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7th Class Science Soil

  • question_answer1) Why is it necessary to ban the use of polythene bags and plastics?

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  • question_answer2) Can we make toys with the soil obtained from afield?

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  • question_answer3) Name the substances which pollute the soil.

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  • question_answer4) (a) Draw a diagram to show different layers of soil. (b) Define the term humus.  

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  • question_answer5) What kind of soil should be used for making matkas and surahis?

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  • question_answer6) Do all the soils absorb water to the same extent?

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  • question_answer7) Which soil would have the highest and least percolation rate?

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  • question_answer8) Which kind of soil would be most suitable for planting rice?

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  • question_answer9) What is the difference between rate of percolation and the amount of water retained?  

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  • question_answer10) In addition to the rock particles, the soil contains (a) air and water (b) water and plants (c) minerals, organic matter, air and water (d) water, air and plants

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  • question_answer11) The water holding capacity is the highest in (a) sandy soil (b) clayey soil (c) loamy soil (d) mixture of sand and loam

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  • question_answer12) Match the items in Column I with those in Column II.  

      Column I   Column II
    (a) A home for living organisms (i) Large particles
    (b) Upper layer of the soil (ii) All kinds of soil
    (c) Sandy oil (iii) Dark in colour
    (d) Middle layer of the soil (iv) Small particles and packed tight
    (e) Clayey soil (v) Lesser amount of humus
     

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  • question_answer13) Explain how soil is formed.

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  • question_answer14) How is clayey soil useful for crops?

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  • question_answer15) List the differences between clayey soil and sandy soil.

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  • question_answer16) Sketch the cross-section of soil and label the various layers.

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  • question_answer17) Razia conducted an 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.

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  • question_answer18) Explain how soil pollution and soil erosion could be prevented.

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  • question_answer19) Solve the following crossword puzzle with the clues given:  

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    NCERT Solutions - Soil
      15 10



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