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SubjectsGeography
अपवाह बेसिन और जलग्रहण क्षेत्रों की संकल्पना
In this Class 11 Geography topic from the chapter “Drainage System,” students learn how a drainage basin or catchment is formed and identified. The topic explains the area drained by a river and its tributaries, the role of watershed boundaries, and how rainfall, surface runoff, streams, and relief shape river networks. It also helps students distinguish between a river basin and a catchment area and understand their importance in studying drainage systems and water resources.
TOPIC PRACTICE
Up to 3 questions from this page. Select your focus, then start.
A is correct. An antecedent river existed before uplift and maintains its general course by cutting down as the land rises. A superimposed river first develops on an upper rock cover; after erosion removes that cover, its inherited course continues across the underlying rocks. Neither type is limited to deltas, and superimposed drainage is not necessarily underground or karstic.
A drainage basin is the area from which precipitation collects and flows toward a common outlet, such as a river channel, lake, or sea. Studying it reveals the relationships among rainfall, infiltration, groundwater recharge, surface runoff, stream flow, evaporation, and storage. This makes the basin a practical planning unit: managers can estimate available water, identify flood-prone areas, protect recharge zones, schedule irrigation, and control pollution upstream before it spreads downstream. Option A is correct because it describes the basin’s source-to-outlet flow system. The other options concern astronomy, marine biology, or seismology and do not explain water management.
A drainage basin is the area from which precipitation and surface or subsurface flow drain toward a common river channel, lake or outlet. Its boundary is usually defined by surrounding higher ridges, so managers can examine rainfall input, interception, infiltration, groundwater storage, runoff, erosion, water use and downstream discharge within one connected unit. This makes it practical for planning reservoirs, irrigation, flood control, pollution reduction and conservation, while recognising that groundwater boundaries may sometimes cross the surface divide. Option A gives the central reason. B, C and D are plainly incorrect because a basin is not only ocean, does receive rainfall and is not a cloud.
QUIZ COMPLETE
