SEBA Class 9 Social Science Chapter 9 Geography of Assam

SEBA Class 9 Social Science Chapter 9 Geography of Assam Solutions English Medium As Per New Edition Syllabus to each chapter is provided in the list so that you can easily browse through different chapters. SEBA Class 9 Social Science Chapter 9 Geography of Assam Question Answer in English and select need one. SEBA Class 9 Social Science Textual Solutions Download PDF.

SEBA Class 9 Social Science Chapter 9 Geography of Assam

SEBA Class 9 Social Science Chapter 9 Geography of Assam Also, you can read the (SCERT) in these sections Solutions by Expert Teachers as per Board of Secondary Education, Assam (SEBA) Guidelines. SEBA Class 9 Social Science Chapter 9 Geography of Assam. Here we have given SEBA Textual Solutions For Class 9 Social Science English Medium.

Geography of Assam

GEOGRAPHY

EXERCISE

1. What are the physiographic divisions of Assam?

Ans: Assam is divided into four major physiographic divisions based on its physical features:

(i) Brahmaputra Valley: This is the most extensive and fertile region of Assam, formed by the alluvial deposits of the Brahmaputra River and its tributaries.

(ii) Barak Valley: Located in the southern part, it is formed by the Barak River and its tributaries.

(iii) Karbi Plateau: This is a highland area with rugged terrain located between the Brahmaputra Valley and the Barail Hills.

(iv) Barail and Southern Hills: These are hilly regions located in the southern boundary of Assam, mostly consisting of the North Cachar Hills and other forest-covered highlands.

2. What are the physiographic regions of the Brahmaputra Valley?

Ans: The Brahmaputra Valley is divided into four physiographic regions:

(i) Northern Foothills: Located near the Arunachal border, formed by alluvial fans and terraces.

(ii) North and South Bank Plains: Flat lands on either side of the river used for agriculture and settlement.

(iii) Floodplain and Char Areas: Low-lying lands formed by river deposition; vulnerable to floods and erosion.

(iv) Southern Foothills: Bordering the Meghalaya and Karbi Anglong hills, these have slightly elevated lands with rich biodiversity.

3. Write four names each of the north-bank and south-bank tributaries of the Brahmaputra river.

Ans: The Brahmaputra River has many tributaries flowing from the north and south:

North-bank tributaries:

(i) Subansiri.

(ii) Jia Bharali.

(iii) Ranganadi.

(iv) Dhansiri (North).

South-bank tributaries:

(i) Burhi Dihing.

(ii) Kopili.

(iii) Digaru.

(iv) Disang.

4. Give a brief description of the Brahmaputra plain region.

Ans: The Brahmaputra plain is an extensive alluvial plain formed by the sedimentation of the Brahmaputra River and its tributaries. It stretches from Sadiya in the east to Dhubri in the west. The plain is very fertile and supports agriculture, especially paddy cultivation. The region is densely populated and houses important cities like Guwahati, Dibrugarh, and Tezpur. It is also frequently affected by floods and erosion due to the dynamic nature of the river.

5. Give a brief description of the floodplain region of the Brahmaputra.

Ans: The floodplain of the Brahmaputra consists of low-lying areas and riverine islands (chars) that are regularly flooded during the monsoon. These areas are made of newer alluvium and are constantly reshaped by the river. Although very fertile, these regions are prone to natural disasters such as floods, erosion, and shifting river courses. Majuli, the world’s largest river island, is part of this region.

6. Write about the geographic location and origin of Majuli.

Ans: Majuli is a large river island situated in the midstream of the Brahmaputra River in Assam. It lies between the Subansiri and Brahmaputra rivers and is located in Majuli district, formerly part of Jorhat. The origin of Majuli can be traced to sediment deposition by the Brahmaputra and its changing course over centuries. It has been facing continuous erosion and floods. In 2016, Majuli was declared a district and holds cultural importance due to the presence of satras established by Srimanta Sankardeva.

7. Write briefly about the boundaries and characteristics of the Barak Valley.

Ans: The Barak Valley lies in the southern part of Assam and comprises the districts of Cachar, Karimganj, and Hailakandi. It is bounded by the Meghalaya plateau in the north, Manipur hills in the east, and Mizoram hills in the south. The region is formed by the Barak River and its tributaries and consists mainly of alluvial plains. It has fertile lands, dense population, and receives heavy rainfall, making it agriculturally productive.

8. Write briefly about the boundaries and characteristics of the Karbi Plateau.

Ans: The Karbi Plateau, located in Karbi Anglong district, lies between the Brahmaputra Valley and the Barail Hills. It is bounded by the Kaziranga National Park in the north and the Naga Hills in the east. The plateau is an extension of the Meghalaya Plateau and consists of hills, forested areas, and valleys. It is known for red soils, scattered tribal settlements, and is rich in biodiversity and minerals.

9. Write briefly the characteristics of the Barail Range and Southern Hills.

Ans: The Barail Range is a series of hills located in the southern boundary of Assam, especially in the Dima Hasao district. These hills are composed of sandstone and shale and have steep slopes. The region includes high ridges, valleys, and dense forests. The Southern Hills are rich in biodiversity and are sparsely populated due to difficult terrain. They play an important role in water catchment and are home to various tribal communities.

10. What is the type of Assam’s climate? Write briefly about its characteristics.

Ans: Assam experiences a sub-tropical monsoon climate that is characterized by high humidity, significant seasonal rainfall, and moderate temperature variations. This type of climate is mainly influenced by the South-West Monsoon winds, geographical location, elevation, and presence of major rivers like the Brahmaputra and Barak.

The important characteristics of Assam’s climate are:

(i) Hot and Humid Summers: Summers in Assam are long and hot, beginning in March and continuing till June. The temperature generally ranges between 25°C to 35°C. Due to high moisture in the air, the weather becomes very humid, making it uncomfortable.

(ii) Heavy Monsoon Rainfall: The state receives heavy rainfall from June to September due to the South-West Monsoon. The average annual rainfall ranges between 1500 mm to 3000 mm, with some hilly regions like Dima Hasao receiving more than 4000 mm. This rain sustains agriculture and dense forests.

(iii) Pre-Monsoon Thunderstorms (Bordoichila): In the months of April and May, Assam experiences sudden thunderstorms locally known as Bordoichila. These storms bring strong winds, lightning, and short heavy showers, sometimes causing damage to crops and property.

(iv) Mild and Pleasant Winters: Winters last from November to February. The temperatures drop but remain mild compared to northern India, rarely going below 8°C. The weather remains dry and cool, making it the most comfortable season.

(v) Post-Monsoon Transition: The months of October and November are marked by gradual reduction in rainfall and transition into winter. The humidity decreases, and the skies clear up.

(vi) Geographical Influence: The hills and valleys of Assam influence localized climate patterns. Hilly areas are cooler and receive more rainfall due to orographic effects, while central plains are warmer and relatively drier.

(vii)Impact on Biodiversity and Agriculture: The climate supports rich biodiversity, with tropical rainforests, wetlands, and diverse flora and fauna. It is also ideal for growing rice, tea, sugarcane, and jute, making agriculture the main livelihood in the state.

Assam’s sub-tropical monsoon climate plays a vital role in shaping the natural vegetation, agriculture, and lifestyle of the people. However, it also brings challenges such as floods, soil erosion, and seasonal waterlogging.

11. What is the main reason behind occurrence of rainfall in Assam during summer season.

Ans: The primary cause of rainfall in Assam during the summer season is the influence of the South-West Monsoon winds. These winds originate from the Indian Ocean and the Bay of Bengal, carrying large amounts of moisture. As these moisture-laden winds move towards Assam, they encounter the Eastern Himalayas and the hills of Meghalaya. When the monsoon winds strike these mountain barriers, they are forced to rise, cool, and condense, leading to heavy orographic rainfall across the Brahmaputra and Barak valleys. This phenomenon is particularly intense between June and September, accounting for about 70% of the state’s total annual rainfall. The abundant summer rainfall supports the cultivation of crops like paddy, tea, and jute, but also causes frequent flooding and soil erosion in the region, significantly shaping Assam’s physical and human geography.

12. Discuss briefly about the geographical factors influencing the climate of Assam.

Ans: Assam’s climate is primarily shaped by its geographic location, topography, and the influence of surrounding water bodies and mountain ranges. Situated just south of the Eastern Himalayas and near the Tropic of Cancer, Assam experiences a humid, sub-tropical monsoon climate. The Himalayan ranges to the north and east act as barriers, blocking cold winds from Central Asia and influencing the path of moisture-laden monsoon winds. The Brahmaputra and Barak rivers, along with numerous wetlands, contribute to the region’s high humidity and frequent rainfall. Variations in altitude also play a crucial role; hill areas are cooler and receive more rainfall compared to the plains. Local winds, such as mountain and valley breezes, further affect temperature and humidity. The interaction of these factors creates significant climatic diversity across Assam, resulting in uneven distribution of rainfall and temperature.

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SEBA Class 9 Social Science Solutions [New Editions Updated]

Sl. No.	CONTENTS
Chapter – 1	Advent of the Europeans into India
Chapter – 2	Growth of Indian Nationalism
Chapter – 3	The Moamoriya Rebellion
Chapter – 4	Burmese Invasion of Assam
Chapter – 5	Beginning of The British Administration in India
Chapter – 6	Change of the Earth’s Surface
Chapter – 7	Atmosphere: Structure, Air Pressure and Wind System
Chapter – 8	Geography of India
Chapter – 9	Geography of Assam
Chapter – 10	Political Parties in India
Chapter – 11	Types or Classification of Government
Chapter – 12	Basic Concepts of Economics
Chapter – 13	Basic Economic Problems