Drainages Class 9 Notes Geography Chapter 3 - PDF Download





















FAQs on Drainage Class 9 Notes CBSE Geography Chapter 3 (Free PDF Download)
1. Why is drainage essential for crops?
Ans:It is crucial to prepare your soil correctly for the upcoming crops. All the rain which the land receives during the monsoon and the winter season won’t make crops bad. When you have a drainage system on your farm, the soil will be properly aerated. In case you get excess standing water in your farm, it can lead to choking of the crops and making them unusable for the yielding season.
Often, the farm loses tons of soil and gets nutrients that were present in the soil that is essential for crops to grow properly. Also, a proper drainage system can avoid soil erosion. Lastly, with the help of drainage systems, farmers can save excess water, which can then be used during the dry season when there is a shortage of water from natural resources.
2. Different types of drainage systems which one is used for preventing water logging?
Ans: There are different types of drainage systems that are used depending on the situation and location. A well-designed drainage system will address all the issues which might come in the future during heavy rainfall and other disasters.
There are mainly three types of drainage systems: the subsurface, downspout, and slope drainage system. The subsurface drainage system is most common as it is used to prevent waterlogging. They start to deteriorate with time, trees, and roots if the water around them is not cleared out. This clogging of water can quickly kill the plant if the water doesn’t drain properly. With a subsurface, trenches were built underground, and a collector needs to be installed to gather the water in one place, which is coming from the pipes.
3. What are drainage and drainage basins according to Geography of Class 9?
Ans: The term drainage refers to an area of a river system. It is a system where water flows from a higher level to a lower level. A drainage basin is available in an area that is drained by one river system. Small streams of water keep flowing from different directions and they come together to form the main river. This, in turn, drains into a huge water body like a sea or lake. The area that is drained by a single river system is known as a drainage basin.
4. Why does the Himalayan region have the most number of freshwater lakes?
Ans: The Himalayan region has the most number of freshwater lakes. These lakes come from a glacial origin. This means that these freshwater lakes are formed only when glaciers are dug out of a basin that is later filled with snowmelt. Some of the important freshwater lakes in the Himalayan region include the Dal Lake, Barapani, Loktak, Nainital, and Bhimtal. In Jammu and Kashmir, The Wular Lake is one of the largest freshwater lakes in India which was a result of tectonic activity.
5. Which questions and examples are important in Chapter 3 of Geography of Class 9?
Ans: Vedantu provides students with all the important questions and examples for Chapter 3 of Geography of Class 9. Students can access these important examples and questions through revision notes that are provided by Vedantu. Some of the important questions are taken from important topics and concepts from this chapter. These concepts include a definition of drainage, the importance of the drainage system, the Himalayan river system, and many more. Most of the important questions from the examination point of view are taken from the NCERT textbook.
6. How was the Sundarban delta formed?
Ans: When the Ganga river flows eastwards into West Bengal, the river splits into two streams. Out of which one of the streams namely the Bhagirathi-Hooghly, starts to flow southwards through the delta plains and into the Bay of Bengal. This stream water then starts to flow southwards to Bangladesh and is later joined by the Brahmaputra river. The water found downstream is known as Meghna. Hence, water from the Brahmaputra and Ganga rivers flows into the Bay of Bengal and creates a delta known as the Sundarban Delta.
7. What are the underlying concepts of Chapter 3 of Geography of Class 9?
Ans: The third chapter of class 9 Geography is titled 'Drainage'. This is a scoring chapter from the examination point of view. The chapter mainly focuses on the drainage systems of India. India has two main drainage systems. These include the Himalayan River and the Peninsular River. Students can access these concepts with the help of NCERT Solutions. Vedantu provides students with a free PDF of NCERT Solutions that they can download at any point of time. They can also access the same by Vedantu Mobile app.