Drainage Systems in India

Dendritic pattern looks like branches of a tree. Exam tip: connect it with regions of general slope.

In radial pattern streams flow outward from a high centre. Exam tip: remember highlands like Amarkantak.

In trellis pattern smaller streams join the main stream almost at right angles. Exam tip: link it with structural control.

Rectangular pattern may develop along joints in rocks. Exam tip: connect it with rock structure.

Many Indian rivers drain into the Arabian Sea or Bay of Bengal. Exam tip: remember river direction with final water body.

Ravi is a major tributary of the Indus system. Exam tip: remember Jhelum, Chenab, Ravi, Beas and Satluj together.

Satluj is a major tributary of the Indus river system. Exam tip: connect Satluj with the rivers of Punjab.

The Ganga and its tributaries deposit alluvial soil. Exam tip: connect alluvial soil with fertile plains.

The Yamuna joins the Ganga at Prayagraj. This confluence is known as the Triveni Sangam because the Saraswati is traditionally believed to meet the Ganga and Yamuna there. Devprayag is different: it is where the Bhagirathi and Alaknanda meet to form the Ganga. Exam tip: associate Prayagraj with the Ganga-Yamuna confluence and Triveni Sangam.

The direct answer is D, the Ganga system. Ghaghara is a major tributary of the Ganga, joining the Ganga in the northern plains. A tributary is a smaller river that flows into a larger river. To solve this, identify the river system to which Ghaghara belongs: Ghaghara flows through the Himalayan and northern plain region, receives water from its own smaller streams, and finally joins the Ganga. Therefore it is part of the Ganga drainage system. Option A, the Krishna system, is incorrect because Krishna is a peninsular river of southern India and Ghaghara is not its tributary. Option B, the Narmada system, is incorrect because Narmada flows westward through central India, whereas Ghaghara belongs to the northern Himalayan drainage network. Option C, the Godavari system, is incorrect because Godavari is a separate peninsular river system. Option D is correct because Ghaghara is a left-bank tributary of the Ganga. A useful exam cue is to remember Ghaghara, Gandak and Kosi together as important northern tributaries of the Ganga. Do not confuse a tributary with a river system: the tributary is the smaller river, while the Ganga system includes the main river and its tributaries.

In India this river is known as Brahmaputra. Exam tip: remember Tsangpo in Tibet and Brahmaputra in India.

The Brahmaputra flows in Assam as a wide braided river. Exam tip: connect it with high discharge.

Majuli is a famous river island associated with the Brahmaputra. Exam tip: connect Majuli with Assam and Brahmaputra.

The direct answer is D, Dakshin Ganga, meaning the Ganga of the South. Godavari is a major Peninsular river of India. It rises near Trimbakeshwar in Maharashtra and flows generally eastward to the Bay of Bengal. Because it is the longest river of the Peninsular river system and is very important to the people and agriculture of southern India, it is popularly called Dakshin Ganga. Option A, North Ganga, is not the accepted name of Godavari. Option B, Eastern Yamuna, is not a standard name for it and incorrectly links it with the Yamuna. Option C, Western Indus, is also not a recognized name and incorrectly links it with the Indus. Therefore D is correct. The word Dakshin means south, so the name itself gives a useful clue. Remember: Godavari is called Dakshin Ganga and is the longest Peninsular river.

Krishna flows eastward into the Bay of Bengal. Exam tip: treat Krishna as an east-flowing Peninsular river.

Cauvery flows eastward and forms a delta on the eastern coast. Exam tip: connect Cauvery delta with the Bay of Bengal.

The Narmada flows westward through the Narmada Valley. Exam tip: connect Narmada with its valley and Arabian Sea.

Direct answer: Option B, the Narmada, is correct. The Tapi, also called Tapti, is a major Peninsular river that flows westward into the Arabian Sea. The Narmada also flows westward and enters the Arabian Sea, so these two rivers are commonly learned together. The reasoning is a location-and-direction comparison: Godavari, Cauvery, and Mahanadi generally flow eastward toward the Bay of Bengal, whereas Narmada and Tapi flow westward. Option A is wrong because Godavari is mainly east-flowing. Option B is correct because Narmada shares the westward direction. Option C is wrong because Cauvery flows eastward. Option D is wrong because Mahanadi also flows mainly eastward. Exam cue: among major Peninsular rivers, remember the west-flowing pair Narmada–Tapi.

Mahanadi flows eastward into the Bay of Bengal. Exam tip: remember Mahanadi as an east-flowing river.

The direct answer is D, Rajasthan. The Luni River is mainly associated with the dry desert region of Rajasthan. A river’s association with a state is understood from the area through which it flows and the drainage conditions found there. Luni rises in the Aravalli region and flows through the arid parts of Rajasthan. Because rainfall is low and evaporation is high, its water does not normally form a large perennial river reaching the sea; it may end in a marshy or sandy area. Option A, Kerala, is incorrect because Kerala has short, west-flowing rivers and a humid climate, not the desert drainage setting of Luni. Option B, Assam, is incorrect because Assam is associated with the Brahmaputra and heavy monsoon rainfall. Option C, Punjab, is incorrect because Punjab is associated mainly with the Indus river system and its tributaries. Option D is correct because Luni is the best-known river of Rajasthan’s desert and inland drainage region. The main concept is that inland drainage means water may disappear into sand or a lake instead of reaching the sea. Remember: Luni means Rajasthan’s arid, inland-drainage river. Do not select a state merely because it has rivers; match the river with its physical region.

In inland drainage, a river does not reach the sea; it ends within the land in a lake, marsh, or dry area, where its water may evaporate or seep into the ground. Therefore, option A is correct. A river’s Himalayan origin does not decide whether its drainage is inland, so option B is incorrect. Exam tip: remember the Luni River of Rajasthan as an example of inland drainage.

Himalayan rivers get water from snow and rainfall while Peninsular rivers depend more on monsoon. Exam tip: remember this basic difference.

Seasonal rivers depend more on rainfall. Exam tip: connect Peninsular rivers with seasonal nature.

A distributary flows away from the main river in a delta region. Exam tip: treat it as a final branch of a river.

The catchment area of a river is the area from which water drains toward that river and its tributaries. Rainfall, melting snow, springs, and small streams within this area eventually collect and flow into the main river system. The shape of the land determines the direction of this movement, while surrounding water divides mark the boundary of the area. A catchment therefore supplies water to the river.

This idea is closely related to a drainage basin. The sea-wave option describes a coastal environment, not land supplying a river. A place where a river dries is only one possible part of a basin, and volcanoes are unrelated to the definition. Thus, option A correctly describes the catchment area.