Looking for an exam-oriented collection of extra questions and answers for SEBA Class 9 Social Science Geography Chapter 4 (Geography of Assam / অসমৰ ভূগোল) for the 2026–27 academic session? Access thoroughly solved Short Answer Questions (2–3 marks), Long Analytical Questions (4–5 marks), comparative distinction tables, and map-study revision guides. Master high-yield exam topics covering Assam’s geographic location, international and inter-state boundaries, and total geographical area (78,438 sq. km); the three distinct physiographic units (Brahmaputra Valley, Barak Valley, and the Karbi Anglong & Dima Hasao Hill Regions); course, northern and southern tributaries, and sandbars (chars/chaporis) of the mighty Brahmaputra River; the hydrography of the Barak River system; regional climatic variations under the subtropical monsoon regime; major soil classifications (alluvial, hill, and laterite soils); distribution of dense tropical evergreen, semi-evergreen, and sal forest reserves; wildlife habitats and national parks (Kaziranga, Manas, Orang, Nameri, Raimona, Dehing Patkai, Dibru-Saikhowa); and comprehensive evaluations of natural disasters—specifically the recurrent causes, bank erosion impact, and mitigation strategies for annual floods in Assam, formatted strictly according to the Assam Board (SEBA) examination pattern.
Q.1. What is the total geographical area of Assam?
Answer: 78,438 sq. km
Q.2. What type of climate does Assam experience?
Answer: Sub-tropical monsoon
Q.3. Which major river flows through the heart of the Assam plains from east to west?
Answer: Brahmaputra
Q.4. Which is the largest river island in Assam?
Answer: Majuli
Q.5. Which is the smallest inhabited river island in the world located in Assam?
Answer: Umananda
Q.6. What is the state tree of Assam?
Answer: Hollong
Q.7. What is the state animal of Assam?
Answer: One-horned rhinoceros
Q.8. Which national park in Assam is famous worldwide for the one-horned rhinoceros?
Answer: Kaziranga
Q.9. What is the primary cash crop of Assam?
Answer: Tea
Q.10. What is the staple food crop cultivated in Assam?
Answer: Rice
SEBA Class 9 Geography Chapter 4 Extra Questions
Q.11. What is the traditional method of shifting cultivation practiced in the hill areas called?
Answer: Jhum cultivation
Q.12. In which year was the capital of Assam shifted to Dispur?
Answer: 1973
Q.13. What was the capital of undivided Assam before Dispur?
Answer: Shillong
Q.14. Which river basin forms the southern plain of Assam?
Answer: Barak
Q.15. How many major physical divisions are there in Assam?
Answer: Three
Q.16. Name the longest north-bank tributary of the river Brahmaputra in Assam.
Answer: Subansiri
Q.17. Which plateau divides the Brahmaputra Valley and the Barak Valley?
Answer: Barail Range / Karbi-Meghalaya Plateau
Q.18. Which wind brings the maximum rainfall to Assam during summer?
Answer: South-West Monsoon
Q.19. What type of soil is widely found in the floodplains of the Brahmaputra and Barak?
Answer: Alluvial soil
Q.20. Which soil type is predominantly found in the hill areas of Karbi Anglong and Dima Hasao?
Answer: Red soil / Laterite soil
Q.21. How many international borders does Assam share?
Answer: Two (Bhutan and Bangladesh)
Q.22. What is the state bird of Assam?
Answer: White-winged wood duck
Q.23. Which district in Assam is famous for its natural lime and cement factories?
Answer: Dima Hasao
Q.24. What is the local spring storm accompanied by rain called in Assam?
Answer: Bordoisila
Q.25. Which type of natural forest covers the areas with the highest rainfall in Assam?
Answer: Tropical evergreen forest
Geography of Assam Important Questions and Answers 2026-27
Q.26. What term describes the deposit of fine silt and sand on riverbanks during floods?
Answer: Alluvium
Q.27. What are the crescent-shaped lakes formed by abandoned river loops in Assam called?
Answer: Oxbow lakes (Beels)
Q.28. Which is the highest hill range in Assam?
Answer: Barail Range
Q.29. What is the largest wetland/beel in the Barak Valley?
Answer: Sonbeel
Q.30. In which national park of Assam are wild horses (feral horses) found?
Answer: Dibru-Saikhowa National Park
Short Questions and Answers
Q.1. What are the three broad physiographical divisions of Assam?
Answer: The three divisions are:
- The Brahmaputra Valley
- The Barak Valley
- The Karbi Anglong and Dima Hasao Hill Region
Q.2. Mention the latitudinal and longitudinal extension of Assam.
Answer: Assam extends from 2409’N to 2758’N latitudes and from 8942’E to 9601’E longitudes.
Q.3. Name two north-bank and two south-bank tributaries of the Brahmaputra.
Answer:
- North-bank: Subansiri and Manas
- South-bank: Burhi Dihing and Kopili
Q.4. What is Piedmont soil and where is it found in Assam?
Answer: Piedmont soil is formed by coarse gravel, sand, and pebbles brought down from the mountains. It is found along the Himalayan foothill belt in northern Assam.
Q.5. Name four main seasons experienced in Assam.
Answer:
- Pre-monsoon
- Monsoon
- Retreating monsoon
- Dry winter
Q.6. Why is the climate of Assam humid?
Answer: Assam has dense water networks, extensive forest cover, and receives heavy rainfall from the southwest monsoon, keeping moisture levels high throughout the year.
Q.7. What is an oxbow lake (Beel)?
Answer: An oxbow lake is a curved water body formed when a meandering river erodes a shortcut and abandons its old loop.
Q.8. Name any two biosphere reserves in Assam.
Answer:
- Manas Biosphere Reserve
- Dibru-Saikhowa Biosphere Reserve
Q.9. Mention two states carved out of undivided Assam after Independence.
Answer:
- Nagaland (1963)
- Meghalaya (1970/1972)
Q.10. Name two major tree species found in the tropical evergreen forests of Assam.
Answer: Hollong and Nahar.
Q.11. What causes flood problems in the Brahmaputra Valley every year?
Answer: Floods are caused by excessive monsoon rainfall, shallow riverbeds filled with heavy silt, and narrow drainage exits.
Q.12. What are the main characteristics of alluvial soil in Assam?
Answer: Alluvial soil is soft, rich in organic matter, highly fertile, and ideal for growing rice, jute, and mustard.
Q.13. Name the two main river systems of Assam.
Answer:
- The Brahmaputra river system
- The Barak river system
Q.14. What are the constituent hill regions of Assam?
Answer: The hill regions consist of the Karbi Anglong Plateau (East and West) and the Dima Hasao (North Cachar) hills.
Q.15. Name two major tributaries of the Barak river.
Answer:
- Jiri
- Kushiyara
Class 9 Social Science Geography Chapter 4 Extra Q&A SEBA
Q.16. What is the economic significance of bamboo and cane in Assam?
Answer: They provide raw materials for paper mills, cottage industries, handicrafts, and local house building.
Q.17. What is meant by “Char” or “Chapori” in Assam?
CAnswer: hars or chaporis are temporary sandbars and islands formed by the deposition of silt inside the Brahmaputra river channel.
Q.18. Why is tea cultivation well-suited to the slopes of Assam?
Answer: Tea plants require abundant rainfall, warm temperatures, and well-drained fertile acidic soil where water does not stagnate around the roots.
Q.19. Name two wildlife sanctuaries in Assam.
Answer:
- Pobitora Wildlife Sanctuary
- Garampani Wildlife Sanctuary
Q.20. What is the main cause of riverbank erosion in Assam?
Answer: Riverbank erosion is caused by strong water currents during high floods, loose alluvial soil along the banks, and deforestation along river catchments.
Long Questions and Answers (3 Marks Each)
Q.1. Describe the physiographic divisions of the Brahmaputra Valley.
Answer: The Brahmaputra Valley can be divided into three distinct physiographic belts:
- The Northern Foothill Belt: Lies along the foothills of the Himalayas, consisting of gravel, sand, and piedmont soil with dense vegetation.
- The Floodplain and Char Belt: The central active river channel area containing sandbars, river islands (like Majuli), and flood-prone lowlands with fertile alluvium.
- The Southern Foothill and Valley Plain: The flat agricultural plain extending southwards up to the Karbi and Meghalaya plateaus, suitable for paddy and tea cultivation.
Q.2. Write a short note on the climate of Assam.
Answer: Assam enjoys a sub-tropical monsoon climate characterized by high humidity and heavy rainfall.
- Rainfall: The South-West monsoon brings heavy rainfall between June and September, causing recurring floods.
- Temperature: Summers are warm and humid, while winters are mild, pleasant, and dry.
- Pre-monsoon Storms: During April and May, pre-monsoon showers and localized storms (Bordoisila) bring early rain essential for tea bushes and paddy crops.
Q.3. Classify the main types of soils found in Assam.
Answer: The soils of Assam are categorized into four major classes:
- Alluvial Soil: Widely found across the Brahmaputra and Barak plains. It is renewed by annual floods, rich in nutrients, and highly productive.
- Piedmont Soil: Confined to the northern Himalayan foothill zone; coarse and porous in texture.
- Hill Soil (Red Soil): Found along the slopes of Karbi Anglong and Dima Hasao, containing high iron content and suitable for horticulture.
- Laterite Soil: Found in parts of Dima Hasao and southern Karbi Plateau, poor in nitrogen and suitable mainly for scrub and forestry.
Q.4. What is Jhum cultivation? Mention two negative impacts of this practice in Assam.
Answer: Jhum cultivation is a traditional slash-and-burn agricultural method practiced by tribal communities on hill slopes, where forests are cleared and burned for farming and abandoned after a few years.
Two major negative impacts are:
- Severe Soil Erosion: Removal of tree cover allows heavy rainfall to wash away topsoil rapidly.
- Deforestation and Loss of Biodiversity: Repeated burning damages forest cover, destroys animal habitats, and reduces soil fertility.
Q.5. Explain three main causes of recurrent floods in Assam.
Answer:
- Excessive Monsoon Rainfall: Assam and the surrounding hills receive heavy rainfall within a short span of 3 to 4 months.
- Heavy Siltation: Rivers carry large volumes of sand and mud from eroding hills, raising the riverbed and decreasing the carrying capacity of the rivers.
- Topography and Narrow Outlets: The Brahmaputra plain is narrow and flanked by mountains on three sides, forcing runoff from hundreds of tributaries into one main channel.
Assam Board Class 9 Geography Chapter 4 Solved Extra Questions PDF
Q.6. Write a brief note on the Barak Valley plain.
Answer:
- Location and Formation: The Barak Valley is situated in southern Assam and formed by the river Barak and its tributaries (like Jiri, Sonai, and Dhaleswari).
- Districts: It comprises three administrative districts: Cachar, Karimganj, and Hailakandi.
- Physical Nature: It is a narrow plain surrounded by hills on the north, east, and south, featuring fertile alluvial soil, tea estates, and numerous water bodies known locally as beels and haors.
Q.7. Describe the characteristics of Tropical Evergreen Forests in Assam.
Answer:
- Rainfall Requirement: These forests thrive in areas with very high annual rainfall (over 250 cm), such as upper Assam and the foothills.
- Canopy Layers: They display a three-tier canopy structure: tall emergent trees (Hollong, Mekai) at the top, medium shade-loving trees (Nahar) in the middle, and dense shrubs, canes, and bamboos at the ground level.
- Ecology: Trees remain green throughout the year as different species shed leaves at different times, creating rich biodiversity.
Q.8. Mention three important reasons why forest conservation is necessary in Assam.
Answer:
- Preserving Rich Biodiversity: Assam’s forests shelter endangered species like the one-horned rhino, royal Bengal tiger, and pygmy hog.
- Controlling Floods and Soil Erosion: Forest roots bind soil on hill slopes, slowing water runoff and reducing silting in the plains.
- Supporting Livelihoods: Forests supply timber, bamboo, medicinal plants, and firewood, and support ecotourism.
Q.9. Name the five traditional National Parks of Assam and mention one key feature for each.
Answer:
- Kaziranga National Park: A UNESCO World Heritage site globally recognized for the highest population of the one-horned rhinoceros.
- Manas National Park: A UNESCO World Heritage site and Tiger Reserve known for golden langurs and pygmy hogs.
- Nameri National Park: Located in the Himalayan foothills; famous for elephants and the rare white-winged wood duck.
- Orang National Park: Known as the “Mini Kaziranga” for its similar landscape and rhino population.
- Dibru-Saikhowa National Park: A riverine wetland park renowned for feral horses and rare migratory birds.
Q.10. Explain the administrative and political changes that altered the boundaries of Assam after 1947.
Answer:
- Partition (1947): During India’s independence, a large part of the Sylhet district was separated from Assam and merged with East Pakistan (now Bangladesh).
- Reorganization into New States: To meet regional aspirations, distinct hill territories were carved out from Assam into separate states: Nagaland in 1963, Meghalaya in 1970/1972, and Mizoram (initially a Union Territory in 1971).
- Relocation of Capital: With the separation of Meghalaya, Shillong became Meghalaya’s capital, prompting Assam to establish its new administrative capital at Dispur (Guwahati) in 1973.
🌿 Class 9 Social Science Exam Preparation Notice: This page features curated SEBA Class 9 Social Science (Geography Section) Chapter 4: Geography of Assam Extra Questions, Answers & Solutions updated for the 2026–27 academic session. Tailored strictly to target high-frequency descriptive, analytical, and map-oriented questions tested in school unit tests, half-yearly exams, and annual examinations, this revision guide explores beyond standard textbook exercises—providing structured, point-wise evaluations of Assam’s physiographic divisions, tributary dynamics of the Brahmaputra and Barak river systems, soil-forest distributions, and the perennial socio-economic challenges of riverbank erosion and seasonal floods—to guarantee full marks in your 2-mark, 3-mark, and 5-mark exam questions.
💡 Master SEBA Class 9 Geography Chapter Extra Questions:
- Having difficulty structuring a comprehensive 5-mark answer detailing the primary physical and human causes of chronic floods and bank erosion in the Brahmaputra Valley, distinguishing between the physiographic features of the Brahmaputra Valley and the Barak Valley, or explaining the ecological significance of Assam’s seven National Parks? Leave your query in the comments section below!
- Bookmark this page for quick revision of physiographic boundary facts, district headquarters, river tributary lists, and wildlife sanctuary data before your upcoming unit evaluations, half-yearly exams, and final annual examinations.
- Share this link with your classmates and WhatsApp study groups to make Class 9 Social Science regional Assam geography preparation structured, analytical, and high-scoring!