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Class 9 Geography Chapter 3 Previous Year Questions - Drainage
Short Answers Type Questions
Q1. What is the major reason for the non-perennial nature of the peninsular rivers? [2023]
These rivers are non-perennial because they are dependent on rainfall.
Q2. Explain three common features of the Narmada and Tapi rivers. [2023]
The common features of the Narmada and Tapi rivers are as mentioned below:
- Both the rivers flow in rift valleys.
- Both are the only long rivers which flow west.
- Both the rivers make estuaries.
Narmada River
Q3. Describe any three important features of the Mahanadi basin. [2021]
The three important features of the Mahanadi basin are:
- Mahanadi basin covers parts of the states of Chhattisgarh, Jharkhand, Odisha and Maharashtra.
- It rises in the highlands of Chhattisgarh and flows through Odisha to form a delta in the Bay of Bengal. Its length is 860 km,
- Due to the devastating floods that the river causes every year, the Hirakund dam has been built on it.
Q4. What is the difference between a Tributary and a Distributary? [2019]
Long Answers Type Questions
Q1. What are the factors for the formation of patterns within a drainage basin? Which are different types of patterns? Explain how do these patterns develop? [2017]
The main factors for the formation of drainage patterns are as given below :
- The slope of the land.
- Underlying rock structure.
- Climatic conditions of the area.
Different types of patterns are dendritic, trellis, rectangular, and radial patterns.
These patterns develop as mentioned below :
- Dendritic: The dendritic pattern develops where the river channel follows the slope of the terrain. The stream with its tributaries resembles the branches of a tree, thus the name dendritic.
- Trellis: A river joined by its tributaries, at approximately right angles, develops a trellis pattern. This pattern develops where hard and soft rocks exist parallel to each other.
- Rectangular: A rectangular drainage pattern develops on a strongly jointed rocky terrain.
- Radial: A radial pattern develops when streams flow in different directions from a central peak or dome-like structure.
A combination of several patterns may be found in the same drainage basin.
The document Class 9 Geography Chapter 3 Previous Year Questions - Drainage is a part of the Class 9 Course Social Studies (SST) Class 9.
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FAQs on Class 9 Geography Chapter 3 Previous Year Questions - Drainage
| 1. What are the main types of drainage patterns? |  |
Ans. The main types of drainage patterns include dendritic, radial, rectangular, and trellis. Dendritic patterns resemble tree branches and form in regions with uniform rock types. Radial patterns emerge around a central peak, such as a volcano. Rectangular patterns occur in areas with faulted or fractured rocks, while trellis patterns develop in regions with alternating resistant and less resistant rocks.
| 2. How does drainage influence the landscape? | |
Ans. Drainage significantly influences the landscape by shaping landforms through erosion and sediment deposition. Streams and rivers carve valleys, hills, and canyons. The flow of water affects soil formation and vegetation distribution, ultimately impacting ecosystems and human activities in the area.
| 3. What factors affect drainage in a given region? | |
Ans. Several factors affect drainage in a region, including topography, climate, soil type, and land use. Steep slopes can enhance drainage, while flat areas may lead to poor drainage. Climate influences precipitation patterns, affecting water runoff and infiltration rates. Additionally, soil texture and structure play a role in how water is absorbed and retained.
| 4. Why is studying drainage important for agriculture? | |
Ans. Studying drainage is crucial for agriculture as it impacts soil moisture levels, crop health, and yield. Proper drainage prevents waterlogging, which can damage roots and reduce oxygen availability. Understanding drainage patterns helps farmers manage irrigation effectively, ensuring crops receive adequate water without excessive saturation.
| 5. What are the impacts of poor drainage on the environment? | |
Ans. Poor drainage can lead to various environmental issues, including flooding, soil erosion, and water pollution. Waterlogged areas may experience reduced agricultural productivity and altered ecosystems. Additionally, stagnant water can become a breeding ground for pests and diseases, further impacting human health and biodiversity in the region.
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