(b) Removal of top soil during heavy rains or strong winds. So, clayey soil provides much less air to the plant roots which grow in it. This air provides the oxygen required for respiration by the roots of plants and other organisms (which live in soil). Read the following statements and give the appropriate terms for each of them. The sandy soil (having the highest percolation rate) allows the rainwater to reach a well faster and in greater amount. Plantation prevents it. Gardeners gently dig up the soil around the roots of garden herbs (plants) frequently. On a hot summer day, this water of soil evaporates to form water vapour. Note the volume of water taken in the measuring cylinder. Copyright 2020 by Tiwari Academy – A step towards Free Education. Living organism in the soil. Required fields are marked *, (a) If the soil contains greater proportion of big particles, it is called, (b) If the soil contains greater proportion of fine particles, it is called, (c) If the soil contains about the same proportions of large and fine particles, then it is called, It provides good aeration (air) to plant roots, It is not able to trap enough air for the roots of plants, Soil always contains some water in it which is called, When water is poured over soil, then some of it gets absorbed in the soil and the rest passes down the soil. 4. Down(↓): Custom Essay Writing Services: How to Choose the Right One? (a) Weathering (b) Erosion (c) Soil pollution (d) Percolation 6. The clayey soil (having the lowest percolation rate) retains the highest amount of rainwater in it. Place one end of the pipe in the dug up ground and hold it vertically. 4. …………………. Clay particles (being much smaller) pack tightly together leaving little space for air. This exemplar covers questions on layers of soil, types of soil, the role of soil, agricultural practices that aid soil health, water absorption of soil along with day to day importance of soil. 6) Sandy soil provides good aeration (air) to the plant roots and it can be ploughed very easily. We have received your request successfully. Due to this, sandy soil provides much more air to the plant roots. Our counselor will call to confirm your booking. (a) Insecticides The water eventually saturates the underlying rock much like water fills the tiny holes of a sponge. Air is present in the spaces between the soil particles. Pesticide is a soil …………………….. . This layer consists of sand, mud, and rock particles. Therefore, water percolates differently through different soil. These layers are referred to as horizons. 7. The rate of absorption is different for different types of soils. 4)The excess water can also drain out through it easily. (2) Pour the water taken in the measuring cylinder in the pipe slowly from the top end. …………………… Question 5  State the important properties of soil? Which of the following situations – ‘A’ or ‘B’ – is advantageous for absorption of water and minerals? How is clayey soil useful for crops? What is the difference between percolation and water retention???? (c) minerals, organic matter, air and water List the differences between clayey soil and sandy soil. Sketch the cross section of soil and label its various layers. The difference in the mass of soil ‘before and after drying’ will give us the mass of water (or moisture) present in the original mass of soil taken. Download NCERT Solutions Apps 2020-21 of Class 7 all subjects for Offline use. Importance of NCERT Exemplar Solutions for Class 7 Science Chapter 9 Soil. (a) (ii) and (iv) (b) (i) and (iii) (c) (ii) and (iii) (d) (i) and (ii) 4. She has seen truck loads of bricks being taken away for construction of buildings. 2. 3. 6. Due to this, sandy soil cannot be used to make pots ,bricks, toys and statues. Discuss this problem with your parents, teachers and other experts of your area and prepare a report. Choose from the options below the habitat (place) where the soil has plenty of water and nutrients. Which type of soil is suitable for growing cereals like wheat and gram. For easier percolation of water. Water logging takes place in ………………….. soil. We have received your request successfully. Tick ( ) the correct option: 1. 2) Clayey soil is very compact. Are her fears justified? Percolation Rate of Water: Amount of water drained through water in unit time is known as percolation rate of water in soil. 1) Sandy soil contains mainly sand (having large particles with large spaces). 5. Digital NCERT Books Class 7 Science pdf are always handy to use when you do not have access to physical copy. F. Solve the following crossword puzzle with the clues given: Across (→): The process in which water passes down slowly through the soil is called percolation of water. Soil supports the growth of …………………… . (adsbygoogle = window.adsbygoogle || []).push({}); 1. 2. Percolation rate of water in soil: The phenomenon of absorption of water by soil is termed as percolation. (b) If the soil contains greater proportion of fine particles, it is called clayey soil. In addition to the rock particles, the soil contains: (3) For growing lentil (masoor dal) and other pulses, loamy soil which drains water easily, is required. He could not dig beyond a depth of 5 feet. Visit to Discussion Forum to Share Your View with your friends. 4. Soil is an important …………………. The uppermost layer of the earth is known as soil. Which type of soil is suitable for growing cereals like wheat and gram. Type of soil used for making pottery. What is weathering? Each layer differs in feel (texture), colour, depth and chemical composition. मृदा अपरदन को किस प्रकार रोका जा सकता है? 3. It is an important property of the soil. (iii) Loamy soil contains only sand and clay. So, the percolation rate of water is lowest in the clayey soil. Rainfall seeps underground through percolation, where water travels downwards through the tiny spaces between rocks and soil particles. Provide a suitable scientific explanation. Stuck At Home? A man digging a pit found that he could dig with ease initially but digging became difficult as he went deeper.

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