MCQ Questions for Class 7 Science: Ch 9 Soils

MCQ Questions for Class 7 Science: Ch 9 Soils

1. _________ are soils in which more than half of the parent mineral matter is volcanic ash and appear very dark in colour.
(a) Desert soil
(b) Volcanic soil
(c) Alluvial soil
(d) Clayey soil
► (b) Volcanic soil

2. A well-developed soil profile is the result of:
(a) physical process
(b) chemical process
(c) organic process
(d) All of the above
► (d) All of the above

3. Soil contains rock particle and_______.
(a) water and air
(b) water and plants
(c) minerals, organic matter, air and water
(d) water, air and plants
► (c) minerals, organic matter, air and water

4. Of the four distinct layers or sections of soil profile, organic matter is found in:
(a) top soil
(b) second layer from the top
(c) third layer from the top
(d) the bottom layer
► (a) top soil

5. The topmost soil:
(a) is soft
(b) is a porous layer
(c) can retain more water
(d) All of the above
► (c) All of the above

6. Soil best suited for cultivation of wheat, rice and sugarcane is
(a) Alluvial soil
(b) Laterite soil
(c) Mountain soil
(d) None of these
► (a) Alluvial soil

7. Humus refers to the:
(a) top most layer
(b) bottom layer
(c) rotting dead matter in soil
(d) None of these
► (c) rotting dead matter in soil

8. Clay particles are of size
(a) More than 0.004 mm
(b) Less than 0.04 mm
(c) More than 0.02 mm
(d) Less than 0.002 mm
► (d) Less than 0.002 mm

9. ________ does not lead to soil erosion.
(a) Deforestation              
(b) Dense vegetation
(c) Over-grazing               
(d) Winds
► (b) Dense vegetation

10. ‘Khadar’ is another name of
(a) Black soil
(b) Red soil
(c) Desert soil
(d) Alluvial soil
► (d) Alluvial soil

11. Cotton is grown in
(a) Clayey soil
(b) Loamy soil
(c) Laterite soil
(d) Sandy loam soil
► (d) Sandy loam soil

12. ___________ we can see the soil profile.
(a) At the sides of a road on a hill
(b) At steep of river bank
(c) Both the above
(d) None of these
► (c) Both the above

13. Earthworms are called
(a) Natural decomposer
(b) Farmers enemies
(c) Farmers friend
(d) Plant destroyer
► (c) Farmers friend

14. Soils are classified according to their:
(a) colour and type of mineral content
(b) colour and texture
(c) texture and type of mineral content
(d) colour, texture and type of mineral content
► (b) colour and texture

15. Breaking down of big pieces of rock into smaller pieces is called
(a) Soiling
(b) Mounding
(c) Weathering
(d) Curving
► (c) Weathering

16. Soil erosion is a process of
(a) Soil formation
(b) Soil pollution
(c) Weathering
(d) Removal of top soil
► (d) Removal of top soil

17. Laterite soil is not found in
(a) Bihar
(b) Haryana
(c) Rajasthan
(d) Uttar Pradesh
► (c) Rajasthan

18. Red soil In which horizon of soil weathering is taking place?
(a) C-horizon.
(b) O-horizon
(c) B-horizon
(d) A-horizon
► (b) O-horizon

19. Dead and decaying material produced by plants in the soil is called
(a) Micro organism
(b) Humus
(c) Khaddar
(d) Fungus
► (b) Humus

20. ________ has the highest water holding capacity.
(a) Sandy soil
(b) Clayey soil
(c) Loamy soil
(d) All of them have same water holding capacity
► (b) Clayey soil

21. __________ should be banned to prevent soil pollution.
(a) Fertilisers
(b) Metals
(c) Plastics
(d) Glass
► (c) Plastics

22. Horizons differ from each other in:
(a) colour
(b) depth
(c) chemical composition
(d) All of the above
► (d) All of the above

23. Which layer is formed of decayed organic matter?
(a) Air
(b) Humus
(c) Clay
(d) Minerals
► (c) Clay

24. Series of layer in soil profile are called
(a) Longitudinal section
(b) Transverse section
(c) Sphere
(d) Horizons
► (d) Horizons
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