The Himalayan Rivers

The Indus rises near Lake Mansarovar in Tibet. Exam tip: connect the Indus source with the Himalayan region.

The stream from the Gangotri glacier is called Bhagirathi. Exam tip: remember Bhagirathi as the initial stream of the Ganga.

Bhagirathi and Alaknanda are two important headstreams of the Ganga system in the Himalayan region. They meet at Devprayag in Uttarakhand. From their confluence onward, the combined river is known as the Ganga. This is why Devprayag has an important place in the geographical description of the river, even though the wider Ganga basin has many other tributaries and reaches.

The correct choice is C, Devprayag. Haridwar, Prayagraj, and Varanasi are important places along the Ganga, but the naming point asked in this question is Devprayag. Prayagraj is known for the confluence of the Ganga, Yamuna, and the traditionally recognised Saraswati, not for the joining of Bhagirathi and Alaknanda. Remember the sequence: Bhagirathi and Alaknanda meet at Devprayag, and the united stream is called the Ganga.

The Ganga leaves the mountains near Haridwar and enters the plains. Exam tip: remember Haridwar as an entry point.

The direct answer is A, the Yamunotri Glacier. The Yamuna begins in the high Himalayas of Uttarakhand, where meltwater from the Yamunotri Glacier and nearby snowy areas forms its upper stream. Step by step: identify the river as the Yamuna; recall its source region; connect that source with Yamunotri; therefore option A is correct. Option A works because Yamunotri is traditionally identified as the source glacier of the Yamuna. Option B, Siachen Glacier, is in the eastern Karakoram and is associated with the Nubra-Shyok river system, not the Yamuna. Option C, Milam Glacier, is associated with the Goriganga system. Option D, Pindari Glacier, gives rise to the Pindar River, a tributary of the Alaknanda, not the Yamuna. Do not confuse a glacier’s name with the name of the river flowing nearby. Memory cue: Yamuna begins at Yamunotri; the repeated “Yamun” sound helps.

Yamuna is one of the most important tributaries of the Ganga. Exam tip: place Yamuna in the Ganga system.

Chambal is a tributary joining the Ganga from the south. Exam tip: connect Chambal with the peninsular highlands.

Answer: A, Assam. The Brahmaputra is one of the major Himalayan river systems. After flowing through Tibet and entering India through Arunachal Pradesh, it flows mainly across Assam, where it is a very important river. Its large valley, tributaries, floods, and fertile alluvial deposits are closely connected with Assam’s geography. A is correct because Assam is the Indian state most strongly associated with the Brahmaputra. B, Rajasthan, is mainly associated with arid and semi-arid regions and does not contain the main course of this river. C, Gujarat, is linked with rivers such as the Narmada, Tapi, and Sabarmati, not the Brahmaputra. D, Kerala, has short west-flowing rivers, but the Brahmaputra does not flow there. Memory cue: “Brahmaputra—Assam” is a key river–state pair; do not confuse it with the Ganga plains or Peninsular rivers.

In Arunachal Pradesh the Brahmaputra is called Dihang. Exam tip: remember the sequence Tsangpo Dihang Brahmaputra.

Dibang and Lohit are tributaries of the Brahmaputra. Exam tip: connect them with the Brahmaputra system.

In Assam the Brahmaputra can flow in many channels. Exam tip: connect Brahmaputra with a braided channel.

Sundarbans is the famous mangrove area of the Ganga Brahmaputra delta. Exam tip: connect delta with Sundarbans.

The direct answer is A, sediment deposition at the river mouth. A delta forms where a river enters a sea or lake, loses much of its speed, and can no longer carry all its load. Sand, silt, and clay settle and accumulate near the mouth. Repeated deposition may divide the river into distributaries and create a roughly triangular, fertile landform. Option A is correct because deposition is the essential process behind the Ganga-Brahmaputra delta. Option B, snow freezing on mountains, may affect river water supply but does not build a delta at the mouth. Option C, desert wind, is unrelated to the river’s mouth and cannot explain this delta. Option D, drying of the sea, is not the normal process; the delta grows mainly because river-borne sediment is deposited. Exam cue: river slows at its mouth, load settles, delta forms.

The direct answer is A, erosion. In the upper course, a Himalayan river flows down a steep mountain slope. Because the height difference and speed are comparatively great, the river cuts its bed and valley, carrying away rock, soil, and sediment. Reasoning chain: upper course means mountains; mountains usually have a steep gradient; a steep gradient gives the river strong downward and forward energy; strong energy produces vertical and lateral erosion. Option A is correct because erosion is the dominant work in the upper course, although transport can also occur. Option B is wrong because deposition is generally more important where the river becomes slower, especially in flatter lower areas; “only” also makes it too absolute. Option C is wrong because sea tides are caused mainly by the gravitational pull of the Moon and Sun, not by river work. Option D is wrong because plains may be developed later through deposition, but the upper course is not defined by only making plains. Exam cue: upper course means steep slope and erosion; lower course means slower flow and more deposition.

Fast flow cuts rocks and forms deep valleys. Exam tip: remember the link between mountains and deep valleys.

In plains the slope is low so river speed decreases. Exam tip: connect low slope with slow flow.

The direct answer is A, a meander. In a plain, the river’s slope becomes gentle and its speed is generally lower than in the mountains. The river then swings from side to side, producing broad winding bends called meanders. Reasoning chain: mountain river enters a flat area; gradient decreases; sideways erosion and deposition act on different banks; bends become larger and more curved; the resulting landform is a meander. Option A is correct because meanders are characteristic winding bends of rivers on relatively level land. Option B, a volcanic cone, is built by lava and volcanic material around a volcano, not by ordinary river flow. Option C, a sand dune, is mainly formed by wind depositing sand, so it is not the best answer for a river landform; the word “only” is also unjustified. Option D, a coral reef, is built by marine coral organisms in suitable warm shallow seas, not by Himalayan river action on plains. Remember: a bend in a river is a meander; if the bend is later cut off, it may become an oxbow lake.

The direct answer is A, an oxbow lake. A meander is a curved bend in a river. As the outer banks are eroded and sediment is deposited on inner banks, the bend can become very narrow at its neck. During a flood or strong flow, the river may cut through the neck and take a straighter route. The abandoned curved loop then becomes a separate water body called an oxbow lake. Option A is correct because it specifically describes a cut-off old river bend. Option B, a lava lake, contains molten volcanic rock in a volcanic crater and is not produced by river-bend cutting. Option C is wrong because an oxbow lake is not defined as a salt-water lake; it is usually a freshwater lake, though its exact water condition can vary. Option D is wrong because a glacial lake is made by glacier erosion or melting, not by a meander being cut off. The sequence to remember is: meander grows, neck is cut, loop is abandoned, oxbow lake forms. This is a common river-landform question.

During floods a river deposits fine sediments on its banks. Exam tip: connect flood plains with river deposition.

After floods sediments deposited along banks can form levees. Exam tip: connect levees with flood deposition.

Himalayan rivers bring silt and sand to form alluvial soil. Exam tip: connect alluvial soil with river deposition.

The Ganga and its tributaries deposit fertile alluvial soil. Exam tip: write alluvial soil as the reason for fertility.

Heavy monsoon rainfall can raise river water levels. Exam tip: connect floods with monsoon and excess water.

Kosi can cause flood problems due to heavy silt and course shifting. Exam tip: connect Kosi with floods.

Gandak is a tributary of the Ganga coming from the Himalayan region. Exam tip: remember Gandak as a northern tributary of Ganga.