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Drainage: 9th CBSE Social Science

Question: What is a River System?

Answer: A river along with its tributaries is known as a River System or a Drainage system. Ex. Ganga River System, Indus River System etc.

Question: Define the term drainage.

Answer: The term drainage describes the river system of an area.

Question: What is a drainage basin?

Answer: The area drained by a single river system is called a drainage basin.

Question: What do you understand by the term Water Divide?

Answer: Any elevated area such as a mountain or an upland that separates two drainage basins is called a Water Divide. Ex. Ambala act as a water divide between Indus and Ganga River System.

Question: Define the following:


  1. Drainage Pattern The pattern formed by a river in a drainage basin depending upon the slope of land, rock structure and also climatic condition is referred to as Drainage Pattern.
  2. Perennial Rivers Perennial rivers are those which have water throughout the year. These rivers receive water from rain as well as from melted snow of the mountains. Ex. Ganga, Indus, Brahamaputra.
  3. Seasonal Rivers Seasonal rivers are those which are dependent upon rainfall for their flow. During the dry season, even the large rivers have reduced the flow of water. Ex. Peninsular Rivers like Mahanadi, Godavari, Narmada etc.

Question: What are the two types of drainage systems found in India?

Answer: Himalayan and Peninsular river systems.

Question: Name the rivers that originate from Mansarovar Lake.

Answer: River Indus, Satluj and Brahmaputra

Question:Where the headwaters of Ganga meet at?

Answer: Bhagirathi and Alaknanda meet at Dev Prayag in Uttarakhand.

Question: Where river Ganga leaves behind the mountains and enter the plains?

Answer: Haridwar

Question: Which river flows in Tibet with the name Tsang Po?

Answer: Brahamaputra

Question: What is the source and mouth of the river?

Answer: The place from where the river originates is called as the Source of the river. The place where the river meets its end is known as the Mouth of the river.

Question: Apart from Narmada and Tapi, which are the other west flowing rivers?

Answer: Sabarmati, Mahi, Periyar, Bharathpuzha.

Question: Name the east flowing rivers of India apart from the major ones.

Answer: Damodar, Brahmani, Subarn rekha, Baitarni.

Question:14. Which peninsular rivers flow through a rift valley?

Answer: Narmada and Tapi

Question: Which rivers have the largest river basins in India and in Peninsular India?

Answer: In India: Ganga  In Peninsular India: Godavari

Question: What are the characteristics of river Yamuna?


  1. River Yamuna originates from the Yamunotri glacier of the Himalayas.
  2. It is the largest tributary of river Ganga.
  3. The river moves parallel to Ganga for a long distance and finally meets with Ganga at Allahabad.
  4. Many peninsular rivers join the Yamuna like Chambal, Betwa, Sind etc.

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