Let the initial volume of water U = 100 mL It acts as a natural habitat for many organisms like earthworm, fungi, bacteria, ants, etc. (c) Accumulation of wastes in the soil generated by human activity which alter the features of soil. Major functions of the soil are: Therefore, we can say that the soil is inseparable part of our life. [NCERT Exemplar; HOTS] It is called the topsoil or the A-horizon. Percolation rate of water in the soil \(=\frac{\text { Volume of water percolated }}{\text { Time taken for percolation }}\) Question 2. Now pour this weighed soil into the filter paper fixed in a funnel. Answer: Question 9. B-horizon is also called as Keep an ice-cube tray at one end of the wooden black. Extra Questions for Class 7 Science NCERT. Sandy soil will absorb less water and allows more water to percolate. Question 3. Answer: 7. (a) shimmers Get the chapter wise Important Questions for Class 9 Science at BYJU'S. 2. Question 1. Question 14. Give reason to support your answer. Question 2. 7. clayey. [NCERT Exemplar; HOTS] then much of the falling rain hits the trees and plants before it hits the soil. (c) Observe the following figure. Question 15. (c) hardness Clay → Silt → Sand → Gravel Observe the following figure and answer the following questions. Question 1. Time taken to percolate =120 min NCERT solutions class 7 science chapter 4 Heat is prepared by expert science teachers as per the latest CBSE syllabus. Answer: Each layer of soil differs in feel (texture), colour, depth and chemical composition. (b) Ant, earthworm, termites, milipede, centipede, etc. Answer: Plant roots firmly bind the soil. Percolation rate (mL/min) [NCERT Exemplar] (c) What are the values shown by Gaurav? 5. There are two components of soil one that comes from living thing and other from non-living thing. It has the right water holding capacity for the growth of plants. Answer: Question 8. 1. (c) The soil component forms various layer one above the other according to the size of soil particle. Question 6. Which soil would have the highest and least percolation rate? [HOTS] Answer: Therefore, the volume of water absorbed by the soil = (U- V) mL = (100 – 60)mL = 40 mL The soil has been categorised into four major groups, i.e. (d) Percolation, Question 7. The absorption rate of water by soil can be calculated by the formula as follows: When we eat such contaminated grains, fruits or vegetables, the pesticides present in them damage our health also. towns and cities have asphalted roads and vast areas of soil are concreted. Write them. Answer: Question 8. 6. Answer: Calculate the absorption rate of water by the soil. (b) condense The removal of upper surface of soil is called soil pollution. Why is there a demand to ban polythene bags? Different soils have different porosity. For cotton, sandy-loam or loam, which drain water easily and can hold plenty of air, are more suitable. What does this figure show? These questions are important for the Annual Exam 2021. Question 4. That is why, there is a demand to ban polythene bags and plastics. Answer: The soil has been categorised into four major groups, i.e. It is non-porous and can produce the soil over a long period of time. Take water from measuring cylinder with the help of a dropper and pour it drop by drop on the soil kept in the funnel. Thus, larger soil surface area is available for rainwater to percolate into the soil easily and recharge the groundwater. Question 5. Class 7 Science Chapter 9 Extra Questions and Answers Soil. [NCERT Exemplar] As a result, rainwater cannot percolate to recharge groundwater and the groundwater level further decreases. Choose from the options below, the habitat (place) where the soil has plenty of water and nutrients. Dripping of water from funnel shows that the soil taken on the filter paper has absorbed the maximum amount of water. Explain. Question 1. Question 10. Name them. In this way, soil erosion is prevented and topsoil layer is preserved for growing more plants. Answer By heating the saturated solution, it becomes unsaturated. The conservation of plants and animals solution PDF is also provided here to help the students not only to clear their doubts easily but also to understand the chapter in an easy and interesting way. 1. inseparable Clayey soil is useful for the crops because. Question 14. (e)-(ii) Percolation rate of water is highest in the sandy soil, while the lowest in the clayey soil. The flowing water further erodes the soil surface aggravating erosion. This layer is generally soft, porous and can retain more water. (c) (ii) and (iii) For cotton, sandy-loam or loam, which drain water easily and can hold plenty of air, are more suitable. The contamination of soil with waste materials especially used polythene bags and plastics, pesticides, fertilisers, acid rain industrial chemical wastes, etc., is called soil pollution. Can we make toys with the soil obtained from a field? Question 18. The calculation can be done as follows: 1. (c) becomes dull Question 8. Humus is the dark brown coloured layer which consists of dead, rotting remains of plants and animals. Question 1. No, it is not a good practice to remove grass and small plants growing in an open, unused field because the plants cover the soil surface. (a) Which is the heaviest rock material? Roots although underground possesses living cells that require oxygen for respiration and production of energy. Question 6. 6. A vertical section through different layers of the soil is called the soil profile. An oxide is acidic and has a pungent odour. 8. These items are baked at high temperature after drying in air and then coloured. Chapter 1: Nutrition in Plants. Take a measuring cylinder and fill it with water. [NCERT Exemplar] (a) Statements (ii) and (iv) are correct with reference to soil while (i) weathering is a slow process of soil formation and (iii) loamy soil consists of sand, clay and silt along with humus. 4. Rainwater gets collected over it to form water table. [HOTS] Whereas water retaining capacity of a soil is described in terms of the amount of water absorbed by a particular type of soil. Soil is ……………….. part of our life. Answer: Answer: Answer: Loamy soil is a mixture of sand, clay and another type of soil particle known as silt. (b) subsoil Question 2. The Diversity in Living Organisms Important Questions have been handpicked by experts at Vedantu and includes all the questions that are likely to be asked in the examinations. All the NCERT Solutions 2020-2021 are also given in Video Format also based on latest NCERT Books 2020-21. Practicing with these NCERT Class 9th Science Extra Questions will improve your knowledge and problem-solving capabilities on science topics and make you feel confident in the … Question 5. (b) to increase size of soil particle Question 2. The soil is said to be inseparable part of our life. There is shimmering of air just above the soil during hot summer day. Note the initial volume of water in the measuring cylinder. Sandy soil will absorb less water than clayey soil because of the large spaces between the soil particles. (c) What are the values shown by Anshul? Which type of soil absorbs more water but allows less wateMo percolate? Choose the correct statements from the above. What causes these bubbles to raise? Answer: (viii) Living organisms are ant and insects. It does not have much humus and is lighter in colour than topsoil. The mass of the soil was found to be 50 g. 100 mL of water was taken in a measuring cylinder and added into the soil sample. [HOTS] Question from very important topics are covered by NCERT Exemplar Class 7.. You also get idea about the type of questions and method to answer in your Class 7th examination. Soil is one of the most important natural resources. Given, Original mass of soil = 200 g Soil has particles of different sizes. Have a glance at the MCQ of Chapter 9 Science Class 7 and cross-check your answers during preparation. Question 17. Therefore, the percentage of water absorbed = \(=\left(\frac{U-V}{50} \times 100\right)=\frac{40}{50} \times 100=80 \% Solving the Respiration in Organisms Multiple Choice Questions of Class 7 Science Chapter 10 MCQ can be of extreme help as you will be aware of all the concepts. Rajasthan is a desert state in India. Question 6. Answer: They absorb oxygen that is present in the spaces between soil particles. 3. To score good marks in class 7 science examinations, students should try to solve the The terms for the above described statements are as follows 2. air, water, living BOOK FREE CLASS ; COMPETITIVE EXAMS. (a) Gravel is the heaviest rock material. non-living components and humus that consists of living organisms like fungi, bacteria, worm, insects, etc. (d)-(ii) [HOTS] Humus helps in making soil Explain. Draw the different horizons of soil. Answer: Why is soil erosion relatively less in dense forests as compared to barren, open fields? [NCERT Exemplar] (a) shimmers. Continuously water-logged soils are disadvantageous for plant growth. In the absence of plants, soil becomes loose. Crops such as wheat are grown in the fine clayey soils, because they are rich in humus and are very fertile. Describe the different type of soil. Below this layer is the bedrock, which is hard and difficult to dig with a spade. Choose the correct answer: Question 1. Percolation rate is measured in unit Name two types of soil present in two fields. Answer: (a) (ii) and (iv) Question 3. If there is vegetation on land. (g)-(iii) Here is the list of Extra Questions for Class 7 Science with Answers based on latest NCERT syllabus prescribed by CBSE. Answer: (a) mL/min \(\begin{array}{l}{\text { Percentage of water absorb }} \\ {\qquad=\frac{\text { Amount of water absorbed (in mL) }}{\text { Amount of soil (in gm) }} \times 100}\end{array}\). 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Answer: We have provided Reproduction in Animals Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Answer: In dense forests, the tree cover (canopy) prevents rainwater from directly falling on the ground/soil. The absorption percentage of water can be calculated by the formula given below (f)-(iv) NCERT based extra questions and answers for CBSE Class 9 Science Chapter 9 - Force and Laws of Motion are provided here. When we perform this activity with different soil samples, we will see that. Yes, soil erosion does not occur easily where the land is covered by vegetation (trees and other plants). So, the streams of water in desert region are not visible even during rainy season. 6. sand, clay, silt, humus (a) silt Answer: Which soil is suitable for cotton? Clay is the ……………….. rock particle. Polythene bags and plastics pollute the soil as they kill the organisms living in the soil. The pots and matkas are then kept for drying for three days. What minerals is the bone matrix rich in? Match the Columns (c) Curiosity to learn and scientific attitude. Answer: Subsoil is rich in minerals and iron oxides. Teacher smiled and explained him that an earthworm living in the soil is very beneficial for farmers. Topsoil contains humus. Soil absorbs water due to its Deserts are made up of sand, thus when the rainwater falls on land, it percolates immediately downwards in the spaces between sand particles. Soil is affected by wind, rainfall, temperature, light and humidity. (b) Humus is the lightest soil component which floats on the water surface. Question 13. (e)-(iii) Paddy requires ……………….. soil to grow. True Answer: (a) mL/min, Question 9. Answer: Some of these pesticides also mix up with the soil in the fields and pollute it. Question 10. Answer: Subjects: Science: Chapter 1: Nutrition in Plants. Erosion of soil is more severe in the barren land. A student visits two types of field and observes that soil from field A has high percolation rate of water, while soil from field B has low percolation rate. How can a farmer convert acidic soil into neutral soil? (a) compactness Clayey and loamy soils are both suitable for growing cereals like wheat and gram. Substance like ……………….. and ……………….. pollute the agricultural soil. Soil contains ……………….., ……………….. and countless ……………….. organisms. Answer: This activity shows that the wind blows the soil on a barren land and may cause soil erosion. (c) A-horizon, Question 5. The uppermost layer of land area of earth, which is a mixture of rock particles and humus is called soil. Answer: 4. slow It provides the nutrients in plants, since the roots of most plants are confined to this layer. No, soil from a field cannot be used to make toys. Give reason for your answer. 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. What is soil erosion? Suppose certain sample takes 120 min for 960 mL water to percolate into the soil. The man digging a pit could dig with ease initially because of the presence of topsoil and subsoil (mainly comprising of humus and nutrients). Read the following statements with reference to soil. Sandy soil is used for making toys. Question 6. \) 6. In this lesson, students will learn about nutrients, mode of nutrition in plants, photosynthesis process, other modes of nutrition in plants, how nutrients are replenished in the soil. (b) Forest, Question 3. Name a plant tissue having dead cells. Does the use of pesticides in agriculture also contribute to the soil pollution? (h)-(v), 2. (b) Topsoil It is made up of slightly bigger rock particles than that of the topsoil. Choose the correct answer: Question 1. Answer: (d) dryness = \(\frac{\text {amount of water(mL)}}{\text {percolation time(min)}}\). Do all types of soil absorb water to the same extent? 3. chemicals, pesticides Soil erosion does not occur easily where the land is covered by vegetation. Free PDF download of Important Questions with solutions for CBSE Class 7 Science Chapter 9 - Soil prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Take a wooden block and place some soil or sand on it. Answer: It supports plant growth by holding the roots firmly and supplying water and nutrients to the plants. This layer is less fertile than topsoil and contains few living organisms. In how many groups the soil has been categorised? (b) Which is the lightest soil component? Question 16. Study through them to save your time before exam and score good marks in Science paper. Explain the term humus that is generally found in the uppermost layer of soil. The two major components of soil are weathered rock particles, i.e. The uppermost horizon is generally dark in colour as it is rich in humus and minerals. Extra Questions for Class 7 Science Chapter 9 Soil with Answers. (c) Why different layers of soil component are formed? Answer: What is soil? Next day, the village head called a meeting of all the villagers and convinced the villagers not to use chemicals and pesticides. excessive use of water depletes the groundwater. 5. smallest Register online for Science tuition on Vedantu.com to score more marks in your examination. (a) Soil has various important component. 1. These MCQ Questions on Soil Class 7 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Question 3. Question … Name it. The roots of small plants are embedded entirely in the topsoil. As a result, even shallow borewells yield water. Question 7. Answer: Sclerenchyma Question 2. Therefore, water percolates differently through different soil. Match the Column I with Column II. Clayey soil will absorb more water but allow less water to percolate. Below the C-horizon unweathered solid rock is found which is called as bedrock. The removal of fertile topsoil by water, wind, or ice is known as erosion. Thus, roots are deprived of oxygen and this affects the plant growth. (b) List some organisms living in soil. Extra questions for all chapters are provided with answers. Rock > gravel > sand > silt > clay. Force and Laws of Motion Class 9 Extra Questions Very Short Answer Questions. Which soil is considered to be the most fertile and used for growing crops? Question 1. The solutions are provided here to help students understand the chapter in an interesting way. = 200 – 170 = 30 g 5. That’s why, it is necessary to ban the use of polythene bags and plastics. (c) Alertness, responsibility and ecofriendly nature. True The soil particles with the decreasing order of their particle sizes can be shown as Silt occurs as a deposit in river beds. Question 5. Question 5. For paddy, soils rich in clay and organic matter, having a good capacity to retain water, are ideal. Free PDF download of Important Questions with solutions for CBSE Class 7 Science Chapter 15 - Light prepared by expert Science teachers from latest edition of CBSE(NCERT) books. (iii) Loamy soil contains only sand and clay. Write about C-horizon. For lentils (masoor) and other pulses, loamy soils, which drain water easily, are required. In towns and cities, generally, the borewells have to be dug very deep to get water as compared to borewells dug in villages. Now keep the funnel (with filter paper) in a beaker. Acids, Bases and Salts Class 7 MCQs Questions with Answers. True … Once the soil gets heated, it cannot be moulded into other form. Answer: Since, paddy requires lot of standing water, therefore it is grown in field B. Solving the Soil Multiple Choice Questions of Class 7 Science Chapter 9 MCQ can be of extreme help as you will be aware of all the concepts. It is the uppermost layer of soil and is usually dark in colour because of the presence of minerals and humus in it. The third layers of soil is the C-horizon, which is made up of small lumps of rocks with cracks and crevices. 1. 5. Do you agree? Draw a diagram to show the different layers of soil. The difference in two reading gives the amount of water retained by the soil. (b) porosity (d)-(vii) So, cutting of trees and deforestation should be prevented and efforts should be made to increase the green areas. The percolation rate varies from soil to other soil. (d) greenary Question 1. Clayey soil and loamy soil are rich in humus and are suitable for growing plants like wheat and gram. Extra Questions for Class 9 Science Chapter 9 Force and Laws of Motion. Answer: Availability of water and minerals in the soil for maximum absorption by roots is in the Answer: Atoms and Molecules Class 9 Extra Questions Very Short Answer Questions. Question 1. Question 3. (b) subsoil, Question 2. (a)-(vi) (ii) Percolation of water is faster in sandy soils. This can be shown by performing an activity. Question 3. Answer: A special kind of soil is used for making matkas and surahis. The moisture content of the soil can be calculated by the formula as follows: For planting rice, which kind of soil would be most suitable? He observed that farmers were using pesticides in their field. True (d) clayey Answer: What is weathering? Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.. Class 7 Science Chapter 9 Extra Questions and Answers Soil (a) water holding capacity, Question 6. Answer: Answer: [HOTS] (c) parent rock Tick the most suitable answer in questions 1 and 2. Answer: Weathering is a natural process by which huge rock is broken down into tiny particles but at a very slow rate. Soil is formed by erosion. Take a plastic funnel and a filter paper. Give reasons. \(=\frac{\text { Amount of water (in } \mathrm{mL} )}{\text { Percolation time (in min) }}=\frac{960 \mathrm{mL}}{120 \mathrm{min}}=8 \mathrm{mL} / \mathrm{min}\) 2. Topsoil, subsoil, bedrock [NCERT Exemplar] It is a fertile soil. Name the climatic factors affecting soil properties. (b)-(viii) Design an activity to show the soil erosion on a barren land. MCQ Questions for Class 7 Science with Answers were prepared based on the latest exam pattern. Take some dry powdered soil and weigh it on a balance. Locate the following zones given as boxed items in figure which shows a diagram of soil profile. Exercise Questions. Baked soil is the heated raw soil which lost its water molecule due to heating and becomes red. Hope the knowledge provided regarding the Soil Class 7 Extra Questions and Answers has helped you to the possible extent. Answer: (d) mL/sec [NCERT Exemplar; HOTS] Answer: The percentage of water in soil will be Answer: Arrange the words given below in decreasing order of their particle size. Answer: It is the uppermost layer of earth’s crust which is blackish-brown in colour. (d) dead Question 11. Cotton is grown in sandy-loam soil. The soil that can be moulded into any shape is The area where, there is a lot of clay in the soil, stagnant water collects above the soil whenever it rains. These MCQ Questions on Respiration in Organisms Class 7 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Take a small battery-operated fan or hair dryer and hold it at the other end of the black near sand so that it blows the sand into the tray. It is a fertile soil. Humus, water, clay, sand and gravel. (c)-(i) Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis. Clayey soil contains clay particles with small amount of humus in it. For aerating the soil enabling air to get into deeper layers of soil. Answer: Antoine L. Lavoiser and Joseph L. Proust. Question 1. Question 11. Be careful that water should not fall at one spot on the soil but should be poured uniformly all over the soil. Answer: What is the ideal soil for paddy? A man digging a pit found that he could dig with ease initially but digging became difficult as he went deeper. Keep pouring water till it starts dripping from the lower end of the funnel. Question 19. Explain through an activity that soil has moisture in it. Question 8. Question 2. These bubbles are caused due to the air present in between the soil particles. Loamy soil is a mixture of sand, clay silt and humus. Answer: Define atomicity. It occurs easily in those areas of land which are not covered by vegetation (trees and other plants) or have very little vegetation. You can refer to NCERT Solutions for Class 7 Science Chapter 5 Acids, Bases and Salts to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. HOTS] Answer: Ozone (O 3) Question 3. Question 13. 3. NCERT Solutions for Class 7 Science. Do you agree? Loamy soil is the most fertile soil and used for growing crops. Answer: Tissues Class 9 Extra Questions Science Chapter 6 Extra Questions for Class 9 Science Chapter 6 Tissues Tissues Class 9 Extra Questions Very Short Answer Questions Question 1. Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. The soil is kneaded along with horse dung to make best quality of raw clay soil. Due to this, the blowing wind and flowing rainwater are not able to carry away topsoil and hence soil erosion does not occur. It contains water and air in it and can be moulded. Question 20. (b) Arrange the following rock particles which occur in soil in the increasing order. Answer: Note the mass of the soil taken. Write the difference between rate of percolation and the amount of water retained. (b) List some substances which pollute the soil. The first part of the syllabus consists of chapter 1: matters in our surroundings, chapter 2: Is matter around us pure, chapter 3: atoms and molecules, chapter 4: structure of the atoms, chapter 5: the fundamental unit of life, chapter 6: tissues and chapter 7: diversity in living organisms. False, soil pollution is when humans introduce harmful objects like polythene bags, plastics, chemicals, water products and pesticides in the soil in a way that causes harm to other living things or destroys soil ecosystem. The removal of fertile topsoil by water, wind or ice is known as soil erosion. The soil particles become loose due to the impact of raindrops and the flow of water carries them away. It supplies water and nutrients to plants. [NCERT Exemplar] Answer: Register online for Science tuition on Vedantu.com to score more marks in your examination. The borewells have to be dug very deep to get water as compared to those in villages because. It is somewhat harder and more compact than the topsoil. Question 10. Answer: We will observe that when the fan blows it causes sand or soil particles to move and these get land in the various compartment of the ice-cube tray. NCERT solutions Class 7 Science Chapter 10 Respiration in Organisms is crucial for the students of 7th standard. In order to make toys, the soil should be clayey. Here you can get NCERT Extra Questions for Class 9 Science with Answers. (b) Substances which pollute the soil are a number of waste products, chemicals, pesticides, polythene bags and plastics. No, it is because different types of soil has different absorbing capacity of water. Which soil is considered to be the most fertile and used for growing crops?

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