NCERT Class 7 Science Extra Questions Chapter Soil
1. What are the factors responsible for soil formation? (List some processes of soil formation.)
The soil is formed when rocks crumble due to weathering and natural erosion. The conditions under which soil weathers determine its properties.
The following are some of the most important procedures:
Physical Weathering: Physical factors such as the sun, wind, and ice cause changes in temperature or pressure, or both, which increase or decrease the volume of rocks, causing them to crumble.
When various chemical components, such as rainfall, react with the minerals in the rocks, new minerals or salts are formed.
Biological weathering occurs when living organisms, such as plants, animals, and bacteria, secrete or release acids that corrode the rocks. The foundation aims to support holistic community initiatives in India to address some of the country's most pressing social issues, including health and nutrition, water and sanitation, education, skill development, sustainable livelihoods, and women's empowerment, environment and agriculture, sports, art and culture, rural infrastructure, and social inclusion.
2. Make a list of different soil types.
Soil can be divided into three categories:
Sandy Soil: This type of soil is warm, light, dry, and acidic, with few nutritional components. The diameter of their spheres varies (0.2 mm-2.0 mm). They are also called as light soils because they contain more sand than clay. They're simple to work with and have faster water drainage, so the nutrients are only transported away by rain. Additional organic matter, on the other hand, can aid plant growth.
Clayey Soil: This is a nutrient-rich, heavy soil type. They are moist and chilly in the winter, while they are dry in the summer. There are over 25 clay particles in this soil, and the gaps between them store water. As a result, water drainage is slow, and warming up during the summer takes longer.
Loamy Soil: Loamy soil is a mix of sand and clay that helps to alleviate the negative effects of both. The quantities of sand and clay can be used to regulate water drainage. This soil is easy to work with, which is why gardeners prefer it.
3. Describe some of the functions of soil.
The numerous properties of soil, as well as its quantity of nutrients, minerals, water, and microbes, make it useful in a variety of fields.
Ceramics or pottery are created by combining clay soil and water. It gets its full shape when it has dried. Pottery can be found in the form of vases, bowls, cups, and sculptures.
Cosmetics and pharmaceuticals: Some soil microorganisms are helpful in the fight against harmful bacteria. It's employed in a range of skin ointments, anticancer therapies, and antituberculosis drugs.
Agriculture: Soil not only keeps plants alive, but also provides them with water, oxygen, nutrients, and proper nutrition, allowing them to grow and produce.
Construction: Soil is utilised to make red bricks, which are then used in construction. This dirt has been compacted to improve its density and load-bearing capacity.
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