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Q.1. State True (T) or False (F).
(i) Plantation prevents soil erosion.
(ii) Sandy soil is used to make pottery.
(iii) Use of polythene should be banned to avoid soil pollution.
(iv) Soil is important for life on the earth.
(v) Each layer of soil is same in feel (texture), colour, depth and chemical composition.
(vi) The loamy soil also has humus in it.
Q.2. Fill in the blanks.
(i) In addition to the rock particles, the soil contains ____,____, ____ and ____.
(ii) The water holding capacity is the highest in ____.
(iii) In desert soil erosion occurs through ____.
(iv) ____ soil can hold very little water.
(v) Soil is of different types: ____, ____ and ____.
(vi) The uppermost horizon is generally dark in colour as it is rich in ____ and ____.
Q.3. Which type of soil is the best for making pots, toys and statues?
Q.4. Why the uppermost horizon is generally dark in colour?
Q.5. Which type of soil is best for growing paddy?
Q.6. Which type of soil retains the highest amount of water and which retains the least?
Q.7. How is clayey soil useful for crops?
Q.8. 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.
Q.9. What are the properties of sandy soil?
Q.10. What is humus?
Q.11. Name some soil pollutants.
Q.12. Which soil horizon has a lesser amount of humus but more of minerals?
Q.13. What kind of soil should be used for making matkas and surahis?
Q.14. Why do air above the soil shimmer on a hot summer day?
Q.15. What is weathering?
Q.16. Which natural resource supports the growth of plants by holding the roots firmly and supplying water and nutrients?
Q.17. Which soil has the highest percolation rate?
Q.18. Wheat are grown in the fine clayey soils. Give reason.
Q.19. What is called soil moisture?
Q.20. What is silt?