Class 9 > Social Studies (SST) Class 9 > Previous Year Questions - Drainage
Previous Year Questions - Drainage - Social Studies (SST) Class 9
Short Answers Type Questions
Q1. What is the major reason for the non-perennial nature of the peninsular rivers? [CBSE 2017]
These rivers are non-perennial because they are dependent on rainfall.
Q2. Explain three common features of the Narmada and Tapi rivers. [CBSE 2017]
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
Tapi River
Q3. Describe any three important features of the Mahanadi basin. [CBSE 2015]
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? [CBSE 2015]
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? [CBSE 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.
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FAQs on Previous Year Questions - Drainage - Social Studies (SST) Class 9
| 1. What is drainage? |  |
Ans. Drainage refers to the process of removing excess water from an area, such as land or buildings, to prevent waterlogging and maintain proper water flow. It involves the construction of channels, pipes, and other systems to collect and redirect water away from the area.
| 2. Why is drainage important? | |
Ans. Drainage is important for several reasons. It helps prevent water accumulation, which can lead to waterlogging and damage to structures, crops, and infrastructure. Proper drainage also helps maintain soil fertility, prevents erosion, and promotes healthy plant growth. It is essential for managing stormwater, reducing the risk of flooding, and maintaining overall environmental sustainability.
| 3. What are the different types of drainage systems? | |
Ans. There are various types of drainage systems, including surface drainage, subsurface drainage, and artificial drainage. Surface drainage involves the use of channels, ditches, or slopes to direct water away from an area. Subsurface drainage uses underground pipes or drains to remove excess water from the soil. Artificial drainage refers to the use of man-made structures, such as sewers or drainage basins, to control water flow.
| 4. How does poor drainage affect agriculture? | |
Ans. Poor drainage can have detrimental effects on agriculture. It can lead to waterlogging, which deprives plant roots of oxygen and nutrients, resulting in stunted growth and reduced crop yields. Excessive water can also cause soil erosion, nutrient leaching, and the spread of waterborne diseases. Additionally, poor drainage can delay planting and harvesting, leading to crop losses and financial losses for farmers.
| 5. What are the methods of improving drainage? | |
Ans. There are several methods to improve drainage, depending on the specific situation. Some common methods include installing surface drains, subsurface drains, or French drains. These systems help collect and redirect excess water. Additionally, grading the land to create slopes and implementing proper soil management practices, such as adding organic matter or improving soil structure, can also enhance drainage. Regular maintenance of drains and clearing of blockages are essential to ensure effective drainage.
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