The Northern Plains

Correct answer: A. Repeated deposition of new alluvium by rivers

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

Correct answer: B. Sediments from the Himalayas were brought down and deposited by rivers

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

Correct answer: C. Extensive alluvial Northern Plains

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

Correct answer: D. Rivers flow slowly and form deposits and bends

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

Correct answer: A. Because coarse pebbles allow water to percolate downward

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

Correct answer: B. Because water percolated in Bhabar reappears here

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

Correct answer: D. Khadar

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.

Correct answer: A. Doab

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.

Correct answer: B. Lateral river erosion and deposition

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

Correct answer: C. Gentle slope and slow river flow

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

Correct answer: D. A meander neck is cut off and a separate lake forms

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.

Correct answer: A. Heavy deposition and shifting river channels

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

Correct answer: B. Fertile soil, level land and water availability

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

Correct answer: C. Indus and its tributaries

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

Correct answer: A. It is a wide sedimentary zone between Himalayas and Peninsular uplands

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

Correct answer: A. Because it is older alluvium where calcium deposits form

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.

Correct answer: B. Because it has new and repeatedly renewed alluvial soil

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

Correct answer: A. When a river leaves coarse deposits along banks during floods

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

Correct answer: A. It makes expansion of roads, railways and irrigation easier

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

Correct answer: B. An active alluvial plain like the Brahmaputra Plain

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

Correct answer: C. Floods create risk and also bring new alluvial soil

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

Correct answer: A. Deposition of sediments by rivers near the sea

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

Correct answer: A. Because rivers still cause floods, deposition and channel shifting

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

Correct answer: A. In river valleys and sedimentary basins

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

Correct answer: A. The Northern Plain is not completely uniform

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