neck may be cut through. The river then follows a shorter course, leaving the old curved loop as a separate lake.

Option D is correct because it describes this cut-off process. The new lake often has a curved or horseshoe-like shape and represents an abandoned part of the former river channel. The other options involve mountains, lava, glaciers, or deltas and do not explain oxbow formation. The essential sequence is meander development, neck cut-off, and separation from the active river.

The Brahmaputra carries heavy sediment and shifts channels. Exam tip: link river islands with deposition and braided flow.

Fertile alluvium and water availability support farming and settlement. Exam tip: link population density with resource base.

The Punjab Plain is related to deposits of the Indus river system. Exam tip: connect Punjab with the Indus system.

The Ganga Plain spreads through alluvial deposits between Himalayas and Peninsular region. Exam tip: understand its locational boundary.

Direct answer: Option A, older alluvium where calcium deposits form. Bhangar is the older alluvial terrace of the Northern Plains. It lies above the newer floodplain and is not renewed by every annual flood. In places, calcium carbonate accumulates in the soil and forms hard nodules called kankar. Thus the presence of kankar is a characteristic clue for Bhangar, although its distribution can vary locally. Option A is correct because it links old alluvium with calcium accumulation. Option B is wrong because Bhangar is inland alluvial land, not a newly formed sea coast. Option C is wrong because kankar is not glacial ice; it is a calcareous concretion. Option D is wrong because active lava flow is volcanic material and has a different origin, texture, and composition. Memory cue: Bhangar is old; kankar is its familiar clue.

Floods keep bringing new fertile soil to Khadar. Exam tip: remember Khadar as better for farming.

During floods, rivers deposit more material near banks and form levees. Exam tip: link levees with flood deposition.

Level land helps develop transport and irrigation networks easily. Exam tip: connect level plains with economic development.

Channel shifting and deposition are common in the Brahmaputra Plain. Exam tip: link braided flow with active alluvial plains.

Floods can cause damage but also deposit fertile silt. Exam tip: give a balanced analysis rather than a one-sided answer.

Rivers form deltas by depositing silt and sediments near their mouths. Exam tip: connect delta with deposition at river mouth.

River processes still modify landforms in the plains. Exam tip: connect dynamism with active river action.

Long-term deposition creates thick alluvial layers in the plains. Exam tip: understand the plain as sedimentary filling.

These belts show the internal diversity of the plain. Exam tip: do not treat the Northern Plain as uniform.