(a) Mention the importance of earthworm. Collect some soil samples and observe them carefully. Each layer differs in feel (texture), colour, depth and chemical composition. (c) loamy (c) porous 6. and weight of the water absorbed by the soil = (U – V)Q = (100 – 60) g = 40 g (i) Weathering is a very fast process of soil formation. Answer: Also roots of the vegetation bind the soil particles and hold them together. (a) B-horizon Raw soil differs from baked soil. (c) A-horizon (d) Percolation, Question 7. They absorb oxygen that is present in the spaces between soil particles. [NCERT Exemplar] Question 5. This kneaded soil is then placed on the wheel and appropriate shape is given. Percolation rate of water is different in different types of soil. Clayey soil is useful for the crops because. Humus is the dark brown coloured layer which consists of dead, rotting remains of plants and animals. [HOTS] The raw soil is white or dull blackish colored soil. 3. It occurs easily in those areas of land which are not covered by vegetation (trees and other plants) or have very little vegetation. But in barren, open fields, the soil is exposed to the falling rain. We will get the volume of water absorbed by the soil which was taken on filter paper in the funnel. then much of the falling rain hits the trees and plants before it hits the soil. Percolation happens on other soils also but the rate varies from 1 to 30 minutes per inches. The next layer has a lesser amount of humus but more of minerals. But as he digs deeper, he finds it difficult to dig beyond a depth of 5 feet as lower layers are made up of small partially weathered rocks with cracks, crevices and with bedrock which make it hard to dig. 1. So it can be moved by wind and flowing water. A gardener often gently digs up the soil around the roots of garden plants or herbs for following reasons. (a) shimmers. Take a plastic funnel. He observed that farmers were using pesticides in their field. (b) to increase size of soil particle Question 12. It is the uppermost layer of earth’s crust which is blackish-brown in colour. Answer: It is the uppermost layer of soil and is usually dark in colour because of the presence of minerals and humus in it. As a result, even shallow borewells yield water. Do you agree? Time taken to percolate =120 min It is called the topsoil or the A-horizon. towns and cities have asphalted roads and vast areas of soil are concreted. They emptied the water from the bottles, one each, at the same time in the two squares. Answer: Answer: Rainwater gets collected over it to form water table. When all the water has percolated leaving the pipe empty, note the time again. Why is there a ban to demand the polythene bags and plastics. The soil particles become loose due to the impact of raindrops and the flow of water carries them away. Take a plastic funnel and a filter paper. The pots and matkas are then kept for drying for three days. The calculation can be done as follows: Suppose, the mass of the soil taken = 50 g • Question 14. Percolation rate of water is the highest in the the soiland least in the soil tarunika72 is waiting for your help. Polythene bags and plastics pollute the soil as they kill the organisms living in the soil. Crops like wheat and rice can be easily grown in clayey soil. Soil in field A is sandy soil while in field B soil is clayey soil which has low percolation rate and water-logging is seen. Crops like wheat and rice can be easily grown in clayey soil. Let us find out. Boojho and Paheli marked two different squares of 50 cm - 50 cm each, one on the floor of their house and the other on the kutcha (unpaved) road. (d) percolates They also kill the organisms living in the soil. (b) List some substances which pollute the soil. Some of these pesticides also mix up with the soil in the fields and pollute it. • Keep pouring water till it starts dripping from the lower end of the funnel. Describe how clayey soil is useful for crops? Collect samples of clayey, loamy and sandy soils. The use of pesticides should be minimised. (g)-(iii) On heating, water in the soil evaporates, moves up and condenses on the cooler inner walls of the upper part of the boiling tube. It is non-porous and can produce the soil over a long period of time. Weathering is a very ……………….. process. Question 11. The difference in two reading gives the amount of water retained by the soil. The two major components of soil are weathered rock particles, i.e. (a) An earthworm helps in making the rich humus in soil. The percolation rate is the amount of water absorbed by any soil at any given time. The substances which pollute the soil are polythene bags, plastics, waste products, chemicals, pesticides, etc. Therefore, the percentage of water absorbed = (U – V/50 × 100) = 40/50 × 100 = 80% Explain how soil … Clayey soil will absorb more water but allow less water to percolate. Rock > gravel > sand > silt > clay. Note the time when you start pouring water. 9. Sandy soil containing sand particles in them. Major functions of the soil are: Therefore, we can say that the soil is inseparable part of our life. Soil profile can also be seen while digging a well or laying the foundation of a building. Sand particles are quite large. (b) (i) and (iii) In some parts there is clayey soil, in some parts there is loamy soil while in some other parts there is sandy soil. No, soil from a field cannot be used to make toys. It acts as a natural habitat for many organisms like earthworm, fungi, bacteria, ants, etc. Sand particles are quite large and have large spaces between them due to which water can drain quickly through the spaces between the sand particles. Your email address will not be published. Keep an ice-cube tray at one end of the wooden black. False, the soil is formed by the breaking down of jocks by the action of wind, water and climate. Why different layers of soil component are formed? A percolation test (colloquially called a perc test) is a test to determine the water absorption rate of soil (that is, its capacity for percolation) in preparation for the building of a septic drain field (leach field) or infiltration basin.The results of a percolation test are required to properly design a septic system.

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