{"id":12700,"date":"2020-09-01T15:38:52","date_gmt":"2020-09-01T10:08:52","guid":{"rendered":"https:\/\/kseebsolutions.guru\/?p=12700"},"modified":"2021-07-02T15:03:49","modified_gmt":"2021-07-02T09:33:49","slug":"kseeb-solutions-for-class-7-science-chapter-9","status":"publish","type":"post","link":"https:\/\/kseebsolutions.guru\/kseeb-solutions-for-class-7-science-chapter-9\/","title":{"rendered":"KSEEB Solutions for Class 7 Science Chapter 9 Soil"},"content":{"rendered":"

Students can Download Chapter 9 Soil Questions and Answers, Notes Pdf, KSEEB Solutions for Class 7 Science<\/a>, Karnataka State Board Solutions help you to revise complete Syllabus and score more marks in your examinations.<\/p>\n

Karnataka State Syllabus Class 7 Science Chapter 9 Soil<\/h2>\n

Class 7 Science Soil NCERT Textbook Questions and Answers<\/h3>\n

Tick the most suitable answer the question 1 and 2.<\/span><\/p>\n

Question 1.
\nIn addition to the rock particles, the soil contains.
\ni. air and water
\nii. water and plants
\niii. minerals, organic matter, air and water
\niv. water, air and plants.
\nAnswer:
\niii. minerals, organic matter, air and water<\/p>\n

Question 2.
\nThe water holding capacity is the highest in
\ni. sandy soil
\nii. clayey soil
\niii. loamy soil
\niv. mixture of sand and loam.
\nAnswer:
\nii clayey soil<\/p>\n

Question 3.
\nMatch the items in Column I with those in Column II<\/p>\n\n\n\n\n\n\n\n\n
Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
i. A home for living organisms<\/td>\na. Large particles<\/td>\n<\/tr>\n
ii. Upper layer of the soil<\/td>\nb. All kinds of soil<\/td>\n<\/tr>\n
iii. Sandy soil<\/td>\nc. Dark in colour<\/td>\n<\/tr>\n
iv. Middle layer of the soil<\/td>\nd. Small particles and packed tight<\/td>\n<\/tr>\n
v. Clayey soil<\/td>\ne. Lesser amount of humus<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Answers:
\ni – b,
\nii – c,
\niii – a,
\niv – e,
\nv – d<\/p>\n

Question 4.
\nExplain how soil is formed.
\nAnswer:
\nSoil is formed through the process of weathering.
\nWeathering is a process of physical break-down and chemical decomposition of rocks and minerals near or at the surface of the earth. This physical and chemical decomposition is primarily done by wind, water, and climate as a result of these processes, large rock pieces are converted into smaller pieces and eventually to the soil.<\/p>\n

Question 5.
\nHow is clayey soil useful for crops?
\nAnswer:
\nFollowing are the properties of clayey soil:<\/p>\n

    \n
  1. It has very good water holding capacity.<\/li>\n
  2. It is rich in organic matter.<\/li>\n<\/ol>\n

    For growing crops such as wheat gram and paddy, the soil that is good at retaining water and rich in organic matter is suitable. Therefore, clayey soil having these characteristics are useful for such kind of crops.<\/p>\n

    Question 6.
    \nList the difference between clayey soil and sandy soil.
    \nAnswer:<\/p>\n\n\n\n\n\n\n\n\n\n
    Clayey soil.<\/td>\nSandy soil.<\/td>\n<\/tr>\n
    1. Ratio of fine particles is higher.<\/td>\n1. Ratio of large particles is higher.<\/td>\n<\/tr>\n
    2. Soil retains water and becomes sticky and wet.<\/td>\n2. Loose particles, air permeate through the soil.<\/td>\n<\/tr>\n
    3. Suitable for crops like paddy, wheat and gram.<\/td>\n3. Suitable for vegetables, peanuts and cotton cultivation.<\/td>\n<\/tr>\n
    4. Difficult to plough when wet.<\/td>\n4. Dries up easily cannot retain water.<\/td>\n<\/tr>\n
    5. It is heavy in weight.<\/td>\n5. It is light in weight.<\/td>\n<\/tr>\n
    6. Less air is trapped between the particles.<\/td>\n6. More air is trapped between the particles.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Question 7.
    \nSketch the cross-section of soil and label the various layers.
    \nAnswer:
    \nA Vertical section through different layers of the soil is called the soil profile. Each layer differs in feel (texture) colour, depth, and chemical composition. These layers are referred to as horizons.
    \nBedrock
    \n\"KSEEB<\/p>\n

    Question 8.
    \nRazia conducted and experiment in the field related to the rate of percolation. She observed that it took 40 min for 200 mL of water to percolate through the soil sample. Calculate the rate of percolation.
    \nAnswer:
    \nGiven,
    \nAmount of water = 200 mL
    \nPercolation time = 40 min.
    \n\"KSEEB<\/p>\n

    Question 9.
    \nExplain how soil pollution and soil erosion could be prevented.
    \nAnswer:
    \nPrevention of soil Pollution<\/p>\n

      \n
    1. Use manures instead of chemical fertilizers.<\/li>\n
    2. Industrial Waste should be treated before release.<\/li>\n
    3. Avoid the use of polythene and plastic or they should not get mixed in the soil.<\/li>\n<\/ol>\n

      Prevention of soil erosion<\/p>\n

        \n
      1. Afforestation large scale planting in place of cut down forests.<\/li>\n
      2. Avoiding overgrazing of grasslands.<\/li>\n
      3. Use of step – farming in hill regions.<\/li>\n<\/ol>\n

        Question 10.
        \nSolve the following crossword puzzle with the clues given.
        \nAcross
        \n2. Plantation prevents it.
        \n5. Use should be banned to avoid soil pollution.
        \n6. Type of soil used for making pottery.
        \n7. Living organisms in the soil.
        \nDown
        \n1. In desert, soil erosion occurs through.
        \n3. Clay and loam are suitable for cereals like.
        \n4. This type of soil can hold very little water.
        \n5. Collective name for layers of soil.
        \n\"KSEEB<\/p>\n

        Class 7 Science Soil Additional Important Questions and Answers<\/h3>\n

        Question 1.
        \nWhat is Soil? What are its uses?
        \nAnswer:
        \nBreaking down of rocks by the action of wind, water and climate causes the formation of soil The nature of Soil depends upon the rocks from which it has been formed and the type of vegetation that grows in it. The Soil is covered on the top surface of the earth. The mixture of rock particles and humus is called the soil. The uses of soil are many. It provides anchorage to the plants. It is home for many organisms. It supplies water and nutrients to the plants. It is essential for agriculture.<\/p>\n

        Question 2.
        \nDefine Humus.
        \nAnswer:
        \nThe rotting dead matter in the soil is called humus.<\/p>\n

        Question 3.
        \nDefine the Soil profile with the figure.
        \nAnswer:
        \nA Vertical section through different layers of the soil is called the Soil profile. The layers of the Soil are referred to as horizons.
        \n\"KSEEB
        \nThe uppermost horizon is very fertile and provides nutrients to plants. It is a top-soil or A – horizon. The Second layer below this is B-horizon. The third layer is C-horizon below this bedrock which is hard and difficult to dig.<\/p>\n

        Question 4.
        \nWhat are the Different Varieties of Soil?
        \nAnswer:
        \nThere are 3 different varieties of Soil.<\/p>\n

          \n
        1. Sandy Soil.<\/li>\n
        2. Clayey soil and<\/li>\n
        3. Loamy soil.<\/li>\n<\/ol>\n

          Question 5.
          \nDefine loamy Soil & its uses.
          \nAnswer:
          \nThe best topsoil for growing plants is loam. Loamy Soil is a mixture of sand, clay, and another type of soil particle known as silt. Silt occurs as a deposit in river beds. The size of the silt particles is between those of sand and clay. The loamy soil also has humus in it. It has the right water holding capacity for the growth of plants.<\/p>\n

          Question 6.
          \nWhat is percolation? How do you find out the percolation rate of water in the Soil?
          \nAnswer:
          \nThe property of Soil to allow the water to filter though it is called percolation.
          \n\"KSEEB
          \nThe percolation rate can be calculated by the amount of water that should be divided by the time taken to percolation, for eg: 1 kg of soil is taken in a pot or bucket. Put 300 ml of water, if it took 10 minutes to percolete. We can calculate the rate of percolation by using the formula
          \nPercolation rate (ml\/min) amount of water 300 ml
          \n\"KSEEB<\/p>\n

          Question 7.
          \nWhat is meant by alluvial soil? What are its uses?
          \nAnswer:
          \nRivers of north India which flow from the Himalayas bring a variety of materials including Silt, clay, sand, and gravel. They deposit their materials called alluvial Soil, this Soil is very fertile and grow many crops and give a very good yield.<\/p>\n

          Question 8.
          \nHow do you find out the absorption of water by soil?
          \nAnswer:
          \n\"KSEEB
          \nTake a plastic funnel. Take a filter paper (or a piece of newspaper sheet), fold, and place it as shown in the figure. Weigh 50g of dry, powdered soil and pour it into the funnel. Measure a certain amount of water in a measuring cylinder and pour it drop by drop on the soil. You can use a dropper for this purpose. Do not let all the waterfall at one spot.
          \nPour water all over the soil. Keep pouring water till it starts dripping. Subtract the amount of water left in the measuring cylinder from the amount you started with. This is the amount of water retained by the soil. Record your results in your notebook in the following manner:
          \nWeight of soil = 50g
          \nThe initial volume of water in the measuring cylinder = U mL
          \nThe final volume of water in the measuring cylinder = V mL
          \nThe volume of water absorbed by the soil = (U – V)mL
          \nWeight of water absorbed by the soil = (U – V) g
          \n(1 mL of water has a weight equal to 1 g)
          \npercentage of water absorbed
          \n\"KSEEB<\/p>\n

          Question 9.
          \nDraw a neat diagram and label the parts of removing moisture from the soil.
          \nAnswer:
          \n\"KSEEB<\/p>\n

          Question 10.
          \nMatch the following :<\/p>\n\n\n\n\n\n\n\n\n\n
          A<\/td>\nB<\/td>\n<\/tr>\n
          1. Clayey Soil<\/td>\n1. Paddy, Wheat etc.<\/td>\n<\/tr>\n
          2. Alluvial Soil<\/td>\n2. Pots, Statues, Playthings<\/td>\n<\/tr>\n
          3. Loamy & Sand mixed Soil<\/td>\n3. Weathering<\/td>\n<\/tr>\n
          4. Clay<\/td>\n4. Wheat, Grams<\/td>\n<\/tr>\n
          5. Sand<\/td>\n5. Cotton<\/td>\n<\/tr>\n
          6. Wind, Water, Climatic factors are causes of<\/td>\n6. Water and drain quickly<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Answer:
          \n1 – d,
          \n2 – a,
          \n3 – e,
          \n4 – b,
          \n5 – f,
          \n6 – c<\/p>\n

          Question 11.
          \nHow Soil can be classified? Name them.
          \nAnswer:
          \nThe Soil is classified on the basis of the proportion of particles of various sizes. If the soil contains a greater proportion of big particles. It is Sandy soil. If the proportion of fine particles is relatively higher then it is clayey soil. The best topsoil for growing plants is loamy soil.<\/p>\n

          Question 12.
          \nWhat is meant by Weathering?
          \nAnswer:
          \nThe process of breaking down rocks into the soil by wind, water, and climate is called weathering.<\/p>\n

          II. Fill in the blanks :<\/span><\/p>\n

            \n
          1. The earthy fragrance<\/u> of soil after the first rain is always refreshing.<\/li>\n
          2. Soil is composed of distinct layers.<\/u><\/li>\n
          3. A vertical section through different layers of the soil is called the Soil profile.<\/u><\/li>\n
          4. The Soil layers are referred to as horizons.<\/u><\/li>\n
          5. Below the C-horizon, the layer is the bedrock<\/u> which is hard and difficult to dig with a spade.<\/li>\n
          6. The mixture of rock particles and humus is called the Soil.<\/u><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

            Students can Download Chapter 9 Soil Questions and Answers, Notes Pdf, KSEEB Solutions for Class 7 Science, Karnataka State Board Solutions help you to revise complete Syllabus and score more marks in your examinations. Karnataka State Syllabus Class 7 Science Chapter 9 Soil Class 7 Science Soil NCERT Textbook Questions and Answers Tick the most …<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/12700"}],"collection":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/comments?post=12700"}],"version-history":[{"count":0,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/12700\/revisions"}],"wp:attachment":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/media?parent=12700"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/categories?post=12700"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/tags?post=12700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}