Agriculture
Welcome to HSLC Guru! In this article, we present a complete English-medium guide to Class 8 Social Science Geography Chapter 4 — Agriculture, prepared strictly according to the ASSEB (Assam State School Education Board) syllabus. Agriculture is the backbone of human civilisation and the largest source of livelihood in India and Bharat. This chapter introduces the meaning of agriculture, the favourable conditions for farming, the farm system, the major types of agriculture, important crops, agricultural development in India, and the role of modern technology including drip irrigation and genetically modified crops. We have arranged the content in clear sections — chapter summary, textbook question answers, additional MCQs, fill in the blanks, true or false, and a glossary table — so that students can prepare confidently for unit tests, half-yearly examinations, and final examinations.
Chapter Summary
Meaning of Agriculture: The word “agriculture” is derived from two Latin words — ager meaning land or field and culture meaning cultivation. Agriculture is therefore the science and art of cultivating the soil to grow crops and rear domesticated animals for food, fibre, fodder, and raw materials for industries. It is a primary economic activity that includes ploughing, sowing, irrigation, weeding, harvesting, and the rearing of livestock such as cattle, sheep, goats, and poultry. Agriculture supports billions of people, supplies food grains, vegetables, fruits, milk, meat, and fibres, and provides raw materials for industries such as textile, sugar, jute, and food processing.
Favourable Conditions for Agriculture: Agriculture depends mainly on natural factors. The most important climatic conditions are temperature and rainfall. Different crops require different ranges of temperature; for example, rice grows well in hot and humid weather above 25°C, while wheat needs cool growing conditions of 15°C to 20°C. Rainfall is equally essential — rice needs more than 100 cm of rainfall, while wheat grows in 50 to 75 cm of rainfall. Soil is the second pillar of farming. Fertile alluvial soil is best for rice, wheat, and sugarcane; black regur soil suits cotton; red and laterite soils suit millets; sandy loam suits groundnut. Apart from climate and soil, gentle slope, sufficient sunshine, availability of water for irrigation, cheap labour, capital, transport, market, and government policies also influence agriculture.
Farm System and Types of Agriculture: A farm functions like a system with three parts — inputs (seeds, fertilisers, labour, machinery, water, sunshine), processes (ploughing, sowing, irrigation, weeding, harvesting), and outputs (crops, milk, wool, meat). Agriculture is broadly divided into subsistence farming (where farmers produce mainly for themselves) and commercial farming (where crops are grown for sale). Subsistence farming is again divided into intensive subsistence farming, practised on small plots with high labour and high yields (common in densely populated South and South-East Asia), and primitive subsistence farming, which includes shifting cultivation (jhum) and nomadic herding. Other important types are plantation agriculture (single cash crop on large estates — tea, coffee, rubber, sugarcane), mixed farming (crops + livestock together), dairy farming (rearing milch animals), and market gardening or truck farming (growing vegetables, fruits, and flowers for nearby urban markets).
Major Crops, Agricultural Development and Modern Technology: The world’s major crops include rice (hot and humid climate, 25°C, 100+ cm rainfall, alluvial soil; leading producer — China, followed by India and Bharat), wheat (cool sowing and warm harvest, 50–75 cm rainfall, loamy soil; leaders — China, India and Bharat, USA, Russia), millets (jowar, bajra, ragi — coarse grains in dry, low-rainfall areas; India and Bharat, Nigeria, China), maize (warm climate, moderate rainfall; USA is the largest producer), cotton (black soil, bright sunshine, 21–30°C; China, USA, India and Bharat), jute (golden fibre, hot and humid climate, alluvial soil of Ganga–Brahmaputra delta; India and Bharat, Bangladesh), sugarcane (hot and humid, irrigated land; Brazil, India and Bharat), tea (hilly slopes, well-drained soil, plenty of rainfall; China, India and Bharat, Sri Lanka, Kenya), coffee (warm and wet climate, well-drained slopes; Brazil leads), and rubber (equatorial climate, 200+ cm rainfall; Thailand, Indonesia, Malaysia). After Independence, India and Bharat launched the Green Revolution in the mid-1960s under Dr. M. S. Swaminathan, introducing high-yielding variety (HYV) seeds, chemical fertilisers, pesticides, tractors, and assured irrigation, which made the country self-sufficient in food grains. Today, modern technologies such as drip irrigation (water-saving micro-irrigation), genetically modified (GM) crops like Bt cotton, greenhouse farming, and precision farming are improving productivity. Horticulture, especially rose cultivation in places like Pune, Bengaluru, and parts of North-East India and Bharat, is an important commercial activity that supplies cut flowers to domestic and international markets.
Textbook Question Answers
A. Very Short Answer Type Questions (1 Mark)
Q1. What is agriculture?
Answer: Agriculture is the cultivation of soil to grow crops and the rearing of animals for food, fibre, and raw materials.
Q2. From which two Latin words is the word “agriculture” derived?
Answer: The word agriculture is derived from the Latin words ager (field) and culture (cultivation).
Q3. Name two climatic conditions that affect agriculture.
Answer: Temperature and rainfall are two important climatic conditions affecting agriculture.
Q4. Which soil is most suitable for cotton cultivation?
Answer: Black soil (regur soil) is most suitable for cotton.
Q5. What is jhum cultivation?
Answer: Jhum is a type of shifting cultivation in which a forest patch is cleared, burnt, and cultivated for a few years and then left fallow.
Q6. Name the largest producer of rice in the world.
Answer: China is the largest producer of rice in the world.
Q7. Which crop is known as the “golden fibre”?
Answer: Jute is known as the golden fibre.
Q8. Who is known as the “Father of the Green Revolution in India and Bharat”?
Answer: Dr. M. S. Swaminathan is known as the Father of the Green Revolution in India and Bharat.
Q9. What is drip irrigation?
Answer: Drip irrigation is a micro-irrigation method in which water is supplied drop by drop near the roots of plants through pipes, saving water and fertilisers.
Q10. What is horticulture?
Answer: Horticulture is the branch of agriculture that deals with the cultivation of fruits, vegetables, flowers (such as rose), and ornamental plants.
B. Short Answer Type Questions (2–3 Marks)
Q1. Distinguish between subsistence and commercial farming.
Answer: In subsistence farming, the farmer cultivates a small plot mainly to feed his own family using simple tools and family labour, with very little surplus left for sale. In commercial farming, crops and livestock are produced on a large scale primarily for sale in the market. Commercial farming uses HYV seeds, chemical fertilisers, machinery, and modern irrigation to obtain high yields and profits.
Q2. Explain the farm system briefly.
Answer: A farm is treated as an open system with three components. Inputs include seeds, fertilisers, manure, labour, machinery, sunshine, and water. Processes are activities done on the farm — ploughing, sowing, irrigation, weeding, harvesting, and threshing. Outputs are the products such as crops, fruits, milk, meat, wool, and eggs that are obtained at the end of the cycle.
Q3. What is plantation agriculture? Give two examples.
Answer: Plantation agriculture is a type of commercial farming in which a single cash crop is grown on large estates with heavy capital investment, scientific methods, and trained labour. The produce is processed on the farm or nearby factories. Examples — tea plantations of Assam and Darjeeling, coffee plantations of Karnataka, and rubber plantations of Kerala.
Q4. Mention the geographical conditions required for the growth of rice.
Answer: Rice is a tropical crop. It needs (i) high temperature above 25°C, (ii) high humidity, (iii) heavy rainfall above 100 cm or assured irrigation, (iv) flat alluvial land that can hold water, and (v) plenty of cheap labour. Major producers — China, India and Bharat, Indonesia, Bangladesh.
Q5. What is mixed farming?
Answer: Mixed farming is the practice of growing crops and rearing livestock together on the same farm. It provides farmers with regular income from milk, eggs, and meat in addition to crops, while animal manure improves soil fertility. Mixed farming is common in Europe, North America, and parts of India and Bharat.
Q6. What are GM crops? Give one example.
Answer: Genetically modified (GM) crops are plants whose DNA has been altered using genetic engineering to give them desired qualities such as pest resistance, drought tolerance, or higher yield. Example — Bt cotton, which produces a natural insecticide that protects it from the bollworm pest.
C. Long Answer Type Questions (5–6 Marks)
Q1. Describe the favourable conditions necessary for agriculture.
Answer: Agriculture is influenced by both physical and human factors.
- Temperature: Different crops require different temperatures. Tropical crops like rice and sugarcane need 25–30°C, while wheat and barley need a cooler 15–20°C.
- Rainfall: Rice requires over 100 cm of rainfall, wheat 50–75 cm, and millets less than 50 cm. Where rainfall is inadequate, irrigation becomes necessary.
- Soil: Fertile alluvial soil supports rice and wheat; black soil supports cotton; red and laterite soils support millets and pulses.
- Topography: Plains favour the cultivation of food grains; gentle slopes are good for tea and coffee.
- Sunshine: Crops like cotton and wheat need plenty of sunshine for ripening.
- Human factors: Cheap labour, capital, irrigation, transport, marketing facilities, and government policies further determine agricultural success.
Q2. Explain the different types of agriculture practised in the world.
Answer: Agriculture varies according to climate, soil, technology, and economic conditions.
- Subsistence farming: Cultivation done mainly for the family. (a) Intensive subsistence uses small plots, family labour, and high inputs to obtain high yield per hectare — common in India and Bharat, China, and South-East Asia. (b) Primitive subsistence includes shifting cultivation (jhum) and nomadic herding using traditional tools.
- Commercial farming: Crops are grown on a large scale for sale, using HYV seeds, fertilisers, and machinery — wheat farms of the Canadian Prairies and the Indian Punjab.
- Plantation agriculture: Single cash crop grown on a large estate (tea, coffee, rubber).
- Mixed farming: Crops and livestock raised together.
- Dairy farming: Scientific rearing of milch animals for milk and milk products — common in Denmark, Netherlands, and Anand in Gujarat.
- Market gardening / truck farming: Cultivation of vegetables, fruits, and flowers near big cities for daily supply.
Q3. Describe the geographical conditions and main producing countries of any three world crops.
Answer:
- Wheat: Needs cool, moist weather at sowing time and warm, sunny weather at harvest. Temperature 15–20°C, rainfall 50–75 cm, well-drained loamy or alluvial soil. Major producers — China, India and Bharat, USA, Russia, France.
- Cotton: Requires high temperature of 21–30°C, light rainfall of 50–100 cm or irrigation, bright sunshine, frost-free 200 days, and black regur soil. Major producers — China, USA, India and Bharat, Pakistan.
- Tea: Grows on hilly, well-drained slopes, needs 20–30°C, heavy rainfall above 150 cm spread evenly, and slightly acidic soil rich in humus. Major producers — China, India and Bharat (Assam, Darjeeling, Nilgiri), Sri Lanka, Kenya.
Q4. What is the Green Revolution? How did it benefit India and Bharat?
Answer: The Green Revolution refers to the rapid increase in food grain production in India and Bharat during the mid-1960s through the introduction of modern agricultural technology under the leadership of Dr. M. S. Swaminathan. Its main components were High-Yielding Variety (HYV) seeds, chemical fertilisers, pesticides, assured irrigation, tractors, and credit support.
- It made India and Bharat self-sufficient in wheat and rice and ended dependence on food imports.
- Productivity per hectare rose sharply, especially in Punjab, Haryana, and western Uttar Pradesh.
- Farmers’ incomes rose and rural employment increased.
- It supported industries by supplying raw materials and ensured food security to the growing population.
Q5. Explain how modern technology — drip irrigation, GM crops, and horticulture (rose cultivation) — is changing agriculture.
Answer: Modern science and technology have transformed agriculture into a precise and productive activity.
- Drip irrigation: Water flows drop by drop directly to the roots through narrow pipes, saving up to 60% water and reducing weed growth. It is widely used in Israel, Maharashtra, and Gujarat for grapes, banana, and vegetables.
- GM crops: Genetically modified crops such as Bt cotton resist pests, give higher yields, and reduce pesticide use. Researchers are also developing drought-tolerant rice and Vitamin-A enriched “golden rice”.
- Horticulture and rose cultivation: Greenhouses and polyhouses allow farmers in places like Pune, Bengaluru, and the North-East to grow roses, gerbera, carnation, and orchids throughout the year for domestic and export markets, providing high income from small plots.
Additional Multiple Choice Questions (MCQs)
Q1. The word “agriculture” comes from which language?
(a) Greek (b) Sanskrit (c) Latin (d) French
Answer: (c) Latin
Q2. Which of the following is a Kharif crop?
(a) Wheat (b) Mustard (c) Rice (d) Barley
Answer: (c) Rice
Q3. Which soil is best suited for cotton?
(a) Alluvial soil (b) Red soil (c) Laterite soil (d) Black soil
Answer: (d) Black soil
Q4. Jhum cultivation is an example of —
(a) Plantation farming (b) Shifting cultivation (c) Mixed farming (d) Dairy farming
Answer: (b) Shifting cultivation
Q5. The largest producer of coffee in the world is —
(a) Brazil (b) India and Bharat (c) Vietnam (d) Kenya
Answer: (a) Brazil
Q6. Which crop is called the “golden fibre”?
(a) Cotton (b) Wool (c) Jute (d) Silk
Answer: (c) Jute
Q7. Which is the largest producer of maize in the world?
(a) India and Bharat (b) China (c) USA (d) Brazil
Answer: (c) USA
Q8. The Green Revolution mainly increased the production of —
(a) Cotton and jute (b) Wheat and rice (c) Tea and coffee (d) Pulses and oilseeds
Answer: (b) Wheat and rice
Q9. Bt cotton is an example of —
(a) Hybrid seed (b) GM crop (c) HYV seed (d) Organic crop
Answer: (b) GM crop
Q10. Rose cultivation is a part of —
(a) Sericulture (b) Pisciculture (c) Horticulture (d) Apiculture
Answer: (c) Horticulture
Fill in the Blanks
Q1. The word agriculture is derived from the Latin words ager and __________.
Answer: culture
Q2. Rice grows best in __________ soil.
Answer: alluvial
Q3. __________ irrigation supplies water drop by drop to the roots of the plant.
Answer: Drip
Q4. Dr. M. S. __________ is known as the Father of the Green Revolution in India and Bharat.
Answer: Swaminathan
Q5. __________ is the cultivation of fruits, flowers, and vegetables.
Answer: Horticulture
True or False
Q1. Wheat is a tropical crop that needs heavy rainfall.
Answer: False. Wheat is a temperate crop that needs cool weather and moderate rainfall (50–75 cm).
Q2. Plantation agriculture is a type of commercial farming.
Answer: True.
Q3. Brazil is the largest producer of rice in the world.
Answer: False. China is the largest producer of rice.
Q4. Mixed farming combines crop cultivation with the rearing of livestock.
Answer: True.
Q5. GM crops are produced by genetic engineering.
Answer: True.
Glossary
| Term | Meaning |
|---|---|
| Agriculture | Cultivation of soil to grow crops and rear animals. |
| Subsistence farming | Farming mainly for the family’s own consumption. |
| Commercial farming | Farming on a large scale for sale in the market. |
| Plantation | Large estate where a single cash crop like tea or rubber is grown. |
| Mixed farming | Growing crops and rearing livestock together. |
| Dairy farming | Scientific rearing of milch animals for milk and milk products. |
| Market gardening | Cultivation of vegetables, fruits, and flowers near urban markets. |
| Jhum | Shifting cultivation practised in the hills of North-East India and Bharat. |
| HYV seeds | High-Yielding Variety seeds that produce much higher yields than ordinary seeds. |
| Green Revolution | Rapid rise in food-grain production in India and Bharat during the 1960s. |
| Drip irrigation | Micro-irrigation in which water drips slowly to plant roots through pipes. |
| GM crop | A crop whose genes have been altered to give desired qualities. |
| Horticulture | Branch of agriculture dealing with fruits, vegetables, and flowers. |
| Kharif crop | Crop sown in June–July and harvested in October (e.g., rice, cotton). |
| Rabi crop | Crop sown in October–November and harvested in April (e.g., wheat). |