The Northern Plains

The direct answer is A: underground water re-emerges at the surface. The Terai lies south of the Bhabar belt. In the porous Bhabar, streams and underground water often disappear into coarse pebbles. Farther south, the finer and less permeable Terai material prevents easy downward movement, so the water comes back to the surface. This creates wet, marshy, and sometimes waterlogged conditions. Option A is correct because it describes this underground-to-surface water movement. Option B is wrong because desert-wind deposition is associated with arid regions, not the main explanation for Terai marshes. Option C is wrong because broken lava rocks do not explain the Terai’s characteristic wetness. Option D is wrong because direct glacier melting is not the defining process there. Memory cue: Bhabar absorbs water; Terai brings it back.

Rivers deposit fresh alluvium in flood plains which increases fertility. In exams, connect fertility with alluvium.

A Doab is alluvial land between two rivers. In exams, remember the Ganga-Yamuna Doab as an example.

The water divide near Ambala separates the Indus and Ganga systems. In exams, connect it with the division of plains.

The Punjab Plain was formed by deposits of the tributaries of the Indus system. In exams, link it with the Indus system.

The Ganga Plain mainly spreads across Uttar Pradesh, Bihar and West Bengal. In exams, treat it as a major part of the central northern plain.

Shifting Brahmaputra channels cause floods and river islands. In exams, remember unstable channels as a feature of the Brahmaputra Plain.

Kankar in Bhangar consists of calcareous nodules in old alluvium. In exams, remember kankar as an identifier of Bhangar.

Floods bring fresh silt to Khadar and make the soil fertile. In exams, identify Khadar with new alluvium.

Level land, fertile alluvial soil and water have promoted settlement. In exams, link population with agriculture and water.

A gentle slope slows rivers and promotes meanders. In exams, connect gentle plain slope with meanders.

An oxbow lake forms when a meander gets cut off. In exams, remember it as a common floodplain river feature.

Flood plains form through river overflow and deposition. In exams, treat them as active surfaces of fluvial deposition.

Himalayan rivers brought and deposited huge sediments over a long period. In exams, link thick alluvium with long-term deposition.

The Northern Plains were mainly formed by deposits of the Indus, Ganga and Brahmaputra systems. In exams, treat these three as the base.

The width varies due to differences in river deposition and relief. In exams, do not treat it as a uniform belt.

Rivers descending from the Shiwalik deposit coarse sediments in the foothill zone. In exams, link Bhabar with Himalayan foothills.

In plains, a river erodes one bank and deposits on the other. In exams, connect meanders with lateral erosion.

The Ganga and Brahmaputra bring heavy sediments and form a delta through distributaries. In exams, link delta with sediment deposition.

River branches spread sediments and form alluvial flood plains. In exams, understand branching systems through deposition.

Bhangar is a relatively higher surface of old alluvium. In exams, higher old plain is treated as Bhangar.

The direct answer is A, Khadar. Alluvium is sediment such as fine silt, sand, and clay carried and deposited by a river. In the Northern Plains, newer alluvium is called Khadar. It is usually found in the lower floodplain and may receive fresh sediment when the river overflows each year. Step by step: the river carries particles; flooding slows the water; the particles settle; repeated yearly deposition makes the surface young and renewed. Option A is correct because Khadar means new alluvial soil, commonly renewed by floods. Option B, Bhangar, is older alluvium lying above the active floodplain; it is not freshly deposited every year and may contain kankar nodules. Option C, Bhabar, is a narrow belt near the Shiwalik foothills where coarse pebbles are deposited and streams often disappear underground. Option D, a plateau, is an elevated, relatively level landform, not a flood-deposited plain. Memory cue: Khadar is “new” alluvium; Bhangar is “old” alluvium.

The level surface and alluvial soil make farming diverse in these plains. In exams, link agricultural potential with physical base.

Level plains are favourable for road and rail construction. In exams, connect transport with relief.

Rivers rising from the Himalayas bring sediments and build plains. In exams, link mountain source with plain deposition.