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Social StudiesClass 8CBSE

What is shifting cultivation? What are its disadvantages?

Answer: Shifting cultivation is also known as slash-and-burn cultivation. It is a type of farming activity which involves clearing a land plot by cutting down trees and burning them. The ashes are then mixed with the soil, and crops are grown. After the land has lost its fertility, it is abandoned. The farmers then move to a new place. The disadvantages of shifting cultivation are as follows: Leads to deforestation Loss of fertility of a particular land Leads to soil erosion Burning of trees causes air pollution Insufficient cultivation of crops for a large population.

Social StudiesClass 8CBSE

Name the factors influencing agriculture.

Answer: The factors that influence agriculture include soil, climate, topography, population etc.

Social StudiesClass 8CBSE

What is agriculture?

Answer: Agriculture is a primary activity that includes growing crops, vegetables, fruits, flowers and rearing livestock. Agriculture is a primary activity, as it is connected with the extraction and production of natural resources.

Social StudiesClass 8CBSE

Biotic resources are ………….. 1. Derived from living things 2. Made by human beings 3. Derived from non-living things

Answer:1 Derived from living things

Social StudiesClass 8CBSE

Which one of the following is a human-made resource? 1. Medicines to treat cancer 2. Spring water 3. Tropical forest

Medicine to treat cancer

Social StudiesClass 8CBSE

Which one of the following does NOT make the substance a resource? 1. Utility 2. Value 3. Quantity

Quantity

Social StudiesClass 8CBSE

Why are human resources important?

Answer: Humans as a resource are important because they have the ability to extract value from all other resources. They can make the best use of nature to create more resources, as they have the knowledge, skill and technology to do so. Education and health help in making humans a valuable resource.

Social StudiesClass 8CBSE

State whether the given statement is true or false. If true, give the reasons.

i). Ganga–Brahmaputra plain of India is an overpopulated region. True: River valley and plains offer suitable land for agriculture. Hence, they are densely populated. (ii) Water availability per person in India is declining. True: Increasing population, increasing urbanization, the rising standards of living and the rising demands for food and cash crops are leading to shortages in the supply of freshwater. The shortages are either due to drying up of water sources or water pollution. (iii) Rows of trees planted in the coastal areas to check the wind movement are called intercropping. False: Rows of trees are planted to check the wind movement and protect soil cover. These are called shelterbelts. (iv). Human interference and changes of climate can maintain the ecosystem. False: Climate change and human interferences can cause the loss of natural habitats, and hence destroy the ecosystem.

Social StudiesClass 8CBSE

Match the following. Column A Column B Land use prevent soil erosion Humus narrow zone of contact between the lithosphere, hydrosphere and atmosphere Rock Dams productive use of land Biosphere organic matter deposited on top soil contour ploughing

Column A Column B Land use productive use of land Humus organic matter deposited on top soil Rock Dams prevent soil erosion Biosphere narrow zone of contact between the lithosphere, hydrosphere and atmosphere

Social StudiesClass 8CBSE

Which one of the following methods is most appropriate to check soil erosion on steep slopes? (a) Shelterbelts (b) Mulching (c) Terrace cultivation

Answer: c) Terrace cultivation

Social StudiesClass 8CBSE

Which one of the following is NOT in favour of the conservation of nature? (a) switch off the bulb when not in use (b) close the tap immediately after using (c) dispose poly packs after shopping

Answer: c) Dispose poly packs after shopping

Social StudiesClass 8CBSE

Which one of the following is NOT a factor of soil formation? (a) Time (b) Soil texture (c) Organic matter

Answer: b. Soil Texture

Social StudiesClass 8CBSE

Suggest three ways to conserve water.

Answer: Three main ways to conserve water are: Increasing forest cover and other vegetation to slow the surface runoff Replenishing underground water through rainwater harvesting Reducing the loss of water in irrigation and shifting to less water-intensive methods of agriculture

Social StudiesClass 8CBSE

Name any two steps that the government has taken to conserve plants and animals.

Answer: Two major steps taken by the government to protect and conserve plants, animals and natural vegetation are as follows: National parks, wildlife sanctuaries, biosphere reserves are made to protect our natural vegetation and wildlife. Awareness programmes like social forestry and tree plantation- ‘Vanamahotsava’ are organised to conserve forests, which are a valuable natural resource.

Social StudiesClass 8CBSE

Why is land considered an important resource?

nswer: Land is considered an important resource because it can be put to use for various purposes like agriculture, forestry, mining, building houses, roads and setting up of industries.

Social StudiesClass 8CBSE

Write any two reasons for land degradation today.

Answer: The overuse of chemical fertilizers and deforestation are the two main reasons for land degradation. The growing population and their ever-growing demand has led to large scale destruction of forest cover and arable land and has created a fear of losing this natural resource.

Social StudiesClass 8CBSE

Which are the two main climatic factors responsible for soil formation?

Answer: Two main climatic factors responsible for soil formation are temperature and rainfall, in which rainfall influences the rate of weathering and humus formation.

Social StudiesClass 8CBSE

(vi) Co-operatives: ______________________ and _____________

Answer: Mother Dairy and Anand Milk Union Limited (Amul)

Social StudiesClass 8CBSE

(v) Cottage Industries: ___________ and ________________

Answer: pottery and basket weaving

Social StudiesClass 8CBSE

(iv) Agro-based Industries: ____________ and ____________

Answer: Dairy and Sugar

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