Explain how soil pollution and soil erosion could be prevented. How can a farmer convert acidic soil into neutral soil… A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091. Also, clayey soil is rich in humus and is very fertile. A soil with more percolation rate will hold water for shorter time and vice versa. Download Chapter 9 - Soil of Class 7 NCERT Textbook, This website uses cookie or similar technologies, to enhance your browsing experience and provide personalised recommendations. 1. 3. Answer: Percolation rate of water is highest in the sandy soil, while the lowest in the clayey soil. The water holding capacity is the highest in. 6. Clay and loam are suitable for cereals like. Sketch the cross section of soil and label the various layers. Use should be banned to avoid soil pollution. The rate of percolation can be calculated by using the following formula: The median of the given set of numbers 23, 42, 20, 16, 30 is, A pair of adjacent angles, whose non-common sides are opposite rays, is known a, In the given figure, the supplementary of angle 120° is, A ball of mass m moves with a speed v and strikes with a wall having infinite mass and it returns with same speed then the work done by the ball on th, At rest, an average-sized adult will take up about, Whales and human being both are mammals and respire through lungs, The volume of air in the lungs at the end of maximum expiration is termed as, Oxidation of pyruvate by yeast to produce carbon dioxide and energy and, The part of the plant which takes air from the soil is, Whales are living in the sea and they respire through, The animal that have two respiratory organs is, The part of the nasal cavity where minute unwanted particles are trapped is, The process in which a cell breaks down sugar or other organic compounds to release energy is called, In the cells, breakdown of food takes place with the help of, Each cell of an organism performs various functions and to perform these functions, the cell needs, Important Questions CBSE Class 10 Science. Copyright © 2020 Entrancei. In desert soil erosion occurs through. it is the highest in the sandy soil and least in the clayey soil. 3. By continuing to use our website, you agree to our. Option (ii) i.e., clayey soil is the correct option. UPSC IAS 2020 Exam: Click here to get the Complete 30 Days Study Plan to score high in Prelims. Now, Rate of Percolation = 200 ml/40 minute = 5 ml/minute. This process is called weathering. 011-47340170 . 8. NCERT Solutions for Class 7 Science, Chapter 9 – Soil is available here for download in PDF format. The percolation rate varies from soil to other soil. Hence, clayey soil useful for crops (such as wheat). 7. That is why, percolation rate of water is highest in the sandy soil. Soils with strong aggregates, like those with granular or blocky structures, have a higher infiltration rate than soils with weak structures. Tick the most suitable answer in questions 1 and 2. The nature of any soil depends upon the rocks from which it has been formed and the type of vegetation that grows in it. Given, amount of water = 200 ml, percolation time = 40 minute. Percolation rate is highest in Sandy Soil. all rights reserved. Column I: Column II: (i) A home for living organisms (a) Large particles, (ii) Upper layer of the soil (b) All kinds of soil, (iii) Sandy soil (c) Dark in colour, (iv) Middle layer of the soil (d) Small particles and packed tight, (v) Clayey soil (e) Lesser amount of humus, (i) A home for living organisms (b) All kinds of soil, (ii) Upper layer of the soil (c) Dark in colour, (iii) Sandy soil (a) Large particles, (iv) Middle layer of the soil (e) Lesser amount of humus, (v) Clayey soil (d) Small particles and packed tight. Check NCERT Solutions for Class 7 Science, Chapter 9 – Soil. Which soil would have the highest and least percolation rate? Water retention capacity is low. Calculate the rate of percolation. In addition to the rock particles, the soil contains, (iii) minerals, organic matter, air and water. 9. 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